CN107302180B - Judge automatically and set the control method of laser frequency and power - Google Patents
Judge automatically and set the control method of laser frequency and power Download PDFInfo
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- CN107302180B CN107302180B CN201710442622.3A CN201710442622A CN107302180B CN 107302180 B CN107302180 B CN 107302180B CN 201710442622 A CN201710442622 A CN 201710442622A CN 107302180 B CN107302180 B CN 107302180B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Abstract
The invention discloses a kind of control systems and its control method for judging automatically and setting laser frequency and power.The present invention uses twin-laser structure, and main control unit can search for automatically according to spectral signal and judge automatically the output frequency of main laser, and after the output power to target power of Automatic Optimal main laser, frequency is automatically become locked on atom or molecular spectrum；Beat signal is generated after closing beam from the output of laser and main laser, main control unit can judge automatically the size relation of main laser and the output frequency from laser, to accurate and judge automatically output frequency from laser, after output power to target power of the Automatic Optimal from laser, frequency locking error signal is generated using main control unit, is realized within the scope of 80GHz to the locking from laser frequency；Method of the invention can be widely used in laser cooling, atomic frequency standard, the basic research such as atomic interferometer and laser wavelength meter and Technology of Precision Measurement field.
Description
Technical field
The invention belongs to photoelectron technical fields, and in particular to a kind of control for judging automatically and setting laser frequency and power
System and its control method processed.
Background technique
In the device of the relevant precision measurement equipment of Frequency Stabilized Lasers and application high freuqency accuracy laser, it usually needs
The output frequency of laser is tuned and locked in larger range.The relatively macrorelief of the aging of laser, parameter drift or working environment
Meeting is so that laser frequency drift goes out system lock range, so that the failure or index decline of equipment are caused, if laser has
There is the function of judging automatically simultaneously automatic setpoint frequency, the mean free error time will be substantially increased the index of equipment.
In general, in frequency stabilized carbon dioxide laser or applying in the device of high freuqency accuracy laser, need in larger model
It encloses interior tuning and locks laser frequency.Common method is first to be controlled laser temperature in certain fixation using control temperature unit
Within the scope of (by taking semiconductor laser as an example, the uncertainty general control of temperature is in milli Kelvin/1 hour, corresponding laser
The uncertainty of frequency is 20MHz magnitude), the Injection Current of laser is then adjusted again, so that laser frequency and certain sample (example
Such as atomic air chamber, molecule gas chamber or optical resonator etc.) resonance, detect and handle the spectral signal acquisition error letter that resonance generates
Number, error signal control laser frequency (electric current of controllable laser, resonant cavity length or laser temperature) is recycled, realizes and swashs
The locking (can usually be controlled the uncertainty of laser frequency in 1MHz magnitude after locking) of light frequency.
It being made reference using atom or molecular spectrum, laser frequency can only be locked on the discrete frequency values of several fixations,
If the resonant frequency of required laser frequency and spectral line is inconsistent, need using complicated external modulation device (such as acousto-optic
Modulation or Electro-optical Modulation etc.) laser frequency is adjusted, and external modulation device not necessarily being capable of seamless coverage atom or molecule
All frequencies between spectral resonance frequency.It is made reference using optical resonator, if the optical path difference between resonator mirror is constant,
Laser frequency can only be also locked on the discrete frequency values of several fixations；If cavity length can be tuned, adjust
Humorous precision will have a direct impact on the precision of output laser frequency.In addition, the length of resonant cavity is highly susceptible to environment various factors
Interference (such as variation of ambient temperature, humidity variation, mechanical oscillation etc.), these interference meetings are so that the resonance frequency of chamber occurs
Drift, to influence the output frequency of laser.
When aging meeting is so that laser under the conditions of preliminary set time, reaches the output frequency of system needs, output light
Power decline, generation measuring signal intensity decline so that whole device index decline even fail；Laser parameter becomes
When change or environmental condition are had compared with macrorelief, laser can not be by adjusting Injection Current for laser frequency under original set temperature
Rate, which is adjusted to target value or laser temperature, may not be able to be locked into original setting value, and such equipment can not work normally.
Summary of the invention
In order to solve above-mentioned problems of the prior art, is judged automatically the invention proposes one kind and set laser frequency
The control system and its control method of rate and power can be judged automatically and be locked under the premise of laser itself is without failing
Laser frequency is determined to target value.
An object of the present invention is to provide a kind of control systems for judging automatically and setting laser frequency and power.
