CN104953459B - A kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term and its frequency-stabilizing method - Google Patents
A kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term and its frequency-stabilizing method Download PDFInfo
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Abstract
The invention discloses a kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term and its frequency-stabilizing methods, belong to precise laser frequency stabilization field.Frequency stabilization system is mainly made of more ti sapphire lasers, reference cavity, control cabinet, the reference laser diode (He-Ne laser) of frequency stabilization, polarization beam apparatus, Fabry Perot transmission cavity, photodetector, function signal generator, adder, data collecting card, computer etc., frequency-stabilizing method is that two ti sapphire lasers are locked on respective reference cavity first, then reference cavity is locked on the reference laser diode of frequency stabilization, thus obtain two laser linewidths be respectively less than 100kHz, it is long when frequency drift be respectively less than ± 1MHz ti sapphire laser.It it is an advantage of the present invention that only locking more to frequency stabilization ti sapphire laser simultaneously with a reference laser diode, and can lock it on the optional frequency in tunable range, there is very strong scalability and very high frequency stability.
Description
Technical field
The invention belongs to laser steady frequency technology, it is related to a kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term and its steady
Frequency method, the neck suitable for the laser that laser physics, atom and molecule optics, frequency marking, quantum information etc. need frequency steady in a long-term
Domain.
Background technique
Frequency laser steady in a long-term is most important in the scientific experiment of various fields, realizes the mode of laser frequency stabilization
It is varied, including reference cavity frequency locking technology, saturated absorption frequency stabilization technology etc., different frequency-stabilizing methods cut both ways, such as with reference to
Chamber frequency locking method can narrow line width, but be difficult to overcome long-term frequency drift, saturated absorption method can effectively long-term frequency stabilization, but be only applicable in
In by Frequency Locking certain specific atoms or molecule jump frequency.
Ti sapphire laser has many advantages, such as the wide frequency range of continuously-tuning, exportable single mode or multi-mode laser because of it
By the fields such as physics, chemistry, medical treatment favor, not to it implement frequency stabilization when very big, the traditional titanium precious stone laser of its frequency drift
Device Frequency Stabilization Technique includes by its frequency by being locked on reference cavity, and available line width is relatively narrow, short-term frequency stability laser,
But environment temperature rise and fall, piezoelectric ceramic actuator relaxation will affect its long-term frequency stability, or lock it in atom or
On the saturated absorption peak of molecule, long-term frequency stability is guaranteed, but limit line width narrow and laser frequency can
Any tuning.
It not can be implemented simultaneously that the narrow linewidth of laser, long run frequency are stable, frequency can arbitrarily adjust for existing Frequency Stabilization Technique
The problems such as humorous, ti sapphire laser frequency stabilization system proposed by the present invention and frequency-stabilizing method can combine connecting for laser frequency
Continuous tuning, short-term stability, steadily in the long term and laser linewidth narrows, and two titanium precious stone lasers can be achieved at low cost
Frequency stabilization while device, the long run frequency for being theoretically also applied for other type lasers are stablized.
Summary of the invention
It is an object of the present invention to disclose a kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term and its frequency stabilization side
Method can not combine the continuously-tuning, steady in a long-term of laser frequency to solve traditional ti sapphire laser Frequency Stabilization Technique
And linewidth narrowing, and a set of frequency stabilization system can only lock the problems such as beam of laser causes space waste and higher cost, be laser
The fields such as physics, atom and molecule optics, frequency marking, quantum information provide multi beam narrow linewidth, long run frequency stable laser.
The present invention, which adopts the following technical scheme that, reaches above-mentioned purpose:
A kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term, the frequency stabilization system include: several ti sapphire lasers,
Several reference cavities, several control cabinets, the reference laser diode of frequency stabilization, optoisolator, half-wave plate, beam splitter, polarization point
Beam device, Fabry Perot transmission cavity, photodetector, function signal generator, adder, data collecting card, computer, titanium
Reference cavity is inputted after sapphire laser and carries out linewidth narrowing and preliminary Frequency Locking, is used for laser a part by beam splitter
Output, another part input polarization beam splitter after half-wave plate, frequency stabilization reference laser diode output laser by light every
From also input polarization beam splitter realizes the conjunction beam of titanium precious stone laser and reference laser after device and half-wave plate, the light input method after closing beam
Fabry-Perot transmission cavity, function signal generator export triangular voltage sweep signal function in transmission cavity, transmission cavity by adder
Transmitted light received by photodetector after be changed into electric signal input data capture card, which is passed to the data collected
Computer, the different feedback control signals generated after the analysis of LabVIEW program and processing through writing in computer are by data
Capture card is transmitted separately to adder and control cabinet, and adder applies after being added feedback control signal with triangular voltage sweep signal
In transmission cavity, feedback control signal is applied to reference cavity by control cabinet, and reference cavity exports that narrow linewidth, long run frequency are stable to swash
Light.
