CN1734912A - A kind of integrated power supply that is used for the short pulse heavy current laser driving - Google Patents
A kind of integrated power supply that is used for the short pulse heavy current laser driving Download PDFInfo
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- CN1734912A CN1734912A CN 200510027803 CN200510027803A CN1734912A CN 1734912 A CN1734912 A CN 1734912A CN 200510027803 CN200510027803 CN 200510027803 CN 200510027803 A CN200510027803 A CN 200510027803A CN 1734912 A CN1734912 A CN 1734912A
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Abstract
The present invention relates to a kind of integrated power supply that short pulse heavy current laser drives that is used for, constitute by pulse generator, impulse level transducer, pulsed drive output unit, low frequency DC control unit and current monitoring output and trigger voltage output, tuning low frequency direct current biasing input and the biasing monitoring output of laser wavelength.Pulse repetition frequency 10-100KHz, pulse width range 100ns-1 μ s, and independent respectively adjustable.The driving pulse voltage amplitude can be set to tens of volt scopes at one volt, electric current reaches several amperes and even tens of ampere, the duty cycle adjustment scope of driving pulse electric current can surpass two orders of magnitude, has high stability, not only can be undertaken tuning by the excitation wavelength of low frequency or direct current biasing noise spectra of semiconductor lasers, and the wave mode and the amplitude of the real-time Laser Measurement device of available oscilloscope drive current, undertaken synchronously by trigger impulse.Be a kind of pervasive semiconductor laser pulse power, highly versatile.
Description
Technical field
The present invention relates to a kind of integrated power supply that short pulse heavy current laser drives that is used for, or rather, the invention provides the adjustable semiconductor laser pulse driving power of a kind of driving parameters on a large scale, can be used for a series of special semiconductor lasers that need under the pulsed drive condition of harshness, work and conventional pulse high power semiconductor lasers, in also can be used for, low power laser.The invention belongs to semiconductor photoelectronic device and electronic circuit technology field.
Background technology
Since the semiconductor laser invention of the sixties in last century, its structure develops into heterojunction, quantum well, distributed feed-back and surface launching or the like by simple homojunction, but its basic structure is an ambipolar diode, and the laser of these kinds has been realized commercialization and has been applied to various fields.Along with the progress of semiconductor laser theory and material growing technology, occurred the quantum cascade laser of one pole type in 1994, and in 10 years, significant progress has been arranged.
Quantum cascade laser is the one pole type diode laser with cascade structure, compare with traditional pn junction laser and to have a series of characteristics: at first, because it generally has nearly tens grades cascade structure, and the relative efficiency of each grade is lower, need bigger drive current when therefore working, generally extremely count order of amps at hundreds of milliamperes; Secondly, driving voltage required when its cascade structure has determined its work is higher, generally ten volts of magnitudes; The laser core district power density of being born is very high in the case, and caloric value will be very big when continuous wave is worked, and is difficult to dissipate.Therefore, this type of device often need be worked under pulsed drive reducing caloric value, and required pulse parameter such as duty when pulsewidth etc. often need can regulate within a large range requirement that this has just brought very high intimate harshness for its driving power.For example: the quantum cascade laser of a certain routine needs 10 volts driving voltage and 2 amperes drive current, as to require its average driving power be 20 milliwatts, then its pulse duty factor can only be 0.1%, as repetition rate is 10KHz, then pulse duration can only be 100ns, high frequency requires to have reached hundred MHz magnitudes, because the impedance during laser works is very low, generally below 10 ohm, consider the influence that this moment, high frequency connected, the actual pulse output voltage that requires can be more than 30 volts, and this laser just needs the pulse generator of a 50V/2A/100ns to drive like this, and requirement is quite harsh.Though the existing in the world commodity of this kind pulse generator, its price is very high, and import needs tens thousand of dollars, and volume and power consumption are also very big, and the laser that is used to drive under the practical application is inappropriate.
In recent years along with the development of semiconductor laser, novel laser such as II type cascaded laser, interband cascaded laser etc. have also occurred, these lasers also have and aforementioned similar driving requirement, and the development of pulse high power laser also has similar requirement to its driving power.Need at these, the present invention aims to provide a kind of pervasive laser pulse power supply, the driving that can satisfy the aforementioned laser device require and have integrated, volume is little, in light weight, characteristics such as cost is low.