The of the invention control system for judging automatically and setting laser frequency and power include: main laser, from laser,
First control temperature unit, the second control temperature unit, the first current unit, the second current unit, the first power detector, the second power are visited
Survey device, saturation-absorption spectrum unit, frequency stabilization unit, high-speed photodetector, frequency divider, the first high reflection light splitting piece, second high
Reflection beam splitting piece, highly transmissive light splitting piece, the first half wave plate, the second half wave plate, quarter-wave plate, first are partially
Shake beam splitter prism, the second polarization beam splitter prism and programmable logic device (CPLD)；Wherein, programmable logic device is by temperature and electricity
The parameter of stream is transmitted to the first control temperature unit and the first current unit, controls the output frequency and output power of main laser；It is main
For the output light of laser after the first half wave plate and the first polarization beam splitter prism, the light of fraction power enters saturation
Saturation-absorption spectrum signal is transmitted to programmable logic device by absorption spectrum unit, absorption spectrum unit；Programmable logic device
Part obtains the output frequency of main laser according to saturation-absorption spectrum signal；The light of most of power is divided by the first high reflection
Piece；The transmitted light of first high reflection light splitting piece enters the first power detector；First power detector is connected to programmable logic
Device, measurement obtain the output power of main laser；The reflected light of first high reflection light splitting piece enters the second high reflection light splitting piece,
First output light of the reflected light as main laser, transmitted light enter the second polarization beam splitter prism；Programmable logic device connection
To frequency stabilization unit, frequency stabilization unit is connected to the first current unit, when the output power and output frequency of main laser are target function
When rate and target frequency, programmable logic device starts frequency stabilization unit；Programmable logic device passes temperature and the parameter of electric current
The second control temperature unit and the second current unit are transported to, output frequency and output power from laser are controlled；From the defeated of laser
Light passes through highly transmissive light splitting piece out；The reflected light of highly transmissive light splitting piece enters the second power detector；Second power detector connects
It is connected to programmable logic device, measurement obtains the output power from laser；The transmitted light of highly transmissive light splitting piece passes through the two or two
After/mono- wave plate and the second polarization beam splitter prism, the light transmission of most of power is as the second output light from laser；Through
After the light reflection of fraction power after second polarization beam splitter prism with the main laser that is transmitted through the second high reflection light splitting piece
Swash combiner, high-speed photodetector is entered after quarter-wave plate, generates beat signal；Beat signal is by frequency dividing
Device, output frequency are converted to input frequency 1/N, are input to programmable logic device, N is frequency dividing ratio, and N is natural number.
Programmable logic device (CPLD) realizes main laser parameter setting unit, main laser spectrum record by programming
Member, main laser power trace unit note down unit, beat signal frequency from laser parameter setup unit, from laser power
Rate measuring unit and main control unit；Wherein, main laser parameter setting unit, main laser spectrum recording unit, main laser
Power trace unit notes down unit and beat signal frequency measuring unit from laser parameter setup unit, from laser power
It is respectively connected to main control unit；First control temperature unit, the first current unit and frequency stabilization unit are separately connected main laser parameter and set
The running parameter of main laser is arranged by main laser parameter setting unit for order member, main control unit；Saturation-absorption spectrum list
Member is connected to main laser spectrum recording unit, and main laser spectrum recording unit is led by analysis saturation-absorption spectrum
The output frequency of laser；First power detector is connected to main laser power trace unit, obtains the output of main laser
Power；Second control temperature unit and the second current unit are separately connected from laser parameter setup unit, and main control unit is by from swashing
The running parameter from laser is arranged in light device parameter setting unit；Second power detector is connected to from laser power and notes down list
Member obtains the output power from laser；Frequency divider is connected to beat signal frequency measuring unit, measures the output letter of frequency divider
Number frequency.
First power detector and the second power detector use photodiode.
High-speed photodetector uses indium gallium arsenic detector.
It is another object of the present invention to provide a kind of control methods for judging automatically and setting laser frequency and power.