A kind of frequency-stabilizing method that laser frequency is steady in a long-term utilizes transmission peaks edge frequency locking technology and transmission cavity frequency stabilization skill
At least two titaniums can be achieved at the same time by the reference laser diode and a Fabry Perot transmission cavity of a frequency stabilization in art
The laser linewidth of sapphire laser is narrowed to be stablized with long run frequency, while two lasers can be locked in tunable range respectively
On interior optional frequency.
Steps of the method are:
A. more ti sapphire lasers are passed through into transmission peaks edge frequency locking technology-locking on respective reference cavity, realizes and swashs
Optical linewidth narrows and preliminary Frequency Locking；
B. the reference laser of all titanium precious stone lasers and frequency stabilization is closed into beam, inputs Fabry Perot transmission cavity；
Its transmitted light is converted to electric signal and input data capture card and meter via photodetector by C. scan transfer chamber
Calculation machine；
D. the LabVIEW program in computer is run, the positional shift by reference laser transmission peaks relative to set point is made
Bias voltage is generated for error signal and is applied to transmission cavity, and transmission cavity is locked on reference laser；
E. slowly apply initial bias at most platform reference cavity；
F. each titanium precious stone laser transmission peaks are raw as error signal relative to the positional shift of reference laser transmission peaks
At corresponding negative feedback voltage real-time effect in respective corresponding reference cavity, while realizing that more laser frequencies are steady in a long-term.
In the step A of this method, the implementation method of transmission peaks edge frequency locking technology is to be obtained first by scanning reference cavity
The transmission peak-to-peak signal of titanium precious stone laser, then selects as a reference point at the half of any one transmission peaks signal strength, will swash
Light frequency drift about caused by transmitted signal strength relative to reference point intensity variation as error signal, feedback regulation annular chamber
Carry out timely frequency of amendment offset, to realize the short-term frequency of laser by laser frequency lock in a certain mode of reference cavity
Rate is stablized, simultaneously because the reference cavity with very high fineness has been selected, according to the line width formula below with reference to chamber, Ti:Sapphire laser
The line width of laser, which also obtains, sufficiently to be narrowed:
Wherein FSR is the free spectrum journey of reference cavity, and Finesse is the fineness of reference cavity.
Bias voltage is obtained by following formula in the step D of this method:
Uoffset(t)=Ke (t)+I ∑ e (t)
Wherein K, I respectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, and e (t) represents reference
The error signal that laser transmission peaks are generated relative to the positional shift of set point.
Negative feedback voltage is obtained by following formula in the step F of this method:
Ui(t)=Kiei(t)+Ii∑ei(t)
Wherein Ki、IiRespectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, ei(t) is represented
The error signal that i titanium precious stone laser transmission peaks are generated relative to the positional shift of reference laser transmission peaks.
The beneficial effects of the present invention are be locked in two ti sapphire lasers on respective reference cavity first, realize
Line width narrow and short-term frequency stability, then reference cavity is locked in the reference of frequency stabilization by transmission cavity frequency stabilization mode
On laser, transmitting of the long-term frequency stability from reference laser diode to ti sapphire laser is realized, is finally obtained two
Laser linewidth be respectively less than 100kHz, it is long when frequency drift be respectively less than ± 1MHz ti sapphire laser.
It is an advantage of the present invention that only two ti sapphire lasers can be locked simultaneously with a reference laser diode, and can incite somebody to action
It distinguishes Frequency Locking on optional frequency in tunable range, has combined the continuously-tuning, short-term of laser frequency
It is stable, steady in a long-term and laser linewidth to narrow.The principle of the invention and device are simple, cost is relatively low, scalability is strong, for a long time
Frequency stabilization effect is obvious, and the long run frequency for being theoretically also applied for other type lasers is stablized.
