CN1138323C - Dual-refraction dual-frequency Zeeman laser device with stable frequency difference and its method for stabilizing frequency difference - Google Patents
Dual-refraction dual-frequency Zeeman laser device with stable frequency difference and its method for stabilizing frequency difference Download PDFInfo
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- CN1138323C CN1138323C CNB011343389A CN01134338A CN1138323C CN 1138323 C CN1138323 C CN 1138323C CN B011343389 A CNB011343389 A CN B011343389A CN 01134338 A CN01134338 A CN 01134338A CN 1138323 C CN1138323 C CN 1138323C
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000000087 stabilizing effect Effects 0.000 title abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000006641 stabilisation Effects 0.000 claims description 27
- 238000011105 stabilization Methods 0.000 claims description 27
- 230000003321 amplification Effects 0.000 claims description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 16
- 230000005622 photoelectricity Effects 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003416 augmentation Effects 0.000 abstract 2
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical class [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 229910001374 Invar Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
The present invention discloses a method for stabilizing frequency difference of a zeeman dual-refraction dual-frequency laser with stable frequency difference, which relates to a structure of a helium-neon zeeman dual-refraction dual-frequency laser and a method for stabilizing frequency difference thereof. The present invention is characterized in that on the basis that reliable and suitable frequency difference is obtained by applying a two-dimensional thrust augmentation ring, computer control is utilized for stabilizing the frequency difference by stabilizing the frequency of a laser. In the present invention, a two-dimensional force application mode replaces the original one-dimensional force application mode, so materials of the thrust augmentation ring are optimized and selected, and meanwhile, a frequency-stabilizing device for the laser is added; the drift of frequency difference of the laser is further reduced, the reliability of the device and the stability of the frequency are improved, and the laser enters a period of practical application.
Description
Technical field
The present invention relates to a kind of laser, particularly a kind of structure of He-Ne Zeeman-birefringence double-frequency laser reaches the method for implementing frequency stabilization at this kind laser.
Background technology
At present a kind of " birefringence double-frequency laser and the frequency difference accuracy control method thereof that do not have the frequency difference locking " that proposes in the prior art (Chinese patent: application number: 99103513.5), this two-frequency laser by laser gain pipe, one dimension force application apparatus, add transverse magnetic field and form.This technology has solved two-frequency laser and can not export greater than the problem of 3 megahertzes less than the difference on the frequency of 40 megahertzes, thereby has broken through the restriction of existing two-frequency laser interferometer on measuring speed, on the invention history of two-frequency laser significance is arranged.Be fit to the suitable frequency difference that two-frequency laser interferometer is used though this kind laser can be exported, its frequency difference stability can't reach the specific requirement of commercial Application.The difference on the frequency of Zeeman-birefringence double-frequency laser still has drift phenomenon, its reason has with three aspects: the one, when changing because of ambient temperature, (half inner chamber is anti-reflection window for afterburning ring and photoelastic components, full inner chamber is the output window) all can expand with heat and contract with cold, if but different, the coefficient of linear expansion difference of material of afterburning ring and photoelastic components, the size of heat expansion and shrinkage is also different.As the reinforcing ring is that (linear expansion coefficient is about 5 * 10 to invar
-7), window materials are that (linear expansion coefficient is about 4 * 10 to K9 glass
-5), the diameter of window fast than the diameter expansion of invar during intensification, afterburning ring strengthens the pressure of window, causes that the internal stress of window becomes big, and birefringence effect is strengthened, and it is big that difference on the frequency becomes, and vice versa.The variable quantity of Yin Ruing is at several MHz thus.It two is that the force application apparatus to photoelastic components is the afterburning mode of one dimension in existing Zeeman-birefringence double-frequency laser, because the frequency difference of this kind laser is directly proportional with the stress of generation in the photoelastic components, so when need producing less frequency difference institute to add stress also less, this makes the relative photoelastic components of augmentor loosening easily, poor reliability.Its three, along with the laser shell heats up, laser chamber is long elongated, two frequencies of laser will produce drift, inswept gain line because backlash, difference on the frequency will change several KHz.