The control method for judging automatically and setting laser frequency and power of the invention, comprising the following steps:
1) measurement obtains temperature to the regulation rate and electric current of the output frequency of main laser to the defeated of main laser in advance
The regulation rate of frequency out, and temperature is measured to the regulation rate of the output frequency from laser and electric current to from the defeated of laser
The regulation rate of frequency out will measure obtained known parameters above and be stored in main control unit；And in main control unit in advance
The target frequency and target power of storage main laser and target frequency and target power from laser；
2) desired temperature and current setting value of setting scanning main laser, and setting scan the temperature from laser
Setting value and current setting value, in order to judge automatically and set the frequency of main laser, main control unit is with certain frequency interval pair
The desired temperature of a series of scanning main laser of the temperature step size settings answered, on each desired temperature, master control list
Member sets the current setting value of a series of scanning main laser with the corresponding current steps of smaller frequency interval；
3) obtain the first job point of main laser: main control unit passes through main laser parameter setting unit control first
Control temperature unit, main control unit generate a series of desired temperature of main lasers, swash since minimum desired temperature to main
Light device carries out temperature scanning, and controls the first current unit on each desired temperature with smaller interval scan main laser
The current setting value of device, while main laser spectrum recording unit records the saturated absorption light of the main laser after digitlization in real time
Spectrum signal, main control unit judge that whether occurring laser and the saturation-absorption spectrum of atomic resonance in the spectral signal recorded believes
Number, when main control unit goes out spectrum letter by the ratio in judgement for occurring transmission peaks and the corresponding electric current spacing of transmission peaks in spectral signal
After occurring saturation-absorption spectrum signal in number and judging the output frequency of the corresponding main laser of transmission peaks, find and target frequency
The equal output frequency of rate, main control unit record main laser output frequency be the corresponding desired temperature of target frequency,
The output power of current setting value and at this time main laser, to obtain the first job point of main laser；
4) main control unit compares under the conditions of the first job of main laser point, and the output frequency of main laser is target frequency
When rate, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with first job point
Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser
Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser
Frequency and power judging automatically and set, enter step 9)；
If b) 5) difference of main laser output power and target power enters step other than fault-tolerant section；
5) it obtains second operating point of main laser: if the output power of main laser is less than target power, increasing
Add the current setting value of main laser；If the output power of main laser is greater than target power, reduce the electricity of main laser
Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency of main laser
The regulation rate of the output frequency of main laser calculates, and obtains so that the constant temperature value of the output frequency of main laser；Master control list
The temperature of main laser is set as the temperature value being calculated above by member, scans the electric current of main laser again, and search is full
With absorption spectrum signal, main control unit judges that the output frequency of the corresponding main laser of spectral signal, main control unit are recorded
The output frequency of main laser is the corresponding desired temperature of target frequency, current setting value and the output of main laser at this time
Power, to obtain second operating point of main laser；
6) main control unit compares under the conditions of second operating point of main laser, and the output frequency of main laser is target
When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with second operating point
Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser
Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser
Frequency and power judging automatically and set, enter step 9)；
If b) 7) difference of main laser output power and target power enters step other than fault-tolerant section；
7) the m-th operating point of main laser is obtained, M initial value is the natural number that 3, M is >=3, and main control unit is according to
(M-1) when the output frequency of main laser is target frequency under a operating point and a operating point (M-2), corresponding temperature setting
Value, current setting value and output power, the output frequency that main laser is calculated is target frequency and power is target function
When rate, the temperature of main laser is set as above-mentioned and is calculated by corresponding desired temperature and current setting value, main control unit
Desired temperature, then keep desired temperature it is constant, swept in the continuous tuning coverage of the electric current of the not mode hopping of main laser
Electric current is retouched, main control unit judges that the output frequency of main laser, main control unit record main laser according to the spectral signal of record
The output frequency of device is the corresponding desired temperature of target frequency, current setting value and the output power of main laser at this time,
To obtain the m-th operating point of main laser；
8) main control unit compares under the conditions of the m-th operating point of main laser, and the output frequency of main laser is target
When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with m-th operating point
Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser
Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser
Frequency and power judging automatically and set, enter step 9)；
If b) difference of main laser output power and target power is other than fault-tolerant section, M=M+1, return step
7)；
9) obtain the first job point from laser: main control unit is by controlling second from laser parameter setup unit
Control temperature unit will be set on a series of desired temperature from laser from the temperature of laser, and in each temperature
Current setting value of second current unit with smaller interval scan from laser is controlled in setting value, while main control unit controls
Beat signal frequency measuring unit measures the frequency of the output signal of frequency divider, until observe the frequency measurement of non-zero, and
Obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when temperature setting
Value, current setting value and output power, obtain the first job point from laser；
10) main control unit compares under the conditions of the first job point from laser, is mesh from the output frequency of laser
When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 11) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section
Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
The frequency of device and judging automatically and setting for power；
11) it obtains from second operating point of laser: if being less than target power from the output power of laser, increasing
Add the current setting value from laser；If being greater than target power from the output power of laser, reduce the electricity from laser
Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency from laser
It is calculated from the regulation rate of the output frequency of laser, obtains the temperature value so that constant from the output frequency of laser；Master control list
Member will be set as the temperature value being calculated above from the temperature of laser, scan the electric current from laser again, until seeing
Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider
Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when
Desired temperature, current setting value and output power are obtained from second operating point of laser；
12) main control unit compares under the conditions of from second operating point of laser, is mesh from the output frequency of laser
When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 13) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section
Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
The frequency of device and judging automatically and setting for power；
13) it obtains from the m-th operating point of laser, M initial value is the natural number that 3, M is >=3, and main control unit is according to
(M-1) when being target frequency from the output frequency of laser under a operating point and a operating point (M-2), corresponding temperature setting
Value, current setting value and output power, being calculated from the output frequency of laser is target frequency and power is target function
When rate, corresponding desired temperature and current setting value, main control unit will be set as above-mentioned from the temperature of laser and is calculated
Desired temperature, then keep desired temperature it is constant, the sweep current near the current setting value being calculated, until see
Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider
Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when
Desired temperature, current setting value and output power are obtained from the m-th operating point of laser；
14) main control unit compares under the conditions of from the m-th operating point of laser, is target from the output frequency of laser
When frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power other than fault-tolerant section, M=M+1, return step
13)；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section
Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
The frequency of device and judging automatically and setting for power.