Detailed description of the invention
By taking two ti sapphire lasers of frequency stabilization simultaneously as an example:
Fig. 1 be laser frequency transmission cavity frequency stabilization system steady in a long-term schematic device (optical path is indicated with solid line in figure,
Dotted line indicates electrical connection).Wherein 1,20 be pumping source, 2,21 be annular chamber, 3,22 be reference cavity, 4 be the first beam splitter, 5,
18 be control cabinet, and 6 be the first half-wave plate, and 7 be adder, and 8 be function signal generator, and 9 be computer, and 10 acquire for data
Card, 11 be photodetector, and 12 be Fabry Perot transmission cavity, and 13 be polarization beam apparatus, and 14 be the second beam splitter, and 15 be the
Two half-wave plates, 16 be optoisolator, and 17 be the reference laser diode (He-Ne laser) of frequency stabilization, and 19 be third half-wave plate, 23
For third beam splitter.
Fig. 2 is the schematic diagram of optical signal transmissive when scanning Fabry Perot transmission cavity.Wherein starting point indicates data acquisition
The first sampling point of card, a indicate first transmission peaks of reference laser diode, and b indicates the transmission peaks of First ti sapphire laser,
C indicates the transmission peaks of second ti sapphire laser, and d indicates second transmission peaks of reference laser diode；X and Y respectively indicates
One, the distance between first transmission peaks of transmission peaks and reference laser diode of two ti sapphire lasers, Z indicate reference laser diode
The distance between two transmission peaks.
Fig. 3 is not use frequency-stabilizing method proposed by the present invention, swashing when only ti sapphire laser being locked on reference cavity
Light frequency stability diagram.
Fig. 4 is to use frequency-stabilizing method proposed by the present invention, while realizing that two ti sapphire laser laser frequencies are steady for a long time
The laserfrequencystability figure of timing, and the thus statistic histogram and gaussian curve approximation of made frequency drift, pass through
The halfwidth of matched curve can know its frequency stability.
Fig. 5 indicates to realize that two ti sapphire laser laser frequencies are steady for a long time simultaneously using frequency-stabilizing method proposed by the present invention
After fixed, the laser tuning of the two to close frequencies is carried out to the obtained beat signal of beat frequency and Lorentz fit curve again, from
In can get ti sapphire laser laser linewidth.
Specific embodiment
A specific embodiment of the invention is described in detail in combination technology scheme and Figure of description.
In the present embodiment, the model of ti sapphire laser is the Matisse TS type of German Sirah company, wherein pumping
Source 1,20 model Millennia eV, reference cavity 3,22 are that temperature controls and is placed on the reference cavity in low vacuum, Fabry-
Paro transmission cavity 12 is the FPI100 type confocal cavity of Toptica company, and the reference laser diode 17 of frequency stabilization is Thorlabs public
The HRS015 type He-Ne laser of department, the PCI-6259 of the model NI company of data collecting card 10.
A kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term, can simultaneously two ti sapphire lasers of frequency stabilization be
Example, as shown in Figure 1, ti sapphire laser includes pumping source and annular chamber, the input of the delivery outlet face annular chamber 2 of pumping source 1
Mouthful, the input port of the delivery outlet face reference cavity 3 of annular chamber, the first beam splitter of slant setting 4 in the output light path of reference cavity 3,
The first half-wave plate 6, polarization beam apparatus 13 are sequentially placed in the reflected light path of the first beam splitter；The reference laser diode of frequency stabilization
The second half-wave plate 15 is placed in the output light path of optoisolator, then is tilted in the input port of 17 delivery outlet face optoisolator 16
Place the second beam splitter 14, it is ensured that the transmitted light path of the second beam splitter is directly entered polarization beam apparatus 13；The output of pumping source 20
The input port of mouth face annular chamber 21, the input port of the delivery outlet face reference cavity 22 of annular chamber, the output light path of reference cavity 22
Middle slant setting third beam splitter 23 places third half-wave plate 19, it is ensured that third half-wave in the reflected light path of third beam splitter
The output light path of piece 19 is directly entered polarization beam apparatus 13 after the reflection of the second beam splitter 14；The output of polarization beam apparatus 13 is just
To the input port of Fabry Perot transmission cavity 12, the detection mouth of the delivery outlet face photodetector 11 of transmission cavity 12, photoelectricity is visited
The output for surveying device 11 is connected to the analog input end of data collecting card 10, and data collecting card is communicated with the foundation of computer 9, and data are adopted
Three simulation output ends of truck be connected respectively to control cabinet 5, control cabinet 18, adder 7 input terminal；The output of control cabinet 5
It is connected to the inside piezoelectric ceramics of reference cavity 3, the output of control cabinet 18 is connected to the inside piezoelectric ceramics of reference cavity 22, function letter
The output of number generator 8 is connected to another input terminal of adder 7, and the output of adder is connected to the inside piezoelectricity of transmission cavity 12
Ceramics.Light by beam splitter 14 by being reflected again after half-wave plate 19, subsequently into polarization beam apparatus 13.