Summary of the invention
The invention provides a kind of integrated power supply that short pulse heavy current laser drives that is used for, comprise that the independent respectively adjustable adjustable current impulse of pulse generator, impulse level transducer, output current voltage drives output unit on a large scale, the tuning low frequency direct current biasing control unit of laser wavelength constitutes for pulse repetition frequency and pulse duration on a large scale, also comprise current impulse amplitude monitoring output and trigger voltage pulse output end, low frequency or direct current biasing input and biasing monitoring output.The potential pulse that described pulse generator produces is converted to the pulse with 0-12V level through the pulse level translator, is used for drive current and drives output unit, drive laser again.The laser wavelength harmonic ringing is by low frequency direct current biasing control unit input current pulsed drive output unit.This power supply is except that can be used for driving the semiconductor quantum cascaded laser that often need work under the high-voltage large current short pulse, also be applicable to the other kinds semiconductor laser that needs pulse current to drive, the driving pulse voltage amplitude can be set to tens of volt scopes at about one volt as required, electric current can reach more than several amperes and even tens of amperes, the duty cycle adjustment scope of driving pulse can surpass two orders of magnitude, have very high stability, and can carry out tuning within the specific limits by the excitation wavelength of low frequency or direct current biasing noise spectra of semiconductor lasers.This power supply can be with the wave mode and the amplitude of the real-time Laser Measurement device of oscilloscope drive current, and can carry out outer synchronism stability by the trigger pulse triggers oscilloscope and measure.This power supply also has incorporate characteristics, available civil power or powered battery, and volume, weight, power consumption and cost all much smaller than the pulse generator of routine, also have good protective action to the semiconductor laser that is driven.Therefore, power supply of the present invention is a kind of pervasive semiconductor laser pulse power, has good versatility.
One, pulse generator part:
Pulse generator is used to produce the driving pulse of required pulse parameter, the employing digital integrated circuit constitutes, specifically can use TTL (transistor-transistor logic level) trigger to produce repetition rate and the pulsewidth pulse of adjustable Transistor-Transistor Logic level separately, adopt two groups of resistance-capacitances (RC) as timing network, R is an adjustable resistance, C is a fixed capacity, and concrete numerical value can be chosen according to the requirement of pulse parameter.Pulse output is delivered to level translator after TTL gate circuit buffering.For making it have stronger driving force, can choose TTL gate circuit with 50 Ω driving forces.
The range of pulse repetition frequency 10KHz-100KHz of described pulse generator, pulse width range 100ns-1 μ s, and frequency and width are independent adjustable.
Two, impulse level transducer and current impulse drive output unit:
Because current output unit needs higher drive level, be provided with level translator Transistor-Transistor Logic level is converted to the 0-12V level, this transducer is made of conventional transistor circuit, and it is above to guarantee good high frequency characteristics that transistorized maximum operating frequency is selected in hundreds of MHz.Current impulse drives output unit and adopts device for power switching to constitute, and abundant allowance is chosen and left to its electric current, voltage, power and switch parameter according to the requirement of institute's drive laser.
Three, current impulse amplitude monitoring output and trigger voltage pulse output end:
Since be driven carry out on the laser loop current impulse amplitude measurement the difficulty, be provided with current impulse monitoring output and trigger voltage pulse output end in this power supply especially, the instrument transformer mode is adopted in the monitoring of current impulse amplitude, the trigger voltage pulse is drawn after the gate circuit buffering by pulse generator, wave mode and amplitude that like this can the real-time Laser Measurement device of external oscilloscope drive current, and can trigger under External synchronization mode, to carry out stable observation oscilloscope by trigger impulse.Instrument transformer adopts 50 Ω Low ESRs output guaranteeing good high frequency characteristics, its amplitude calibration to 1V/A to be convenient for measuring, can directly deliver to oscillographic 50 Ω inputs.Owing to adopted gate circuit, utilized the trigger voltage pulse output end also the TTL pulse generator of this power supply as 50 Ω output can be used with strong driving force.
This shows, integrated power supply of the present invention is provided with current impulse monitoring output and trigger voltage output, the wave mode and the amplitude of the output signal reflection laser drive current pulse of current monitoring output, available oscilloscope is measured in real time, the signal of trigger voltage output output can be delivered to oscillographic external trigger input and carry out synchronous waveform, makes it not influenced by current amplitude ground stably to observe the drive current waveform.
