CN104051946B - Longitudinal Zeeman laser frequency locking method and device based on thermal frequency stabilization and acousto-optic frequency shift - Google Patents
Longitudinal Zeeman laser frequency locking method and device based on thermal frequency stabilization and acousto-optic frequency shift Download PDFInfo
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Abstract
The invention discloses a longitudinal Zeeman laser frequency locking method and device based on thermal frequency stabilization and acousto-optic frequency shift, and belongs to the technical field of laser application. The acousto-optic frequency shift technology is adopted to lock output laser frequencies of a plurality of longitudinal Zeeman lasers based on thermal frequency stabilization on the output laser frequency of the same reference longitudinal Zeeman frequency stabilized laser, and therefore the output lasers of all the lasers have the unified frequency value, the defect that frequency consistency of traditional frequency stabilized lasers is low is overcome, and a novel laser source is provided for ultra-precision laser interference measurement.
Description
Technical field
The invention belongs to laser application technique field, particularly a kind of Zeeman Laser based on hot frequency stabilization and acousto-optic frequency translation swashs
Light locking method and its device.
Background technology
In recent years, the ultra precise measurement with litho machine and Digit Control Machine Tool as representative and process technology are towards large scale, high-precision
Degree, many spatial degrees of freedom synchro measure directions are developed, and total laser power consumption of laser interferometry system are sharply increased, far
More than the output laser power of separate unit frequency stabilized carbon dioxide laser, it is therefore desirable to while being combined measurement using multiple stage frequency stabilized carbon dioxide laser.
However, different frequency stabilized carbon dioxide lasers are had differences at aspects such as frequency traeea-bility, laser wave long value, wave length shift directions, this
To bring that certainty of measurement, wavelength standard and the space coordinatess of laser interferometry system different spaces degree of freedom are inconsistent to ask
Topic, so as to affect the integrated measurement accuracy of whole multi-dimension laser interferometer measuration system.In order to ensure laser interferometry system
Integrated measurement accuracy, it is desirable to which the frequency invariance of the multiple stage frequency stabilized carbon dioxide laser being applied in combination will reach 10-8, therefore frequency stabilized carbon dioxide laser
Between frequency invariance have become one of key issue of ultra precise measurement and Processing Technology Development urgent need to resolve.
The Frequency Stabilized Lasers light source for being applied to laser interferometry system at present mainly has dual vertical mode stable frequency laser, laterally fills in
Graceful frequency stabilized carbon dioxide laser and Zeeman Laser laser instrument etc., this kind of laser instrument is on frequency stabilization benchmark with the mid frequency of Laser gain curve
Used as the reference frequency of path length control, and the mid frequency of Laser gain curve changes with working gas air pressure and discharging condition
Become, and multiple stage frequency stabilized carbon dioxide laser cannot accomplish highly consistent in physical parameter, therefore the presence of the reference frequency of its path length control is poor
It is different, so as to cause the frequency invariance of multiple stage frequency stabilized carbon dioxide laser output laser relatively low, 10 can only be reached-6~10-7。
Poor in order to solve the problems, such as the frequency invariance between frequency stabilized carbon dioxide laser, Harbin Institute of Technology proposes a kind of double
Longitudinal-mode laser frequency-offset-lock method (Chinese Patent Application No. CN200910072517, CN200910072518,
CN200910072519 and CN200910072523), the method is swashed with an iodine stabilizd laser or double-longitudinal-mode laser output
Used as benchmark, remaining multiple stage double-longitudinal-mode laser is locked the frequency of light relative to the certain numerical value of reference frequency offset, from
And make the output laser of multiple stage double-longitudinal-mode laser that there is identical wavelength (frequency), but the method in the locking of laser frequency
During, need to adjust the internal running parameter of laser instrument, on the one hand as the mode for adjusting belongs to Indirect method, the sound of system
Answer speed relatively slow, on the other hand there is some difference due to the characterisitic parameter of each laser instrument, work inside laser instrument
Make changing for parameter and harmful effect may be produced to the frequency stability of laser, serious situation results even in laser instrument mistake
Lock.