Implement frequency-stabilizing method while more ti sapphire lasers, the specific steps of which are as follows:
A. more ti sapphire lasers are passed through into transmission peaks edge frequency locking technology-locking on respective reference cavity, realizes and swashs
Optical linewidth narrows and preliminary Frequency Locking.After opening ti sapphire laser, first by control cabinet to the pressure of reference cavity
The voltage that electroceramics applies even variation (increasing or reducing) is long come the chamber for scanning reference cavity, obtains the transmission peak-to-peak signal of laser,
Then select unlatching control loop as a reference point at the half of any one transmission peaks signal strength, the control loop mainly by
The hysteroscope that two panels in annular chamber 2 (or 21) has piezoelectric ceramics is constituted, caused by any small laser frequency drift thoroughly
It penetrates signal strength and will be fed back to piezoelectric ceramics appended by hysteroscope as error signal relative to the variation of reference point intensity to come pair
Annular chamber is finely adjusted, timely frequency of amendment offset, to realize that laser frequency lock in a certain mode of reference cavity, obtains
Line width is relatively narrow, short-term frequency stability laser, but since the factors such as the change of ambient temperature, the fluctuating of piezoelectric ceramics will make
The length for obtaining reference cavity generates slow drift, so that laser frequency also can generate slow drift as shown in Figure 3 and influence long-term
Stability needs further to take following steps.
B. polarization beam apparatus 13 realizes the reference laser of frequency stabilization and the conjunction beam of all titanium precious stone lasers in frequency stabilization system,
And combined beam light is inputted into Fabry Perot transmission cavity 12.Function signal generator 8 exports triangular voltage sweep voltage and passes through addition
Device 7 is applied on the piezoelectric ceramics of transmission cavity 12, and periodically shuttle-scanning transmits cavity length, the optical signal transmissive of transmission cavity by
Photodetector 11 is changed into electric signal and input data capture card 10 after receiving, which is passed to the data collected and calculates
Machine 9 is intuitively shown optical signal transmissive by the LabVIEW program write in computer, is obtained as shown in Figure 2 containing and is joined
The digital signal of laser and Duo Tai titanium precious stone laser transmission peaks is examined, wherein for the transmission peak-to-peak signal convenient for distinguishing various lasers,
Adjusting first the 6,15, second half-wave plate 19 of half-wave plate respectively keeps the height of the laser transmission peaks of three lasers different.
C. in the LabVIEW program write, the locking of the laser transmission peak position of reference laser diode is realized, it is outer to eliminate
Influence of boundary's factor to the transmission peak position of reference laser.Method be first calculate reference laser transmission peaks (in Fig. 2 a at) and
The distance between the first sampling point (starting point in Fig. 2) of data collecting card (D) (distance can continue slightly because of external interference
Shake), a keyed end position (being denoted as C) is set, by the difference between the real time position and keyed end of the transmission peaks of reference laser
It is worth (D-C) and is used as error signal, proportion of utilization integral algorithm obtains a negative feedback voltage and is output to by data collecting card 10
The feedback voltage is added by adder 7, adder with above-mentioned triangular voltage sweep voltage, the biasing voltage signal as scanning voltage
It is applied to the inside piezoelectric ceramics of transmission cavity 12, so that transmission cavity is locked on reference laser, eliminates environment to reference to sharp
The influence of the transmission peak position of light.Wherein, bias voltage is obtained by following formula:
Uoffset(t)=Ke (t)+I ∑ e (t)
Wherein K, I respectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, and e (t) represents reference
The error signal (D-C) that laser transmission peaks are generated relative to the positional shift of set point.