Four, low frequency or direct current biasing control input end and bias current monitoring client:
The biasing control input end adopts transistor to follow controllable current its load form formation, and transistorized parameter can be chosen according to the requirement of bias current.The incoming level of this terminal can be chosen as required, for making things convenient for use the incoming level of this terminal can be made as 0-3V, make when applying low frequency bias and can directly use Transistor-Transistor Logic level, can adopt the low frequency fixed-frequency in the use, (this pulse generator can adopt pattern as hereinbefore to the continuously adjustable TTL pulse generator of pulsewidth, but RC is set at required low frequency, can control its access with being integrated in this laser drive power and establishing a switch in addition) excitation wavelength is carried out continuous tuning, it is tuning also can to adopt the direct current input to carry out, and the bias current monitoring client is used for bias current is measured.
This shows, integrated power supply medium and low frequency DC control provided by the invention unit has low frequency direct current biasing control input end and biasing monitoring output, on low frequency direct current biasing control input end, apply low frequency or d. c. voltage signal and can be used for laser and carry out wavelength tuning, and can on biasing monitoring output, directly measure the amplitude of low frequency or dc bias current with oscilloscope or voltmeter.
Five, direct current supply part:
The Switching Power Supply with two-way output is adopted in the direct current supply of this power supply, also can insert the two-way battery to be fit to the instructions for use of special occasions through switching.One tunnel DC power supply is 12V, and its output is also supplied with the TTL circuit and used to guarantee that pulse output has very high stability except that direct supply level translator uses after the secondary voltage stabilizing is 5V.The electric current and voltage of another road DC power supply will and leave enough allowances according to the selection of parameter of institute's drive laser, and this road output becomes adjustable direct current output supplying electric current pulsed drive output unit on a large scale and uses behind an adjustable voltage stabilizing circuit.Owing to be to use under impulsive condition, the output on this road will be through sufficient high and low frequency filtering to guarantee its good stable.Selected Switching Power Supply has short circuit and excess current protective function, can play the better protect effect.
Description of drawings
Fig. 1 is a kind of schematic diagram that is used for the integrated power supply of short pulse heavy current laser driving provided by the invention.
Embodiment
Embodiment below by accompanying drawing further specifies substantive distinguishing features of the present invention and advance, but limits the present invention absolutely not, also is that the present invention is confined to embodiment absolutely not.
Embodiment: the quantum cascade laser heavy current short pulse drives integrated power supply
Implementation step:
1, the pulse driving power parameter of quantum cascade laser requirement is: consider the influence of laser line impedance, require driving voltage output greater than 32V, drive current output is greater than 2A, range of pulse repetition frequency 10KHz-100KHz, pulse width range 100ns-1 μ s, bias-current range 0-100mA.
2, the driving parameters required according to this laser, the two-way output Switching Power Supply that our selected nominal value is 12V0.5A and 36V0.5A is its power supply, because the required maximum duty cycle of laser is 10%, so the DC power supply of 36V0.5A can satisfy the requirement of pulsed drive.
3, regulate requirement according to pulse parameter, the multiturn potentiometer of choosing two 47K has guaranteed enough degrees of regulation as frequency and pulse-width regulated.
4, because the minimum pulse width of driving pulse is 100ns, so choose used transistorized characteristic frequency greater than 500MHz, switching time is below 30ns.
5, require according to drive current voltage and pulse parameter and leave certain allowance, the pulsed operation electric current of choosing device for power switching be greater than 6A (can take parallel way when single tube is difficult to reach), withstand voltage greater than 50V. switching time less than 20ns.
6, fixedly three-terminal regulator block is adopted in 5V secondary voltage stabilizing output, because power consumption very I does not need to add in addition radiator, adjustable three-terminal regulator block is adopted in adjustable voltage stabilizing output, and adopt soft-start mode to avoid its output overshoot, output voltage also adopts multiturn potentiometer to regulate with assurance precision and output smoothing, and has increased independent switch with anti-misoperation at its output.This road output has been added suitable radiator and has been increased multichannel high frequency low frequency filtering because power consumption is bigger.
7, be 25 Ω/1W according to bias-current range decision biasing current-limiting resistance, output and input interface all adopt bnc interface to guarantee its high frequency characteristics.
8, the mains electricity input end increases indicator light and fuse, need need increase diverter switch or adopt automatic switching mode when battery-operated.