The content of the invention
In view of the shortcomings of the prior art, the present invention proposes that a kind of Zeeman Laser based on hot frequency stabilization and acousto-optic frequency translation swashs
Light locking method, its objective is with reference to acousto-optic frequency shifters shift frequency characteristic and hot frequency stabilization Zeeman Laser frequency stabilized carbon dioxide laser it is excellent
Point, provides a kind of consistent wavelength excellent LASER Light Source for Ultra-precision Turning and e measurement technology.Present invention also offers a kind of
Zeeman Laser laser frequency locking device based on hot frequency stabilization and acousto-optic frequency translation.
The purpose of the present invention is achieved through the following technical solutions：
A kind of Zeeman Laser laser locking method based on hot frequency stabilization and acousto-optic frequency translation, the method are comprised the following steps：
(1) power supply with reference to Zeeman Laser frequency stabilized carbon dioxide laser is opened, after preheating and frequency stabilization process, laser instrument is just exported
Two laser components of polarization are handed over, and one of laser components are isolated as with reference to Zeeman Laser frequency stabilization by the use of polarization spectroscope
The output light of laser instrument, its frequency of light wave are designated as νr, this output light is separated into n >=1 tunnel by fiber optic splitter, is designated as light beam Xi,i
=1,2 ..., n, respectively as Zeeman Laser laser instrument Li, i=1,2 ..., the reference beam of n frequency locks；
(2) open Zeeman Laser laser instrument Li, the power supply of i=1,2 ..., n, all Zeeman Laser laser instrument are entered simultaneously
Warm, measures the temperature value of current environment, sets the target temperature T of preheating accordinglyset, and TsetHigher than ambient temperature, profit
The laser tube being positioned in longitudinal magnetic field is heated with electric heater, make the temperature of laser tube tend to predetermined temperature value
TsetAnd thermal equilibrium state is reached, finely tune the current value of electric heater on this basis according to preheating algorithm, make laser tube work in list
Longitudinal mode light output state, the single longitudinal mode light are split into left-handed and two laser components of right-hand circular polarization under longitudinal magnetic field effect,
And from main outfan and the secondary outfan output of laser tube；
(3) Zeeman Laser laser instrument Li, i=1,2 ..., n enter path length control process, laser after warm terminates
The left-handed and right-circularly polarized light Jing quarter wave plates of pipe pair outfan are changed into mutually orthogonal line polarized light, and by Wollaston
Prism is separated, its luminous power Pi 1, i=1,2 ..., n and Pi 2, i=1,2 ..., n is measured by two quadrant photodetector
Go out, path length control module calculates the difference Δ P of the power of two laser componentsi=Pi 1–Pi 2, i=1,2 ..., n, and according to Δ
Pi, the positive and negative and size of i=1,2 ..., n adjusts the current value of electrothermal device, makes Δ Pi, i=1,2 ..., n go to zero, and then make
The frequency of laser tends towards stability numerical value；
(4) the left-handed and right-circularly polarized light of the main outfan of laser tube is changed into two mutually orthogonal lines by quarter wave plate
Polarization laser, and one of linearly polarized laser component is isolated using polarization spectroscope, it is designated as light beam Ti, i=1,2 ..., n,
The light beam Ti, i=1,2 ..., n frequencies are designated as νi, i=1,2 ..., n, light beam Ti, i=1,2 ..., n respectively enters work frequency
Rate is fi, i=1,2 ..., acousto-optic frequency shifters S of ni, i=1,2 ..., n carry out shift frequency, acousto-optic frequency shifters Si, i=1,2 ..., n
The frequency of corresponding output laser is designated as νi+fi, i=1,2 ..., n, acousto-optic frequency shifters Si, i=1,2 ..., n is corresponding defeated
Go out laser and strength ratio is divided into for 9 by spectroscope again:The relatively large part light of 1 two parts light, wherein intensity is designated as output light
Beam Zi, i=1,2 ..., n, respectively as Zeeman Laser laser instrument Li, the output laser of i=1,2 ..., n, intensity are relatively small