D. the bias voltage that one is gradually increased by O V is exported by the analog output channel of data collecting card 10 to believe
Number, and the voltage is transmitted to reference cavity 3 through control cabinet 5, which, which persistently increases to 3 inside piezoelectric ceramics of reference cavity, is allowed
Maximum voltage half at until (in the present embodiment be 0.35V), to provide one for the feedback regulation in below step
Biggish initial adjustable extent.It is important to note that the rate of voltage signal increase will (change rate generally should be smaller than slowly enough
0.01V/s), to guarantee not affecting the preliminary reference cavity frequency locking realized in step A.Similarly, from data collecting card 10
Another analog output channel generate the biasing voltage signal that is gradually increased another reference cavity be applied to by another control cabinet 18
22。
The transmission of the calculating of E.LabVIEW program reference laser beam transmission peaks (in Fig. 2 at a) and First ti sapphire laser
The distance between peak (at b) the distance between (X) and two reference laser transmission peaks (Z), setting one are normal between 0 and 1
Number (such as 0.3, it is denoted as C1) and using the difference of ratio X/Z and the constant as error signal, proportion of utilization integral algorithm obtains
One negative feedback voltage is output to control cabinet 5 by data collecting card 10, and control cabinet 5 is applied in reference cavity 3 after amplifying signal
On portion's piezoelectric ceramics, it is steady in a long-term that First laser frequency is realized by real-time negative feedback control.Wherein, negative feedback voltage
It is obtained by following formula:
U1(t)=K1e1(t)+I1∑e1(t)
Wherein K1、I1Respectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, e1(t) is represented
Error signal (the X/Z-C that one titanium precious stone laser transmission peaks is generated relative to the positional shift of reference laser transmission peaks1)。
F. similarly, distance represented by Y and Z in Fig. 2 is calculated, another keyed end that setting is different from step E is normal
Number (such as 0.5, it is denoted as C2) and using the difference of ratio Y/Z and the constant as error signal, proportion of utilization integral algorithm generates negative
Feedback voltage is simultaneously applied on the piezoelectric ceramics of reference cavity 22, to realize that the frequency of second ti sapphire laser is steady for a long time
Fixed, reference cavity 3 and reference cavity 22 export the stable laser of narrow linewidth, long run frequency.
By similar step, which can extend to while realizing third platform, the 4th ... i-th titanium treasured
The laser linewidth of stone laser narrows and long-term frequency stabilization, the specific steps of extension are as follows:
Step 1: with above-mentioned steps A, by i-th ti sapphire laser by transmission peaks edge frequency locking technology-locking at it
On reference cavity, narrowing and preliminary Frequency Locking for its laser linewidth is realized.
Step 2: with above-mentioned steps B, all titanium precious stone lasers and reference laser are closed into beam, input Fabry Perot transmission
Its transmitted light is converted to electric signal and input data capture card and computer via photodetector by chamber, scan transfer chamber.Note
It is intended to that half-wave plate is placed and adjusted in the optical path of i-th ti sapphire laser, makes the height of the laser transmission peaks of this laser
It is different from other transmission peaks.
Step 3: with above-mentioned steps C, the locking of the laser transmission peak position of reference laser diode is realized.
Step 4: with above-mentioned steps D, by the analog output channel of data collecting card 10 export one by O V by
Cumulative big biasing voltage signal, and the voltage is transmitted to its reference cavity through control cabinet.
Step 5: it calculates between reference laser beam transmission peaks (in Fig. 2 at a) and the transmission peaks of i-th ti sapphire laser
Distance (be denoted as Xi) and the distance between two reference laser transmission peaks (Z), it sets another keyed end constant and (is denoted as Ci)
And by ratio XiAs error signal, proportion of utilization integral algorithm generates negative feedback voltage and is applied to the difference of/Z and the constant
On the piezoelectric ceramics of its reference cavity, to realize that the frequency of i-th ti sapphire laser is steady in a long-term.Wherein, negative feedback voltage
It is obtained by following formula:
Ui(t)=Kiei(t)+Ii∑ei(t)
Wherein Ki、IiRespectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, ei(t) is represented
Error signal (the X that i titanium precious stone laser transmission peaks are generated relative to the positional shift of reference laser transmission peaksi/Z-Ci)。
For the actual effect for illustrating above-mentioned frequency stabilization system and frequency-stabilizing method, first measures and do not use frequency stabilization side proposed by the present invention
Method, laserfrequencystability when only ti sapphire laser being locked on reference cavity, as shown in figure 3, the Ti:Sapphire laser in 2 hours
The frequency drift of laser is about 147MHz, i.e. drift speed about per hour 74MHz.