Summary of the invention
The objective of the invention is on the basis of above-mentioned patented technology, stable Zeeman birefringence double-frequency laser of a kind of difference on the frequency and difference on the frequency antihunt means thereof are proposed, to overcome existing Zeeman birefringence double-frequency laser difference on the frequency drifting problem, reach the purpose of while stabilized frequency difference and frequency, improve the reliability of device, but make this laser enter practical stage.
The objective of the invention is to be achieved through the following technical solutions:
The difference on the frequency antihunt means of Zeeman-birefringence double-frequency laser that a kind of difference on the frequency is stable, the method is characterized in that by using two-dimensional force-adding ring and obtain on the basis of reliable suitable frequency difference, utilize computer control to come stabilized frequency poor by the stable laser frequency again, the step of its method is as follows:
(1). perpendicular to the reinforcing of light beam diameter, promptly adopt two-dimentional force mechanism on a pair of mutually orthogonal diametric(al) of the photoelastic components in laserresonator, it is poor to obtain reliable suitable frequency;
(2). the material of preferred force application apparatus, make the relation that should satisfy matched seal between itself and the photoelastic components material, make the coefficient of linear expansion of its coefficient of linear expansion and photoelastic components material differ 0～10%;
(3). be provided with one by computer-controlled difference on the frequency stabilizing arrangement on above-mentioned laser, this device is at first surveyed the O light and the E light two-way light intensity of separating through wollaston prism by photodetector, accepts module by photoelectricity and changes light signal into the signal of telecommunication;
(4). above-said current signal enters computer by the AD conversion and gathers in real time, as calculated the control signal of output isocandela method or extreme value lock method behind the machine sequential operation;
(5). above-mentioned control signal is changed to the piezoelectricity amplification module by DA, driven the frequency stabilization executive component, finish the frequency stabilization SERVO CONTROL by the frequency stabilization executive component at last through voltage amplification.
A kind of stable Zeeman-birefringence double-frequency laser of difference on the frequency of realizing said method, comprise a He-Ne (He-Ne) laser gain pipe, and laserresonator in photoelastic components and on force application apparatus, mirror lens, quartz packaged shell and outside and magnetic stripe that arrange up and down forms adds transverse magnetic field by being arranged on the quartz packaged shell is characterized in that described afterburning ring is the two-dimensional force-adding ring that has afterburning screw; For difference on the frequency drift and the raising frequency stability that further reduces this kind laser, above-mentioned laser also increases a frequency regulator, and this device is made up of wollaston prism, photodetector, photoelectricity receiver module, piezoelectricity amplification module, frequency stabilization executive component and computer that AD/DA data collecting card and Control Software be housed; The output of described photodetector links to each other with the input of photoelectricity receiver module, the output of photoelectricity receiver module links to each other with the AD of data collecting card end, the DA end of data collecting card links to each other with the input of piezoelectricity amplification module, and the output of piezoelectricity amplification module links to each other with the frequency stabilization executive component.
But it is to be made by the corresponding to valve of the coefficient of linear expansion of its coefficient of linear expansion and photoelastic components that the technology of the present invention feature also is described two-dimensional force-adding ring.
Above-mentioned two-dimensional force-adding ring can adopt circle, the square reinforcing ring that maybe can apply other shape of a pair of mutually orthogonal diametric(al) diameter reinforcing to photoelastic components.
When the laserresonator of above-mentioned laser was half chamber, described frequency stabilization executive component adopted piezoelectric ceramic; When laserresonator was full chamber, the frequency stabilization executive component adopted heater strip.
The present invention is owing to replace original one dimension force mechanism with two-dimentional force mechanism, and the material of reinforcing ring carried out optimizing chosen, increased the laser frequency regulator simultaneously, thereby further reduced the difference on the frequency drift of this kind laser, and improved the reliability of this device and the stability of frequency, but make this laser enter the stage of practical application.
Description of drawings:
Fig. 1 is that Zeeman of the present invention-birefringence double-frequency laser light intensity is with the long tuning curve schematic diagram in chamber
Fig. 2 is embodiments of the invention, the structural representation when promptly afterburning ring adopts circle.