Wherein, in step 3), the output frequency of the corresponding main laser in interval of every two adjacent desired temperature
Interval is less than the continuous tuning coverage of the electric current of the not mode hopping of main laser.
In step 9), the output frequency from laser is obtained, comprising the following steps: when beat signal frequency measuring unit
When measuring the frequency of non-zero, the frequency of main laser is ν, and main laser and the beat frequency rate from laser are f, can not be true
The fixed output frequency from laser, from the frequency of laser, there are two possible values: ν+f and ν-f at this time；Due to electric current to from
The regulation rate of the output frequency of laser is known, so main control unit is adjusted from laser after measuring beat signal
Electric current make from the output frequency of laser increase, then again measure beat signal frequency, if the frequency of beat signal
Rate increases, and is ν-from the frequency of laser if the frequency of beat signal reduces then being ν+f from the frequency of laser
f。
Advantages of the present invention:
The present invention uses twin-laser structure, and main control unit can be searched for automatically according to spectral signal and be judged automatically main sharp
Frequency is automatically become locked to atom after the output power to target power of Automatic Optimal main laser by the output frequency of light device
Or on molecular spectrum；Beat signal is generated after closing beam from the output of laser and main laser, main control unit can judge automatically
The size relation of main laser and the output frequency from laser, thus it is accurate and judge automatically output frequency from laser,
After output power to target power of the Automatic Optimal from laser, frequency locking error signal is generated using main control unit, in 80GHz
It realizes in range to the locking from laser frequency；Method of the invention can be widely used in laser cooling, atomic frequency standard, former
The basic research such as sub- interferometer and laser wavelength meter and Technology of Precision Measurement field.
Detailed description of the invention
Fig. 1 is the structure chart of the control system for judging automatically and setting laser frequency and power of the invention.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the present invention is further explained.
As shown in Figure 1, judge automatically and the set laser frequency and the control system of power of the present embodiment include: main laser
Device, from laser, the first control temperature unit, the second control temperature unit, the first current unit, the second current unit, the first power detection
Device, the second power detector, saturation-absorption spectrum unit, frequency stabilization unit, high-speed photodetector, frequency divider, the first high reflection
Light splitting piece, the second high reflection light splitting piece, highly transmissive light splitting piece, the first half wave plate, the second half wave plate, four/
One wave plate, the first polarization beam splitter prism, the second polarization beam splitter prism and programmable logic device (CPLD)；Wherein, programmable logic
Device CPLD realizes main laser parameter setting unit, main laser spectrum recording unit, main laser power note by programming
It records unit, note down unit, beat signal frequency measuring unit and master control list from laser parameter setup unit, from laser power
Member；Main laser parameter setting unit, main laser spectrum recording unit, main laser power trace unit, from laser join
Number setup unit is respectively connected to main control unit from laser power record unit and beat signal frequency measuring unit；First
Control temperature unit, the first current unit and frequency stabilization unit are separately connected main laser parameter setting unit, and main control unit is swashed by main
The running parameter of light device parameter setting unit setting main laser；Saturation-absorption spectrum unit is connected to main laser spectrum record
Unit, main laser spectrum recording unit obtain the output frequency of main laser by analysis saturation-absorption spectrum；First power
Detector is connected to main laser power trace unit, obtains the output power of main laser；Second control temperature unit and the second electricity
Stream unit is separately connected from laser parameter setup unit, and main control unit from laser parameter setup unit by being arranged from laser
The running parameter of device；Second power detector is connected to from laser power and notes down unit, obtains the output power from laser；
Frequency divider is connected to beat signal frequency measuring unit, measures the frequency of the output signal of frequency divider；Programmable logic device
The parameter of temperature and electric current is transmitted to the first control temperature unit and the first electricity by main laser parameter setting unit by main control unit
Unit is flowed, the output frequency and output power of main laser are controlled；The output light of main laser passes through the first half wave plate
After the first polarization beam splitter prism, the light of 5% power enters saturation-absorption spectrum unit, and absorption spectrum unit is by saturated absorption light
Spectrum signal is transmitted to the main laser spectrum recording unit of programmable logic device；The main control unit of programmable logic device according to
Saturation-absorption spectrum signal obtains the output frequency of main laser；The light of 95% power passes through the first high reflection light splitting piece；First
The light transmission of high reflection light splitting piece 5% enters the first power detector；First power detector is connected to programmable logic device
Main laser power trace unit, measurement obtain the output power of main laser；The light of first high reflection light splitting piece 95% is anti-
It injecting into the second high reflection light splitting piece, the light of the second high reflection light splitting piece 95% reflects the first output light as main laser,
5% light transmission enters the second polarization beam splitter prism；The main laser parameter setting unit of programmable logic device is connected to surely
Frequency unit, frequency stabilization unit are connected to the first current unit, when main laser output power and output frequency be target power and
When target frequency, programmable logic device starts frequency stabilization unit；The main control unit of programmable logic device from laser by joining
The parameter of temperature and electric current is transmitted to the second control temperature unit and the second current unit by number setup unit, is controlled from the defeated of laser