Fig. 4 is to use frequency-stabilizing method proposed by the present invention, while realizing that two ti sapphire laser laser frequencies are steady for a long time
The laserfrequencystability figure of timing, and the thus statistic histogram and gaussian curve approximation of made frequency drift, analysis
The halfwidth of matched curve it can be concluded that, two titanium precious stone laser beam frequencies are stable within the scope of ± 1MHz in 5.5 hours
(respectively ± 0.79MHz and ± 0.73MHz), shows that laser frequency realizes steadily in the long term.Wherein first and second laser frequency
Drift about (δ1、δ2) it is obtained by the following formula respectively:
Wherein λrefAnd λT1、λT2Respectively indicate the wavelength of reference laser and first and second ti sapphire laser laser, FSR
Indicate the free spectrum journey of Fabry Perot transmission cavity 12.
Fig. 5 indicates to realize that two ti sapphire laser laser frequencies are steady for a long time simultaneously using frequency-stabilizing method proposed by the present invention
After fixed, the laser tuning of the two to close frequencies is carried out to the obtained beat signal of beat frequency again, line width is about 12kHz, then
Every ti sapphire laser line width is about 6kHz, shows that its laser linewidth has obtained sufficiently narrowing.
Claims (5)
1. a kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term, which is characterized in that if including several ti sapphire lasers,
Dry reference cavity (3,22), several control cabinets (5,18), the reference laser diode (17) of frequency stabilization, optoisolator (16), half
Wave plate (6,15,19), beam splitter (4,14,23), polarization beam apparatus (13), Fabry Perot transmission cavity (12), photodetector
(11), function signal generator (8), adder (7), data collecting card (10), computer (9), ti sapphire laser output
Laser enters reference cavity (3,22) and carries out linewidth narrowing and preliminary Frequency Locking, by beam splitter (4,23) that laser is a part of
For exporting, another part input polarization beam splitter (13) after half-wave plate (6,19), the reference laser diode (17) of frequency stabilization
The laser of output after optoisolator (16) and half-wave plate (15) also input polarization beam splitter (13) realize titanium precious stone laser with
The conjunction beam of reference laser, the light after closing beam input Fabry Perot transmission cavity (12), and function signal generator (8) passes through addition
Device (7) exports triangular voltage sweep signal function in transmission cavity (12), and the transmitted light of transmission cavity (12) is connect by photodetector (11)
It is changed into electric signal input data capture card (10) after receipts, which is passed to computer (9) for the data collected, through computer
(9) the different feedback control signals generated after the analysis of LabVIEW program and processing write in are by data collecting card (10) point
Supplementary biography transports to adder (7) and control cabinet (5,18), after feedback control signal is added by adder (7) with triangular voltage sweep signal
It is applied to transmission cavity (12), feedback control signal is applied to reference cavity (3,22) by control cabinet (5,18), and reference cavity (3,22) is equal
The stable laser of narrow linewidth, long run frequency is exported, more ti sapphire lasers are existed by transmission peaks edge frequency locking technology-locking
On respective reference cavity, realize that narrowing for laser linewidth is led to that is, after unlatching ti sapphire laser first with preliminary Frequency Locking
It is long come the chamber for scanning reference cavity to cross the voltage that control cabinet applies even variation to the piezoelectric ceramics of reference cavity, obtains the transmission of laser
Then peak-to-peak signal selects unlatching control loop as a reference point, the control ring at the half of any one transmission peaks signal strength
Road is mainly made of the hysteroscope that the two panels in annular chamber has piezoelectric ceramics, caused by any small laser frequency drift thoroughly
It penetrates signal strength and will be fed back to piezoelectric ceramics appended by hysteroscope as error signal relative to the variation of reference point intensity to come pair
Annular chamber is finely adjusted, timely frequency of amendment offset, to realize that laser frequency lock in a certain mode of reference cavity, obtains
Line width is relatively narrow, short-term frequency stability laser, but due to the fluctuating factor of the change of ambient temperature, piezoelectric ceramics will so that
The length of reference cavity generates slow drift.
2. laser frequency according to claim 1 transmission cavity frequency stabilization system steady in a long-term, which is characterized in that the titanium is precious
Stone laser includes pumping source (1,20) and annular chamber (2,21), and the laser of pumping source (1,20) output enters annular chamber (2,21)
Reference cavity (3,22) are inputted after gain, amplification, frequency-selecting carries out linewidth narrowing and preliminary Frequency Locking.