Fig. 3 is an another embodiment of the present invention, and promptly afterburning ring adopts square structural representation.
Fig. 4 is afterburning ring mounting structure generalized section.
Fig. 5 is the structural representation that has the Zeeman-birefringence double-frequency laser of frequency regulator.
Fig. 6 is a photoelectricity receiver module circuit diagram
Fig. 7 is the voltage amplification module circuit diagram.
Fig. 8 is the Control Software program flow chart.
Embodiment
Describe principle of the present invention, structure in detail, specifically implement and optimal way below in conjunction with accompanying drawing:
Force mechanism among the present invention is two-dimentional force mechanism, promptly on a pair of mutually orthogonal diametric(al) of photoelastic components perpendicular to the reinforcing of light beam diameter, we claim that this force application apparatus is a two-dimensional force-adding ring, can adopt circle (as shown in Figure 2) or square (as shown in Figure 3) and other can apply the reinforcing ring of other shapes of a pair of mutually orthogonal diametric(al) diameter reinforcing to photoelastic components.In two orthogonal diametrical position of circular afterburning ring and in the center of the four edges of square afterburning ring four screws are arranged respectively, each screw is furnished with one piece of tack jackscrew to the photoelastic components reinforcing that is positioned at ring.Laser beam is by this photoelastic components, and the frequency difference that laser produced is directly proportional with orthogonal two stress differences that add force direction, and it can be expressed as,
Δ v is a laser output frequency difference in the formula, Δ n
1, Δ n
2Be two principal directions of stress principal refractive index, n
0Be the refractive index of photoelastic components, p
12, p
11Be strain optical coefficient tensor, s
1, s
2Be the principal strain tensor.This novel two-dimentional force application apparatus obtains little frequency difference by little stress difference is provided, and this makes us can apply enough big power when obtaining little frequency difference, and is loosening to prevent afterburning ring, guarantees reliability.
In order to overcome the drift of resonant cavity elongation shortening process intermediate frequency rate variance, the present invention obtains on the basis of reliable suitable frequency difference using two-dimensional force-adding ring, realizes that by computer control the stable laser frequency comes stabilized frequency poor.The present invention also comprises Zeeman-birefringence double-frequency laser is carried out frequency stabilization, and is poor with stabilized frequency.The existing dual-frequency laser source that is widely used in two-frequency laser interferometer mostly is vertical double-frequency zeeman laser device, and uses the hot frequency stabilization of isocandela method more.Because left-handed rotation and right-handed rotation gain line are about the centre frequency symmetry in the longitudinal Zeeman effect, the isocandela point is positioned at centre frequency place and unique, so the isocandela method is simple.Because the laser among the present invention is under the transverse zeeman effect effect, the gain line of the light of two kinds of frequencies (O light and E light) provides gain by π component 1 in the transverse zeeman effect and σ component 2 respectively as shown in Figure 1.At such gain curve, no matter full inner chamber still is the Zeeman-birefringence double-frequency laser of half inner chamber, the problem that the present invention exists the frequency stabilization point to choose to its frequency-stabilizing method, and all can take two kinds of methods, be isocandela method and light intensity extreme value lock method, wherein light intensity extreme value lock method also is divided into π auroral poles value lock method and σ light depression lock method.Thereby two kinds of frequency-stabilizing methods all are to stablize the method that the light intensity stabilized frequency reaches the stabilized frequency difference.The isocandela method is on frequency lock in two positions that two mould light intensity equate (3 or 4 points); π auroral poles value lock method is at the maximum place of π gain line (5 point) frequency lock; σ light depression lock method is at the minimum place of σ gain line (6 point) frequency lock.The frequency of isocandela method is not or not the centre frequency place, and the frequency of extreme value lock method is in centre frequency.