Frequency and output power out；Pass through highly transmissive light splitting piece from the output light of laser；The light of highly transmissive light splitting piece 5% is reflected into
Second power detector；Second power detector is connected to the slave laser power record unit of programmable logic device, measurement
Obtain the output power from laser；Highly transmissive 95% light of light splitting piece is transmitted through the second half wave plate and the second polarization
After beam splitter prism, the light transmission of 95% power is as the second output light from laser；5% after the second polarization beam splitter prism
Sharp combiner after the light reflection of power with the main laser transmitted through the second high reflection light splitting piece, after quarter-wave plate
Into high-speed photodetector, using indium gallium arsenic detector, measurement frequency bandwidth is 40GHz, generates beat signal；Beat frequency letter
Number pass through frequency divider, output frequency be converted to input frequency 1/N, be input to programmable logic device beat signal frequency measurement
Unit.
The control method for judging automatically and setting laser frequency and power of the present embodiment, comprising the following steps:
1) measurement obtains temperature to the regulation rate and electric current of the output frequency of main laser to the defeated of main laser in advance
The regulation rate of frequency out, and temperature is measured to the regulation rate of the output frequency from laser and electric current to from the defeated of laser
The regulation rate of frequency out will measure obtained known parameters above and be stored in main control unit, the order of magnitude of the tuning rate of temperature
For 20GHz/K, the order of magnitude of the regulation rate of electric current is 1GHz/mA；And the mesh of main laser is stored in advance in main control unit
Mark frequency and target power and target frequency and target power from laser；
2) desired temperature and current setting value of setting scanning main laser, and setting scan the temperature from laser
Setting value and current setting value, in order to judge automatically and set the frequency of main laser, main control unit is with certain frequency interval pair
The desired temperature of a series of scanning main laser of the temperature step size settings answered, the interval of every two adjacent desired temperature
The output frequency interval of corresponding main laser is less than the continuous tuning coverage of the electric current of the not mode hopping of main laser, at each
On desired temperature, main control unit sets a series of scanning main laser with the corresponding current steps of smaller frequency interval
Current setting value, current steps are related with sample, are 1/10th of the line width of sample；
3) obtain the first job point of main laser: main control unit passes through main laser parameter setting unit control first
Control temperature unit, main control unit generate a series of desired temperature of main lasers, swash since minimum desired temperature to main
Light device carries out temperature scanning, and controls the first current unit on each desired temperature with smaller interval scan main laser
The current setting value of device, while main laser spectrum recording unit records the saturated absorption light of the main laser after digitlization in real time
Spectrum signal, main control unit judge that whether occurring laser and the saturation-absorption spectrum of atomic resonance in the spectral signal recorded believes
Number, when main control unit goes out spectrum letter by the ratio in judgement for occurring transmission peaks and the corresponding electric current spacing of transmission peaks in spectral signal
After occurring saturation-absorption spectrum signal in number and judging the output frequency of the corresponding main laser of transmission peaks, find and target frequency
The equal output frequency of rate, main control unit record main laser output frequency be the corresponding desired temperature of target frequency,
The output power of current setting value and at this time main laser, to obtain the first job point of main laser；
4) main control unit compares under the conditions of the first job of main laser point, and the output frequency of main laser is target
When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, tolerance area in the present embodiment
Between be ± 5%, then with the parameter of first job point for main laser parameter, main control unit opened by main laser parameter setting unit
Dynamic frequency stabilization unit, the output frequency of main laser is locked at the corresponding spectral signal peak value of target frequency, that is, is locked in light
On the resonance point of spectrum, the frequency of main laser and judging automatically and setting for power are completed, is entered step 9)；
If b) 5) difference of main laser output power and target power enters step other than fault-tolerant section；
5) it obtains second operating point of main laser: if the output power of main laser is less than target power, increasing
Add the current setting value of main laser；If the output power of main laser is greater than target power, reduce the electricity of main laser
Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency of main laser
The regulation rate of the output frequency of main laser calculates, and obtains so that the constant temperature value of the output frequency of main laser；Master control list
The temperature of main laser is set as the temperature value being calculated above by member, scans the electric current of main laser again, and search is full
With absorption spectrum signal, main control unit judges that the output frequency of the corresponding main laser of spectral signal, main control unit are recorded
The output frequency of main laser is the corresponding desired temperature of target frequency, current setting value and the output of main laser at this time
Power, to obtain second operating point of main laser；
6) main control unit compares under the conditions of second operating point, main when the output frequency of main laser is target frequency
The target power of the preset main laser stored in the output power and main control unit of laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with second operating point
Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser
Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser
Frequency and power judging automatically and set, enter step 9)；
If b) 7) difference of main laser output power and target power enters step other than fault-tolerant section；
7) the m-th operating point of main laser is obtained, M initial value is the natural number that 3, M is >=3, and main control unit is according to
(M-1) when the output frequency of main laser is target frequency under a operating point and a operating point (M-2), corresponding temperature setting