Part light is designated as light beam Yi, i=1,2 ..., n；
(5) by light beam Xi, i=1,2 ..., n respectively with light beam Yi, i=1,2 ..., n carries out optical frequency mixing and forms optics bat
Optical beat signal is converted to the signal of telecommunication using photodetector by frequency signal, its frequency values Δ νi=νi+fi–νr, i=1,
2 ..., n are measured by frequency measuring block, the frequency values Δ ν of the optical beat signal that frequency regulation block is obtained according to measurementi,i
=1,2 ..., n calculate light beam Xi, i=1,2 ..., n and Yi, i=1,2 ..., the frequency-splitting ν of nr–νi=fi–Δνi,i
=1,2 ..., n, and by acousto-optic frequency shifters Si, i=1,2 ..., operating frequency f of ni, i=1,2 ..., n is adjusted to νr–νi, i=
1,2 ..., n, so that Zeeman Laser laser instrument Li, i=1,2 ..., n output beam Zi, i=1,2 ..., the frequency of n is equal to ginseng
Examine light beam Xi, the frequency of i=1,2 ..., n, i.e. νi+fi=νr, i=1,2 ..., n；
(6) circulating repetition step (4) to (5), by adjusting acousto-optic frequency shifters Si, i=1,2 ..., operating frequency f of ni,i
=1,2 ..., n make Zeeman Laser laser instrument Li, i=1,2 ..., the output beam Z of ni, i=1,2 ..., the frequency of n is locked all the time
Due to same frequency value νr。
A kind of Zeeman Laser laser frequency locking device based on hot frequency stabilization and acousto-optic frequency translation, including it is laser power supply A (1), steady
Frequency status indicator lamp (2), with reference to Zeeman Laser frequency stabilized carbon dioxide laser (3), polarization spectroscope A (4), fiber optic splitter (5), laser instrument
Power supply A (1) and frequency stabilization status indicator lamp (2) be connected with reference to Zeeman Laser frequency stabilized carbon dioxide laser (3), polarization spectroscope A (4) is put
Put with reference between Zeeman Laser frequency stabilized carbon dioxide laser (3) outfan and fiber optic splitter (5) input, in device, also include n >=1
Individual structure is identical, the Zeeman Laser laser instrument L in parallel relationshipi, i=1,2 ..., n, each of which Zeeman Laser laser instrument
Li, i=1,2 ..., the assembling structure of n is：Laser power supply B (15) is connected with laser tube (6), and laser tube (6) is placed on cylinder
In shape longitudinal magnetic field module (7), its axis is parallel with magnetic direction, and electric heater (13) is wrapped on laser tube (6) outer wall, described
Electric heater (13) input termination path length control module (11), laser tube temperature sensor (12) are sticked on laser tube (6) outer wall,
The laser tube temperature sensor (12) output termination path length control module (11), environment temperature sensor (14) and path length control
Module (11) connects, and quarter wave plate A (8), wollaston prism (9) and two quadrant photodetector (10) are placed sequentially in laser
After pipe (6) pair outfan, the outfan of two quadrant photodetector (10) is connected with path length control module (11), quarter wave plate B
(16) before, polarization spectroscope B (17) and acousto-optic frequency shifters (18) are placed sequentially in the main outfan of laser tube (6), spectroscope (19)
It is placed between acousto-optic frequency shifters (18) and an input of optical-fiber bundling device (20), another of optical-fiber bundling device (20) is defeated
Enter end to be connected with one of the outfan of fiber optic splitter (5), analyzer (21) be placed on the outfan of optical-fiber bundling device (20) and
Between high-speed photodetector (22), high-speed photodetector (22), frequency measuring block (23), frequency regulation block (24),
Acousto-optic frequency shifters (18) are sequentially connected, and frequency-locked state display lamp (25) is connected with frequency regulation block (24).
The invention has the characteristics that and good result：
(1) present invention carries out in parallel frequency lock, all longitudinal directions to multiple Zeeman Laser laser instrument using acousto-optic frequency shifters
Zeeman frequency stabilization laser instrument output laser has unified frequency values, as the high frequency of acousto-optic frequency shifters adjusts resolving power, many
The frequency invariance of individual laser instrument may be up to 10-9, one to two orders of magnitude are improved than existing method, this is to be different from existing skill
One of innovative point of art.