Embodiment 1:
Embodiment 1:
Two-dimensional force-adding ring is that example is illustrated to adopt circular 7 (as shown in Figure 2) or square 10 (as shown in Figure 3).Afterburning ring 7 is fastened on the output window 13 of full intracavity laser by four tack jackscrews 8, or on the anti-reflection window 9 of half-intracavity laser.Obtain the frequency difference that needs and afterburning ring is fixed on the window by the degree of tightness of adjusting jackscrew.With epoxy resin jackscrew and window, jackscrew and afterburning ring are cemented respectively then, so just can guarantee its reliability.But afterburning ring all is the coefficient of linear expansion valve consistent with the coefficient of linear expansion of anti-reflection window with the material of jackscrew.This metal and photoelastic components material k4 should satisfy the relation of matched seal between the glass, promptly the coefficient of linear expansion of two kinds of materials differs and should can guarantee the consistency that they expand and shrink less than 10%.Augmentor structure after cementing as shown in Figure 4, wherein 11 is laser gain pipe.
Fig. 5 is the structural representation that the half inner chamber Zeeman-birefringence double-frequency laser system of frequency difference stabilizing arrangement is housed.It mainly comprise by laser gain pipe 11, anti-reflection window 9, speculum 16, two-dimensional force-adding ring 7, the quartzy shell 12 of encapsulation and and outside and magnetic stripe 14 that arrange up and down forms adds half inner chamber Zeeman-birefringence double-frequency laser and the frequency regulator that transverse magnetic field constitutes by being arranged on the quartz packaged shell, this frequency regulator is by wollaston prism 18, photodetector 19, photoelectricity receiver module 21, AD/DA data collecting card 24, the computer 25 of Control Software is housed, and piezoelectricity amplification module 22 and piezoelectric ceramic 17 are formed.In actual applications, photoelectricity receiver module 21 and piezoelectricity amplification module 22 are integrated and are assembled in the control electronic box 23; AD/DA data collecting card 24 and Control Software then are installed in the computer 25.Photodetector adopts silicon photocell, and data collecting card is 12 precision (the middle safe PC6333 of company), and the voltage amplification scope can reach 0～300V.During frequency stabilization work, by computer control, survey the O light and the E light two-way light intensity of separating and send into photoelectricity and accept module PHOTOINPUT end by photodetector through wollaston prism, this signal amplifies through the photoelectricity receiver module, filtering is exported to data collecting card by the OUTPUT end, entering computer by the AD conversion gathers in real time, export the control signal of isocandela method or extreme value lock method as calculated behind the machine sequential operation, output to piezoelectricity amplification module INPUT end by the DA conversion again, by output of OUTPUT end and drive pressure electroceramics, finish the frequency stabilization SERVO CONTROL by piezoelectric ceramic through voltage amplification at last.Thereby, come stabilized frequency poor by the stable laser frequency.Frequency stability is better than 1 * 10
-7The commercial Application requirement, the difference on the frequency stability can reach 1 * 10
-4More than.
The frequency stabilization system of present embodiment is all realized having stronger versatility by software control in the judgement of the selection of frequency-stabilizing method, frequency stabilization point and control signal optimization.Software is judged the frequency stabilization point by the gain curve shape.When frequency stabilization began, it is long that preset voltage drive pressure electroceramics scans laser chamber, gathers and write down respectively two contiguous mean values of two-way light intensity in real time, calculates the slope of two gain curves at this point respectively.By the logic determines of software, the isocandela method equates frequency stabilization to the place in the two-way light intensity, and distinguishes and 4 points at 3 by slope, and the extreme value lock method is 1 place, i.e. 5 or 6 points with frequency stabilization in light intensity extreme value and slope.Control Software comprises digital PID program link, and the output control signal is optimized processing.
In addition, carry out frequency stabilization for full inner chamber Zeeman-birefringence double-frequency laser, native system is as long as change executive component, is about to piezoelectric ceramic and is replaced by heating wire and can uses.