Value, current setting value and output power, the output frequency that main laser is calculated is target frequency and power is target function
When rate, the temperature of main laser is set as above-mentioned and is calculated by corresponding desired temperature and current setting value, main control unit
Desired temperature, then keep desired temperature it is constant, swept in the continuous tuning coverage of the electric current of the not mode hopping of main laser
Electric current is retouched, main control unit judges that the output frequency of main laser, main control unit record main laser according to the spectral signal of record
The output frequency of device is the corresponding desired temperature of target frequency, current setting value and the output power of main laser at this time,
To obtain the m-th operating point of main laser；
8) main control unit compares under the conditions of the m-th operating point of main laser, and the output frequency of main laser is target
When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If c) difference of main laser output power and target power is within fault-tolerant section (± 5%), with m-th
The parameter of operating point is main laser parameter, and main control unit starts frequency stabilization unit by main laser parameter setting unit, by main laser
The output frequency of device is locked at the corresponding spectral signal peak value of target frequency, that is, is locked on the resonance point of spectrum, and master is completed
9) frequency of laser and judging automatically and setting for power, enter step；
If d) other than fault-tolerant section (± 5%), M=M+1 is returned the difference of main laser output power and target power
Return step 7)；
9) obtain the first job point from laser: main control unit is by controlling second from laser parameter setup unit
Control temperature unit will be set on a series of desired temperature from laser from the temperature of laser, and in each temperature
Current setting value of second current unit with smaller interval scan from laser is controlled in setting value, while main control unit controls
Beat signal frequency measuring unit measures the frequency of the output signal of frequency divider, until observe the frequency measurement of non-zero, this
When from the difference on the frequency of laser and main laser within the scope of ± 40GHz, and the output frequency from laser is obtained, when beat frequency is believed
When number frequency measurement unit measures the frequency of non-zero, the frequency of main laser is ν, and the beat frequency rate of two lasers is f,
The output frequency from laser is not can determine that, there are two possible values: ν+f and ν-f from the frequency of laser at this time；Due to
Electric current is known to the regulation rate of the output frequency from laser, so after measuring beat signal, main control unit adjustment
To increase from the output frequency of laser from the electric current of laser, the frequency of beat signal is then measured again, if beat frequency
The frequency of signal increases, then from the frequency of laser be ν+f, if the frequency of beat signal reduces, from laser
Frequency be ν-f, main control unit record from the output frequency of laser be target frequency when desired temperature, current setting value and
Output power obtains the first job point from laser；
10) main control unit compares under the conditions of the first job point from laser, is mesh from the output frequency of laser
When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power fault-tolerant section (in the present embodiment be ± 5%) with
Outside, it enters step 11)；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section
Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
The frequency of device and judging automatically and setting for power；
11) it obtains from second operating point of laser: if being less than target power from the output power of laser, increasing
Add the current setting value from laser；If being greater than target power from the output power of laser, reduce the electricity from laser
Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency from laser
It is calculated from the regulation rate of the output frequency of laser, obtains the temperature value so that constant from the output frequency of laser；Master control list
Member will be set as the temperature value being calculated above from the temperature of laser, scan the electric current from laser again, until seeing
Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider
Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when
Desired temperature, current setting value and output power are obtained from second operating point of laser；
12) main control unit compares under the conditions of from second operating point of laser, is mesh from the output frequency of laser
When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 13) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section
Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
The frequency of device and judging automatically and setting for power；
13) it obtains from the m-th operating point of laser, M initial value is the natural number that 3, M is >=3, and main control unit is according to
(M-1) when being target frequency from the output frequency of laser under a operating point and a operating point (M-2), corresponding temperature setting
Value, current setting value and output power, being calculated from the output frequency of laser is target frequency and power is target function
When rate, corresponding desired temperature and current setting value, main control unit will be set as above-mentioned from the temperature of laser and is calculated
Desired temperature, then keep desired temperature it is constant, the sweep current near the current setting value being calculated, until see
Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider
Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when
Desired temperature, current setting value and output power are obtained from the m-th operating point of laser；
14) main control unit compares under the conditions of from the m-th operating point of laser, is target from the output frequency of laser
When frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power other than fault-tolerant section, M=M+1, return step
13)；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section
Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
The frequency of device and judging automatically and setting for power.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field
Technical staff be understood that without departing from the spirit and scope of the invention and the appended claims, it is various replacement and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
Subject to the range that sharp claim defines.