(2) present invention carries out in parallel frequency lock to multiple Zeeman Laser laser instrument using acousto-optic frequency shifters, due to acousto-optic
The higher frequency adjustment response speed of frequency shifter, can effectively suppress the optical maser wavelength that external interference factor causes to drift about and transition,
So as to improve the stability and ambient adaptability of light source, this is the two of the innovative point for being different from prior art.
(3) present invention carries out in parallel frequency lock to multiple Zeeman Laser laser instrument using acousto-optic frequency shifters, due to laser
The frequency adjustment mode of device final output laser belongs to a kind of outside method of adjustment for laser instrument inner laser pipe, because
This will not produce harmful effect to the path length control mechanism of laser tube, be conducive to the stability and frequency stable essence of raising system
Degree, this is the three of the innovative point for being different from prior art.
Description of the drawings
Principle schematics of the Fig. 1 for apparatus of the present invention
Fig. 2 is the schematic diagram of Zeeman Laser laser instrument frequency stabilization structure in apparatus of the present invention
Fig. 3 is the closed loop control function block diagram of Zeeman Laser laser instrument warm in apparatus of the present invention
Fig. 4 is the closed loop control function block diagram of Zeeman Laser laser instrument frequency stabilization process in apparatus of the present invention
Fig. 5 is the closed loop control function block diagram of Zeeman Laser laser frequency locking process in apparatus of the present invention
In figure, 1- laser power supply A, 2- frequency stabilization status indicator lamps, 3- are with reference to Zeeman Laser frequency stabilized carbon dioxide laser, 4- polarizations point
Light microscopic A, 5- fiber optic splitter, 6- laser tubes, 7- cylindrical shape longitudinal magnetic field modules, 8-1/4 wave plate A, 9- wollaston prisms,
10- two quadrant photodetectors, 11- path length control modules, 12- laser tube temperature sensors, 13- electric heaters, 14- ambient temperatures
Sensor, 15 laser power supply B, 16-1/4 wave plate B, 17 polarization spectroscope B, 18 acousto-optic frequency shifters, 19 spectroscopes, 20 optical fiber are closed
Beam device, 21 analyzers, 22 high-speed photodetectors, 23 frequency measuring blocks, 24 frequency regulation blocks, 25 frequency-locked states are indicated
Lamp.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
As depicted in figs. 1 and 2, the Zeeman Laser laser frequency locking in apparatus of the present invention based on hot frequency stabilization and acousto-optic frequency translation is filled
Put, including laser power supply A1, frequency stabilization status indicator lamp 2, with reference to Zeeman Laser frequency stabilized carbon dioxide laser 3, polarization spectroscope A4, optical fiber
Beam splitter 5, laser power supply A1 and frequency stabilization status indicator lamp 2 be connected with reference to Zeeman Laser frequency stabilized carbon dioxide laser 3, polarization spectro
Mirror A4 is placed on reference between 5 input of 3 outfan of Zeeman Laser frequency stabilized carbon dioxide laser and fiber optic splitter, is also included in the device
N >=1 structure is identical, the Zeeman Laser laser instrument L in parallel relationshipi, i=1,2 ..., n, each of which Zeeman Laser swash
Light device Li, i=1,2 ..., the assembling structure of n is：Laser power supply B15 is connected with laser tube 6, and laser tube 6 is placed on cylindrical shape
In longitudinal magnetic field module 7, its axis is parallel with magnetic direction, and electric heater 13 is wrapped on 6 outer wall of laser tube, the electric heater 13
Input termination path length control module 11, laser tube temperature sensor 12 is sticked on 6 outer wall of laser tube, and the laser tube temperature is passed
The output termination path length control of sensor 12 module 11, environment temperature sensor 14 is connected with path length control module 11, quarter wave plate A8,
After wollaston prism 9 and two quadrant photodetector 10 are placed sequentially in 6 secondary outfan of laser tube, two quadrant photodetector
10 outfan is connected with path length control module 11, and quarter wave plate B16, polarization spectroscope B17 and acousto-optic frequency shifters 18 are sequentially placed
Before 6 main outfan of laser tube, spectroscope 19 is placed between acousto-optic frequency shifters 18 and an input of optical-fiber bundling device 20,
One of another input of optical-fiber bundling device 20 and outfan of fiber optic splitter 5 are connected, and analyzer 21 is placed on optical fiber conjunction
Between the outfan and high-speed photodetector 22 of beam device 20, high-speed photodetector 22, the adjustment of frequency measuring block 23, frequency
Module 24, acousto-optic frequency shifters 18 are sequentially connected, and frequency-locked state display lamp 25 is connected with frequency regulation block 24.