Claims (5)
1. the difference on the frequency antihunt means of the stable Zeeman-birefringence double-frequency laser of a difference on the frequency, the method is characterized in that by using two-dimensional force-adding ring and obtain on the basis of reliable suitable frequency difference, utilize computer control to come stabilized frequency poor by the stable laser frequency again, the step of its method is as follows:
(1). perpendicular to the reinforcing of light beam diameter, promptly adopt two-dimentional force mechanism on a pair of mutually orthogonal diametric(al) of the photoelastic components in laserresonator, it is poor to obtain reliable suitable frequency;
(2). the material of preferred force application apparatus, make the relation that should satisfy matched seal between itself and the photoelastic components material, make the coefficient of linear expansion of its coefficient of linear expansion and photoelastic components material differ 0～10%;
(3). be provided with one by computer-controlled frequency regulator on above-mentioned laser, this device is at first surveyed 0 light and the E light two-way light intensity of separating through wollaston prism by photodetector, accepts module by photoelectricity and changes light signal into the signal of telecommunication;
(4). above-said current signal enters computer by the AD conversion and gathers in real time, as calculated the control signal of output isocandela method or extreme value lock method behind the machine sequential operation;
(5). above-mentioned control signal is changed to the piezoelectricity amplification module by DA, driven the frequency stabilization executive component, finish the frequency stabilization SERVO CONTROL by the frequency stabilization executive component at last through voltage amplification.
2. adopt the stable Zeeman-birefringence double-frequency laser of a kind of difference on the frequency of method according to claim 1, comprise a He-Ne Lasers gain tube (11), and laserresonator in photoelastic components (9) and on force application apparatus, mirror lens (16), quartz packaged shell (12) and outside and magnetic stripe (14) that arrange up and down forms adds transverse magnetic field by being arranged on the quartz packaged shell, it is characterized in that: described augmentor is the two-dimensional force-adding ring that has afterburning screw; This laser has also increased a frequency regulator, this device is by wollaston prism (18), photodetector (19), photoelectricity receiver module (21), piezoelectricity amplification module (22), frequency stabilization executive component (17) and the computer (25) that AD/DA data collecting card (24) and PID Control Software be housed are formed, the output of described photodetector links to each other with the input of photoelectricity receiver module, the output of photoelectricity receiver module links to each other with the AD of data collecting card end, the DA end of data collecting card links to each other with the input of piezoelectricity amplification module, and the output of piezoelectricity amplification module links to each other with the frequency stabilization executive component.
3. according to the described two-frequency laser of claim 2, it is characterized in that: but described two-dimensional force-adding ring is to be made by the corresponding to valve of the coefficient of linear expansion of its coefficient of linear expansion and photoelastic components.
4. according to claim 2 or 3 described a kind of two-frequency lasers, it is characterized in that: described two-dimensional force-adding ring is circular, the square reinforcing ring that maybe can apply other shape of a pair of mutually orthogonal diametric(al) diameter reinforcing to photoelastic components.
5. according to the described a kind of two-frequency laser of claim 2, it is characterized in that: when laserresonator was half chamber, described frequency stabilization executive component adopted piezoelectric ceramic, and when laserresonator was full chamber, the frequency stabilization executive component adopted heater strip.
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| CNB011343389A CN1138323C (en) | 2001-10-31 | 2001-10-31 | Dual-refraction dual-frequency Zeeman laser device with stable frequency difference and its method for stabilizing frequency difference |
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Cited By (1)
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| CN1333258C (en) * | 2004-06-25 | 2007-08-22 | 清华大学 | Self-mixed intervention Doppler velometer based on two-frequency laser |
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| CN102607814B (en) * | 2012-03-27 | 2014-10-22 | 清华大学 | Detection device for anisotropy of optical element |
| CN104051942A (en) * | 2014-07-01 | 2014-09-17 | 哈尔滨工业大学 | Longitudinal Zeeman laser frequency locking method and device based on thermoelectric refrigeration and acousto-optic frequency shift |
| CN104167660B (en) * | 2014-08-07 | 2017-04-26 | 华中科技大学 | Control method and system of laser set |
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| CN106524898B (en) * | 2016-11-21 | 2019-12-13 | 北京镭测科技有限公司 | Frequency stabilizing device and method for output frequency difference of double-frequency laser |
| CN111786255B (en) * | 2020-08-04 | 2024-04-19 | 中国工程物理研究院总体工程研究所 | Frequency-stabilizing and light-stabilizing intensity double-piezoelectric ceramic tuning external cavity semiconductor laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1333258C (en) * | 2004-06-25 | 2007-08-22 | 清华大学 | Self-mixed intervention Doppler velometer based on two-frequency laser |
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