Claims (3)
1. a kind of control method for judging automatically and setting laser frequency and power, which is characterized in that the control method includes
Following steps:
1) measurement in advance obtains output frequency of the temperature to the regulation rate of the output frequency of main laser and electric current to main laser
The regulation rate of rate, and temperature is measured to the regulation rate and electric current of the output frequency from laser to the output frequency from laser
The regulation rate of rate will measure obtained known parameters above and be stored in main control unit；And it is stored in advance in main control unit
The target frequency and target power of main laser and target frequency and target power from laser；
2) desired temperature and current setting value of setting scanning main laser, and setting scanning are set from the temperature of laser
Value and current setting value, in order to judge automatically and set the frequency of main laser, main control unit is corresponding with certain frequency interval
Temperature step size settings it is a series of scanning main laser desired temperature, on each desired temperature, main control unit with
The corresponding current steps of smaller frequency interval set the current setting value of a series of scanning main laser；
3) obtain the first job point of main laser: main control unit controls the first temperature control by main laser parameter setting unit
Unit, main control unit generate a series of desired temperature of main lasers, to main laser since minimum desired temperature
Temperature scanning is carried out, and controls the first current unit on each desired temperature with smaller interval scan main laser
Current setting value, while main laser spectrum recording unit records the saturation-absorption spectrum letter of the main laser after digitlization in real time
Number, whether there is the saturation-absorption spectrum signal of laser and atomic resonance in the spectral signal that main control unit judgement is recorded,
When main control unit goes out spectral signal by the ratio in judgement for transmission peaks and the corresponding electric current spacing of transmission peaks occur in spectral signal
After the middle output frequency for saturation-absorption spectrum signal occur and judging the corresponding main laser of transmission peaks, find and target frequency
Equal output frequency, the output frequency that main control unit records main laser is the corresponding desired temperature of target frequency, electricity
Setting value and the at this time output power of main laser are flowed, to obtain the first job point of main laser；
4) main control unit compares under the conditions of the first job of main laser point, and the output frequency of main laser is target frequency
When, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with the ginseng of first job point
Number is main laser parameter, and main control unit starts frequency stabilization unit by main laser parameter setting unit, by the output frequency of main laser
Rate is locked at the corresponding spectral signal peak value of target frequency, that is, is locked on the resonance point of spectrum, is completed the frequency of main laser
9) judging automatically and setting for rate and power, enters step；
If b) 5) difference of main laser output power and target power enters step other than fault-tolerant section；
5) it obtains second operating point of main laser: if the output power of main laser is less than target power, increasing master
The current setting value of laser；If the output power of main laser is greater than target power, the electric current for reducing main laser is set
Then definite value swashs according to regulation rate and electric current of the temperature pre-stored in main control unit to the output frequency of main laser to main
The regulation rate of the output frequency of light device calculates, and obtains so that the constant temperature value of the output frequency of main laser；Main control unit will
The temperature of main laser is set as the temperature value being calculated above, scans the electric current of main laser again, and search saturation is inhaled
Spectral signal is received, main control unit judges that the output frequency of the corresponding main laser of spectral signal, main control unit are recorded main sharp
The output frequency of light device is the corresponding desired temperature of target frequency, current setting value and the output work of main laser at this time
Rate, to obtain second operating point of main laser；
6) main control unit compares under the conditions of second operating point of main laser, and the output frequency of main laser is target frequency
When, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with the ginseng of second operating point
Number is main laser parameter, and main control unit starts frequency stabilization unit by main laser parameter setting unit, by the output frequency of main laser
Rate is locked at the corresponding spectral signal peak value of target frequency, that is, is locked on the resonance point of spectrum, is completed the frequency of main laser
9) judging automatically and setting for rate and power, enters step；
If b) 7) difference of main laser output power and target power enters step other than fault-tolerant section；
7) the m-th operating point of main laser is obtained, M initial value is the natural number that 3, M is >=3, and main control unit is according to (M-1)
When the output frequency of main laser is target frequency under a operating point and a operating point (M-2), corresponding desired temperature, electricity
Setting value and output power are flowed, when the output frequency that main laser is calculated is target frequency and power is target power,
The temperature of main laser is set as the above-mentioned temperature being calculated by corresponding desired temperature and current setting value, main control unit
Then setting value keeps desired temperature constant, in the continuous tuning coverage sweep current of the electric current of the not mode hopping of main laser,
Main control unit judges that the output frequency of main laser, main control unit record the output of main laser according to the spectral signal of record
Frequency is the corresponding desired temperature of target frequency, current setting value and the output power of main laser at this time, to obtain
The m-th operating point of main laser；
8) main control unit compares under the conditions of the m-th operating point of main laser, and the output frequency of main laser is target frequency
When, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with the ginseng of m-th operating point
Number is main laser parameter, and main control unit starts frequency stabilization unit by main laser parameter setting unit, by the output frequency of main laser
Rate is locked at the corresponding spectral signal peak value of target frequency, that is, is locked on the resonance point of spectrum, is completed the frequency of main laser
9) judging automatically and setting for rate and power, enters step；
If b) difference of main laser output power and target power is other than fault-tolerant section, M=M+1, return step 7)；
9) obtain the first job point from laser: main control unit is by controlling the second temperature control from laser parameter setup unit
Unit will be set on a series of desired temperature from laser from the temperature of laser, and be set in each temperature
Current setting value of second current unit with smaller interval scan from laser is controlled in value, while main control unit controls beat frequency
Signal frequency measuring unit measures the frequency of the output signal of frequency divider, until observing the frequency measurement of non-zero, and obtains
From the output frequency of laser, main control unit record from the output frequency of laser be target frequency when desired temperature, electricity
Setting value and output power are flowed, the first job point from laser is obtained；
10) main control unit compares under the conditions of the first job point from laser, is target frequency from the output frequency of laser
When rate, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 11) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates frequency locking b) from the difference of the output power of laser and target power within fault-tolerant section
Error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
Frequency and power judging automatically and setting；
11) obtain from second operating point of laser: if from the output power of laser be less than target power, increase from
The current setting value of laser；If being greater than target power from the output power of laser, reduction is set from the electric current of laser
Definite value, then according to temperature pre-stored in main control unit to the regulation rate of the output frequency from laser and electric current to from swashing
The regulation rate of the output frequency of light device calculates, and obtains the temperature value so that constant from the output frequency of laser；Main control unit will
It is set as the temperature value being calculated above from the temperature of laser, scans the electric current from laser again, until observes
The frequency measurement of non-zero, while the frequency of the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider
Rate, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when temperature
Setting value, current setting value and output power are obtained from second operating point of laser；
12) main control unit compares under the conditions of from second operating point of laser, is target frequency from the output frequency of laser
When rate, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 13) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates frequency locking b) from the difference of the output power of laser and target power within fault-tolerant section
Error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
Frequency and power judging automatically and setting；
13) it obtains from the m-th operating point of laser, M initial value is the natural number that 3, M is >=3, and main control unit is according to (M-
1) when being target frequency from the output frequency of laser under a operating point and a operating point (M-2), corresponding desired temperature,
Current setting value and output power, being calculated from the output frequency of laser is target frequency and power is target power
When, corresponding desired temperature and current setting value, main control unit will be set as above-mentioned from the temperature of laser and is calculated
Then desired temperature keeps desired temperature constant, the sweep current near the current setting value being calculated, until observation
To the frequency measurement of non-zero, while main control unit control beat signal frequency measuring unit measures the output signal of frequency divider
Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when temperature
Setting value, current setting value and output power are spent, is obtained from the m-th operating point of laser；
14) main control unit compares under the conditions of from the m-th operating point of laser, is target frequency from the output frequency of laser
When, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power other than fault-tolerant section, M=M+1, return step 13)；
If main control unit generates frequency locking b) from the difference of the output power of laser and target power within fault-tolerant section
Error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser
Frequency and power judging automatically and setting.
2. control method as described in claim 1, which is characterized in that in step 3), every two adjacent desired temperature
The corresponding main laser in interval output frequency interval be less than main laser not mode hopping electric current continuous tuning coverage.
3. control method as described in claim 1, which is characterized in that in step 9), the output frequency from laser is obtained,
The following steps are included: when beat signal frequency measuring unit measures the frequency of non-zero, the frequency of main laser is ν, two
The beat frequency rate of laser is f, not can determine that the output frequency from laser, and from the frequency of laser, there are two may at this time
Value: ν+f and ν-f；Due to regulation rate of the electric current to the output frequency from laser be it is known, so measuring beat frequency
After signal, main control unit adjustment to increase from the output frequency of laser from the electric current of laser, then measures beat frequency again
The frequency of signal is ν+f from the frequency of laser, if the frequency of beat signal if the frequency of beat signal is increased
Reduce, then from the frequency of laser be ν-f.
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| CN110867720B (en) * | 2018-08-27 | 2020-09-08 | 北京大学 | Miniaturized low-cost large-frequency tuning range frequency-stabilized laser system and method |
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