In view of device includes multiple structure identical Zeeman Laser frequency stabilized carbon dioxide laser L1,L2,…,Ln, these Zeeman Lasers
The course of work of frequency stabilized carbon dioxide laser is completely the same, below only to one of Zeeman Laser frequency stabilized carbon dioxide laser L1It is operated process
Description, other similar Zeeman Laser frequency stabilized carbon dioxide lasers that these descriptive texts are equally applicable in device.
During start-up operation, laser power supply A1 is opened, preheating and frequency stabilization are entered with reference to Zeeman Laser frequency stabilized carbon dioxide laser 3
Journey, when the above-noted process is finished, enables frequency stabilization status indicator lamp 2, represents to enter with reference to Zeeman Laser frequency stabilized carbon dioxide laser 3 and stablizes work
Make state, its output laser includes two mutually orthogonal components of polarization direction, one of them is taken out using polarization spectroscope A4
Laser components are used as output light, and are coupled into fiber optic splitter 5, are separated into n roads frequency reference light beam, are designated as light beam X1,
X2,…,Xn, its frequency is designated as νr, as Zeeman Laser laser instrument L1,L2,…,LnThe reference frequency of frequency lock.
While frequency stabilization status indicator lamp 2 is enabled, laser tube power supply B15, Zeeman Laser frequency stabilized carbon dioxide laser L are opened1Into
Warm.The mesh that path length control module 11 measures the ambient temperature value for obtaining according to environment temperature sensor 14 and sets preheating
Mark temperature Tset, and TsetHigher than ambient temperature, by TsetAs the reference input of preheating closed-loop control system as shown in Figure 3,
Obtain actual temperature T of laser tube 6 simultaneously with the measurement of laser tube temperature sensor 12realAs feedback signal, path length control mould
Block 11 calculates the difference of the two, and the size of the operating current according to path length control algorithm adjustment electric heater 13, and laser tube 6 is entered
Row heating so as to which temperature tends to default target temperature TsetThermal equilibrium state is reached, on this basis according to preheating algorithm fine setting
The current value of electric heater 13, makes laser tube 6 work in single longitudinal mode light output state, and the single longitudinal mode light divides under longitudinal magnetic field effect
Split for left-handed and two laser components of right-hand circular polarization, and from main outfan and the secondary outfan output of laser tube 6.
After the completion of warm, the switching Zeeman Laser frequency stabilized carbon dioxide laser L of path length control module 111Into path length control mistake
Journey.It is inclined that left-handed and two laser components Jing quarter wave plate A8 of dextrorotation of 6 secondary outfan output of laser tube are changed into mutually orthogonal line
Shake light component, and is separated by wollaston prism 9, its luminous power P1 1And P1 2Measured by two quadrant photodetector 10, by two
The difference Δ P=P of the power of laser components1 1–P1 2As the feed back input amount of frequency stabilization closed-loop control system as shown in Figure 4, reference
Input quantity is set to zero, and path length control module 11 calculates the difference of reference input and feed back input amount, and according to frequency stabilization control
The working current value of algorithm adjustment winding electric heater 13 processed, and then the temperature resonant cavity of adjustment laser tube 6 is long, makes two laser
The power P of component1 1=P1 2, now the frequency of two laser components also tend to stability number.