3. a kind of frequency-stabilizing method that laser frequency is steady in a long-term, which is characterized in that utilize transmission peaks edge frequency locking technology and transmission
Chamber Frequency Stabilization Technique, by the reference laser diode and a Fabry Perot transmission cavity of a frequency stabilization, that is, can be achieved at the same time to
The laser linewidth of few two ti sapphire lasers is narrowed to be stablized with long run frequency, while can be locked in respectively two lasers can
On optional frequency in tuning range, steps of the method are:
A. more ti sapphire lasers are passed through into transmission peaks edge frequency locking technology-locking on respective reference cavity, realizes laser rays
Wide narrows and preliminary Frequency Locking；
B. the reference laser of all titanium precious stone lasers and frequency stabilization is closed into beam, inputs Fabry Perot transmission cavity；
Its transmitted light is converted to electric signal and input data capture card and calculating via photodetector by C. scan transfer chamber
Machine；
D. run computer in LabVIEW program, using reference laser transmission peaks relative to set point positional shift as mistake
Difference signal generates bias voltage and is applied to transmission cavity, and transmission cavity is locked on reference laser；
E. slowly apply initial bias at most platform reference cavity；
F. the positional shift using each titanium precious stone laser transmission peaks relative to reference laser transmission peaks generates phase as error signal
The negative feedback voltage real-time effect answered realizes that more laser frequencies are steady in a long-term in respective corresponding reference cavity.
4. laser frequency as claimed in claim 3 frequency-stabilizing method steady in a long-term, which is characterized in that in step A, transmission peaks side
Implementation method along frequency locking technology is to obtain the transmission peak-to-peak signal of titanium precious stone laser by scanning reference cavity first, then select
It is as a reference point at the half of any one transmission peaks signal strength, transmitted signal strength caused by laser frequency drift is opposite
In reference point intensity variation as error signal, feedback regulation annular chamber carrys out timely frequency of amendment offset, thus by laser frequency
Rate is locked in a certain mode of reference cavity, realizes the short-term frequency stability of laser, simultaneously because having selected with very high
The reference cavity of fineness, according to the line width formula below with reference to chamber, the line width of titanium precious stone laser, which also obtains, sufficiently to be narrowed:
Wherein FSR is the free spectrum journey of reference cavity, and Finesse is the fineness of reference cavity.
5. laser frequency as claimed in claim 3 frequency-stabilizing method steady in a long-term, which is characterized in that in the step D of this method
Bias voltage is obtained by following formula:
Uoffset(t)=Ke (t)+I ∑ e (t)
Wherein K, I respectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, and e (t) represents reference laser
The error signal that transmission peaks are generated relative to the positional shift of set point；
Negative feedback voltage is obtained by following formula in the step F of this method:
Ui(t)=Kiei(t)+Ii∑ei(t)
Wherein Ki、IiRespectively represent the proportionality coefficient being manually set in proportional integration algorithm, integral parameter, ei(t) it represents i-th
The error signal that titanium precious stone laser transmission peaks are generated relative to the positional shift of reference laser transmission peaks.
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| CN109616864A (en) * | 2019-01-24 | 2019-04-12 | 中国科学院武汉物理与数学研究所 | A kind of super stabilized laser frequency regulator of knockdown multichannel |
| EP3940898B1 (en) | 2020-07-14 | 2023-06-21 | Alpine Quantum Technologies GmbH | Methods and apparatuses for laser stabilization |
| CN114442009A (en) * | 2021-12-22 | 2022-05-06 | 北京自动化控制设备研究所 | Frequency stabilization method and system of atomic magnetometer based on FP (Fabry-Perot) cavity frequency stabilization |
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| CN104409963A (en) * | 2014-11-05 | 2015-03-11 | 华东师范大学 | Narrow-linewidth and long-time-stable frequency dye laser and frequency stabilization method thereof |
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| CN103887700A (en) * | 2014-03-20 | 2014-06-25 | 中国科学院武汉物理与数学研究所 | Transmission cavity frequency regulator capable of carrying out frequency stabilization on multiple beams of laser |
| CN104409963A (en) * | 2014-11-05 | 2015-03-11 | 华东师范大学 | Narrow-linewidth and long-time-stable frequency dye laser and frequency stabilization method thereof |
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