9, electronic components associated therewith is installed on the printed circuit board (PCB), and reliably is mounted in the small-sized cabinet by device schematic diagram and related description with miscellaneous part, checks that errorless back connection AC power supplies debugs, and can use after meeting the requirements.
Open the mains supply switch when 10, using this laser drive power earlier, be adjusted to selected pulse parameter, electric current output is transferred to minimum, open electric current output switch, output current is adjusted to required numerical value again, uses the waveform and the amplitude of oscilloscope monitoring output current and bias current in case of necessity, finishing using transfers to minimum with output current, close current output switch cuts out the mains supply switch again.
Claims (10)
1, a kind of integrated power supply that is used for the short pulse heavy current laser driving comprises direct-current switch power supply or battery pack direct current supply, it is characterized in that:
(1) described integrated power supply drives output unit by the independent respectively adjustable pulse generator of pulse repetition frequency and pulse duration, impulse level transducer, current impulse that output current voltage is adjustable and low frequency direct current biasing control unit is formed;
(2) potential pulse of described pulse generator generation is converted to the pulse with 0-12V level through the pulse level translator, is used for drive current and drives output unit, drive laser again;
(3) switching circuit with two-way output is adopted in described direct current supply, and wherein its output of one tunnel DC power supply is directly supplied with level translator and supply with pulse generator after the secondary voltage stabilizing; Another road DC power supply is adjustable, and voltage stabilizing circuit output supplying electric current pulsed drive output unit uses, and its electric current and voltage is selected according to the parameter of institute's drive laser;
(4) the wavelength tuning signal input current pulsed drive output unit of described low frequency direct current biasing control unit.
2, by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 1, it is characterized in that described pulse generator adopts two groups of resistance-capacitances as timing network.
3, by claim 1 or the 2 described integrated power supplies that are used for the short pulse heavy current laser driving, the repetition frequency range that it is characterized in that pulse generator is 10KHz-100KHz; Pulse width range is 100ns-1 μ s; It is to use the TTL trigger to produce repetition rate and the independently pulse of adjustable Transistor-Transistor Logic level of pulse duration.
4, by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 1, the output level that it is characterized in that described pulse generator is conventional transistor-transistor logic level, and the TTL gate circuit for having 50 Ω load driving abilities.
5, by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 1, it is characterized in that level translator is made of conventional transistor circuit, transistorized maximum operating frequency is selected in has good high frequency characteristics more than hundreds of MHz.
6,, it is characterized in that the current impulse output unit adopts device for power switching to constitute by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 1.
7, be used for the integrated power supply that short pulse heavy current laser drives by claim 1 is described, it is characterized in that pulse generator draws trigger voltage output after the gate circuit buffering; Current impulse monitoring output drives output unit by current impulse and draws, it adopts the instrument transformer mode of 50 Ω Low ESRs output, the wave mode and the amplitude of the real-time Laser Measurement device of external oscilloscope drive current, and by trigger impulse oscilloscope is triggered, under External synchronization mode, to carry out stable observation.
8, by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 1, it is characterized in that described low frequency DC control unit has low frequency direct current biasing control input end and biasing monitoring output, on low frequency direct current biasing control input end, apply low frequency or direct current signal and be used for laser and carry out wavelength tuning, on biasing monitoring output, directly measure the amplitude of low frequency or dc bias current with oscilloscope or voltmeter.
9, by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 8, the control input end that it is characterized in that setovering adopts transistor to follow the controllable current its load form, and transistorized parameter should be according to the requirement of bias current; Incoming level is made as the 0-3 volt.
10, by the described integrated power supply that is used for the short pulse heavy current laser driving of claim 1, it is characterized in that the driving pulse voltage amplitude is set in 1 volt to tens of volt scopes, electric current is several amperes to tens of amperes, and the duty cycle adjustment scope of driving pulse surpasses 2 orders of magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100278037A CN100423428C (en) | 2005-07-15 | 2005-07-15 | Integrative power supply for short pulse heavy current laser drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100278037A CN100423428C (en) | 2005-07-15 | 2005-07-15 | Integrative power supply for short pulse heavy current laser drive |
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| Publication Number | Publication Date |
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| CN1734912A true CN1734912A (en) | 2006-02-15 |
| CN100423428C CN100423428C (en) | 2008-10-01 |
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| CNB2005100278037A Expired - Fee Related CN100423428C (en) | 2005-07-15 | 2005-07-15 | Integrative power supply for short pulse heavy current laser drive |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081001 Termination date: 20160715 |