After frequency stabilization process terminates, laser instrument L1Into frequency lock procedure, it is left-handed and right that 6 main outfan of laser tube is exported
Two circularly polarized laser component Jing quarter wave plate B16 of rotation are changed into mutually orthogonal line polarized light, and by polarization spectroscope B17 point
One of laser components are separated out, used as the input light of acousto-optic frequency shifters 18, its frequency is designated as ν1, the work of acousto-optic frequency shifters 18
Frequency is designated as f1, due to acousto-optic interaction, the frequency of the output laser of acousto-optic frequency shifters 18 is ν1+f1, the light beam is again by light splitting
Mirror 19 is separated into intensity for 9:The relatively large part light of 1 two parts light, wherein intensity is designated as light beam Z1, swash as Zeeman Laser
Light device L1Output laser, the relatively small part light of intensity is designated as light beam Y1, the light beam and light beam X1By 20 coupling of optical-fiber bundling device
Conjunction synthesizes a branch of coaxial beam into optical fiber, and, by optical beat signal is formed after analyzer 21, Jing is at a high speed for the coaxial beam
After photodetector 22 carries out opto-electronic conversion, its frequency values Δ ν1=ν1+f1–νrObtained by the measurement of frequency measuring block 23, and made
For the feed back input amount of frequency lock closed-loop control system as shown in Figure 5, reference input is set to zero, frequency regulation block
24 according to difference DELTA ν of the two1, calculate light beam X1With light beam Y1Frequency-splitting be νr–ν1=f1–Δν1, and by acousto-optic
Driving frequency f of frequency shifter 181It is adjusted to νr–ν1, so that laser instrument L1Output beam Z1Frequency (light beam Z1With light beam Y1Together
Frequency) equal to reference beam X1Frequency νr.After the completion of said frequencies locking process, frequency regulation block 24 enables frequency locking shape
State display lamp 25.
When external environment change or other factorses cause with reference to Zeeman Laser frequency stabilized carbon dioxide laser 3 or Zeeman Laser laser instrument
L1When the frequency of output laser changes, the above-mentioned frequency stabilization locking process of Automatic Cycle, by the work for adjusting acousto-optic frequency shifters 18
Working frequency f1, make Zeeman Laser laser instrument L1Frequency ν of output laser1All the time it is locked in reference frequency νr.In the same manner, Zeeman Laser
Laser instrument L2,L3,…,LnFrequency ν of output laser2,ν3,…,νnAlso reference frequency ν is locked in all the timerOn.
Claims (2)
1. a kind of Zeeman Laser laser locking method based on hot frequency stabilization and acousto-optic frequency translation, it is characterised in that the method includes following
Step：
(1) power supply with reference to Zeeman Laser frequency stabilized carbon dioxide laser is opened, after preheating and frequency stabilization process, laser instrument output orthogonal is inclined
Two laser components for shaking, isolate one of laser components as with reference to Zeeman Laser Frequency Stabilized Lasers by the use of polarization spectroscope
The output light of device, its frequency of light wave are designated as νr, this output light is separated into n >=1 tunnel by fiber optic splitter, is designated as light beam Xi, i=1,
2 ..., n, respectively as Zeeman Laser laser instrument Li, i=1,2 ..., the reference beam of n frequency locks；
(2) open Zeeman Laser laser instrument Li, the power supply of i=1,2 ..., n, all Zeeman Laser laser instrument enter preheated simultaneously
Journey, measures the temperature value of current environment, sets the target temperature T of preheating accordinglyset, and TsetHigher than ambient temperature, using electric heating
Device is heated to the laser tube being positioned in longitudinal magnetic field, makes the temperature of laser tube tend to predetermined temperature value TsetAnd
Thermal equilibrium state is reached, the current value of electric heater is finely tuned on this basis according to preheating algorithm, is made laser tube work in single longitudinal mode
Light output state, the single longitudinal mode light are split into left-handed and two laser components of right-hand circular polarization under longitudinal magnetic field effect, and from
The main outfan of laser tube and secondary outfan output；
(3) Zeeman Laser laser instrument Li, into path length control process after warm terminates, laser tube pair is defeated for i=1,2 ..., n
The left-handed and right-circularly polarized light Jing quarter wave plates for going out end are changed into mutually orthogonal line polarized light, and are entered by wollaston prism
Row is separated, its luminous power Pi 1, i=1,2 ..., n and Pi 2, i=1,2 ..., n drawn by two quadrant photodetector measurement, frequency stabilization
Control module calculates the difference Δ P of the power of two laser componentsi=Pi 1–Pi 2, i=1,2 ..., n, and according to Δ Pi, i=1,
The positive and negative and size of 2 ..., n adjusts the current value of electrothermal device, makes Δ Pi, i=1,2 ..., n go to zero, and then make laser
Frequency tends towards stability numerical value；
(4) the left-handed and right-circularly polarized light of the main outfan of laser tube is changed into two mutually orthogonal linear polarizations by quarter wave plate
Laser, and one of linearly polarized laser component is isolated using polarization spectroscope, it is designated as light beam Ti, i=1,2 ..., n are described
Light beam Ti, i=1,2 ..., n frequencies are designated as νi, i=1,2 ..., n, light beam Ti, i=1,2 ..., n respectively enters operating frequency and is
fi, i=1,2 ..., acousto-optic frequency shifters S of ni, i=1,2 ..., n carry out shift frequency, acousto-optic frequency shifters Si, i=1,2 ..., n correspondences
Output laser frequency be designated as νi+fi, i=1,2 ..., n, acousto-optic frequency shifters Si, i=1,2 ..., the corresponding outputs of n swash
Light is divided into strength ratio for 9 by spectroscope again:The relatively large part light of 1 two parts light, wherein intensity is designated as output beam Zi,
I=1,2 ..., n, respectively as Zeeman Laser laser instrument Li, the output laser of i=1,2 ..., n, the relatively small part of intensity
Light is designated as light beam Yi, i=1,2 ..., n；
(5) by light beam Xi, i=1,2 ..., n respectively with light beam Yi, i=1,2 ..., n carries out optical frequency mixing and forms optical beat letter
Number, optical beat signal is converted to into the signal of telecommunication using photodetector, its frequency values Δ νi=νi+fi–νr, i=1,2 ..., n
Measured by frequency measuring block, the frequency values Δ ν of the optical beat signal that frequency regulation block is obtained according to measurementi, i=1,
2 ..., n, calculate light beam Xi, i=1,2 ..., n and Yi, i=1,2 ..., the frequency-splitting ν of nr–νi=fi–Δνi, i=1,
2 ..., n, and by acousto-optic frequency shifters Si, i=1,2 ..., operating frequency f of ni, i=1,2 ..., n is adjusted to νr–νi, i=1,
2 ..., n, so that Zeeman Laser laser instrument Li, i=1,2 ..., n output beam Zi, i=1,2 ..., the frequency of n is equal to reference
Light beam Xi, the frequency of i=1,2 ..., n, i.e. νi+fi=νr, i=1,2 ..., n；
(6) circulating repetition step (4) to (5), by adjusting acousto-optic frequency shifters Si, i=1,2 ..., operating frequency f of ni, i=1,
2 ..., n, make Zeeman Laser laser instrument Li, i=1,2 ..., the output beam Z of ni, i=1,2 ..., the frequency of n is locked in all the time
Same frequency value νr。
2. a kind of Zeeman Laser laser frequency locking device based on hot frequency stabilization and acousto-optic frequency translation, including laser power supply A (1), frequency stabilization
Status indicator lamp (2), with reference to Zeeman Laser frequency stabilized carbon dioxide laser (3), polarization spectroscope A (4), fiber optic splitter (5), laser instrument electricity
Source A (1) and frequency stabilization status indicator lamp (2) be connected with reference to Zeeman Laser frequency stabilized carbon dioxide laser (3), polarization spectroscope A (4) place
With reference between Zeeman Laser frequency stabilized carbon dioxide laser (3) outfan and fiber optic splitter (5) input, it is characterised in that in device also
, Zeeman Laser laser instrument L in parallel relationship identical including n >=1 structurei, i=1,2 ..., n, each of which longitudinally fill in
Graceful laser instrument Li, i=1,2 ..., the assembling structure of n is：Laser power supply B (15) is connected with laser tube (6), and laser tube (6) is put
Put in cylindrical shape longitudinal magnetic field module (7), its axis is parallel with magnetic direction, electric heater (13) is wrapped in laser tube (6) outward
On wall, the electric heater (13) input termination path length control module (11), laser tube temperature sensor (12) stick to laser tube
(6) on outer wall, the laser tube temperature sensor (12) output termination path length control module (11), environment temperature sensor (14)
It is connected with path length control module (11), quarter wave plate A (8), wollaston prism (9) and two quadrant photodetector (10) are successively
After being placed on laser tube (6) pair outfan, the outfan of two quadrant photodetector (10) is connected with path length control module (11),
Before quarter wave plate B (16), polarization spectroscope B (17) and acousto-optic frequency shifters (18) are placed sequentially in the main outfan of laser tube (6), point
Light microscopic (19) is placed between acousto-optic frequency shifters (18) and an input of optical-fiber bundling device (20), optical-fiber bundling device (20)
One of another input and outfan of fiber optic splitter (5) are connected, and analyzer (21) is placed on optical-fiber bundling device (20)
Between outfan and high-speed photodetector (22), high-speed photodetector (22), frequency measuring block (23), frequency adjustment mould
Block (24), acousto-optic frequency shifters (18) are sequentially connected, and frequency-locked state display lamp (25) is connected with frequency regulation block (24).
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| CN201410308229.1A CN104051946B (en) | 2014-07-01 | 2014-07-01 | Longitudinal Zeeman laser frequency locking method and device based on thermal frequency stabilization and acousto-optic frequency shift |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4096448A (en) * | 1977-01-12 | 1978-06-20 | Rockwell International Corporation | Phase-locking of independent laser oscillators |
| WO1988001799A1 (en) * | 1986-08-30 | 1988-03-10 | Renishaw Plc | Frequency stabilised laser and control system therefor |
| US4817099A (en) * | 1986-10-06 | 1989-03-28 | Laser Science, Inc. | Generation of stable frequency radiation at an optical frequency |
| US5018151A (en) * | 1981-05-29 | 1991-05-21 | Seaton Norman T | Laser control apparatus and method for frequency offset phase locking and the minimizing of retro-reflection effects |
| CN101039010A (en) * | 2007-04-27 | 2007-09-19 | 中国科学院上海光学精密机械研究所 | Method for controlling cavity length of seed injection laser driven cavity and its laser |
| CN101615755A (en) * | 2009-07-17 | 2009-12-30 | 哈尔滨工业大学 | Double-longitudinal-mode laser heat frequency-stabilizing method and device based on iodine frequency stabilization reference light |
-
2014
- 2014-07-01 CN CN201410308229.1A patent/CN104051946B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4096448A (en) * | 1977-01-12 | 1978-06-20 | Rockwell International Corporation | Phase-locking of independent laser oscillators |
| US5018151A (en) * | 1981-05-29 | 1991-05-21 | Seaton Norman T | Laser control apparatus and method for frequency offset phase locking and the minimizing of retro-reflection effects |
| WO1988001799A1 (en) * | 1986-08-30 | 1988-03-10 | Renishaw Plc | Frequency stabilised laser and control system therefor |
| US4817099A (en) * | 1986-10-06 | 1989-03-28 | Laser Science, Inc. | Generation of stable frequency radiation at an optical frequency |
| CN101039010A (en) * | 2007-04-27 | 2007-09-19 | 中国科学院上海光学精密机械研究所 | Method for controlling cavity length of seed injection laser driven cavity and its laser |
| CN101615755A (en) * | 2009-07-17 | 2009-12-30 | 哈尔滨工业大学 | Double-longitudinal-mode laser heat frequency-stabilizing method and device based on iodine frequency stabilization reference light |
Non-Patent Citations (2)
| Title |
|---|
| A laser polarization state-measurement method based on the beat amplitude characteristic;Jiubin Tan et al.;《Measurement Science and Technology》;20110701;第22卷(第8期);085302-1-085302-7 * |
| Method for in situ-calibration of multiple feedback interferometers;谈宜东 等;《Chinese Optics Letters》;20131010;第11卷(第10期);102601-1-102601-3 * |
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