CN110676681A - Novel HCN laser cavity length adjustment mechanism - Google Patents
Novel HCN laser cavity length adjustment mechanism Download PDFInfo
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- CN110676681A CN110676681A CN201910809244.7A CN201910809244A CN110676681A CN 110676681 A CN110676681 A CN 110676681A CN 201910809244 A CN201910809244 A CN 201910809244A CN 110676681 A CN110676681 A CN 110676681A
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- 239000000919 ceramic Substances 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 abstract 3
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
Abstract
The invention discloses a novel HCN laser cavity length adjusting mechanism which comprises a stepping motor, a high-precision differential head and piezoelectric ceramics, wherein the stepping motor is connected to the high-precision differential head, the high-precision differential head is connected with a vacuum flange through a bellows spring, the vacuum flange is connected with an insulating flange with the same size, the insulating flange is connected to a laser cathode sealing gland, 6 vacuum lead columns are processed on the cathode sealing gland, the front end of the high-precision differential head is connected with a screw rod which penetrates out of the center of the cathode sealing gland, the screw rod is directly connected with a packaging column-shaped piezoelectric ceramics, and the front end of the piezoelectric ceramics is connected with a plane reflector. The mechanism of the invention can provide output power regulation with the precision of 2m and difference frequency regulation with the precision of 10nm for the HCN twin laser, and provides guarantee for continuous and stable output of the HCN twin laser.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a novel cavity length adjusting mechanism of an HCN laser.
Background
Far infrared laser interferometers have been widely used in tokamak devices for detecting plasma density, while in EAST, HT-7 and J-TEXT devices, etc., HCN laser interferometers have been used. The HCN laser interferometer is an external plug-in Mach-Zehnder interferometer, which needs frequency modulation to generate a difference frequency signal, while the dual laser method is an excellent method for frequency modulation. For a twin laser, maintaining good stability of its output power and difference frequency is critical for twin laser applications. The output power and difference frequency of the HCN twin laser are adjusted by changing the cavity length of the discharge cavity of the laser, and the cavity length is adjusted by adjusting the horizontal displacement of the plane reflector of the cathode through an adjusting mechanism, so that the cavity length adjusting mechanism of the laser is a core component for ensuring the stable output of the twin laser.
In the prior art, Journal articles j.b.zhang, y.x.jie, h.q.liu, x.c.wei, et al.outputpower stability of a HCN laser using for the EAST interferometer system, Journal of insulation, November 11,2015, introduce that the current HCN single laser cathode cavity tuning mechanism with push rod is controlled by using an electric platform on EAST tokamak, but the whole device has many parts and is complex to install, and the tuning precision cannot meet the requirement of HCN double laser difference frequency tuning. Journal articles g.li, x.c.wei, h.q.liu, Development of an HCN dual laser for the interferometer on EAST, plasma science and Technology, vol.19, jun.20,2017 introduce preliminary experiments on the difference frequency adjustment of HCN dual lasers using a piezoelectric ceramic micro-displacement stage, and have achieved certain results, but no combination of output power adjustment and difference frequency adjustment is made, and the adjustment accuracy needs to be further improved.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a novel HCN laser cavity length adjusting mechanism.
The invention is realized by the following technical scheme:
a novel HCN laser cavity length adjusting mechanism comprises a stepping motor, a high-precision differential head, a linking part, a corrugated pipe spring, a flange component, piezoelectric ceramics and a plane reflector, wherein the front end of the stepping motor is connected with an adjusting end head of the high-precision differential head through a linking screw rod, the other end of the high-precision differential head is connected with a linking screw rod II, a shell is arranged on the outer side of the high-precision differential head, one end of the shell is fixed on the stepping motor, the corrugated pipe spring and the linking part are positioned in the shell, flanges are respectively arranged at two ends of the corrugated pipe spring, the flange at one end of the corrugated pipe spring is fixedly connected with the other end of the shell, the flange at the other end of the corrugated pipe spring is connected with the linking part in a sealing and welding manner, and the linking screw rod II of the high-precision differential head sequentially penetrates through the linking part, the corrugated pipe spring, the shell and the flange component to, the front end of the piezoelectric ceramic is connected with the plane reflector through an insulating ceramic block, and a plurality of vacuum lead posts are arranged on the flange component.
The axis pitch of the high-precision differential head is 0.1 mm.
The rear end of the stepping motor is connected with a manual adjusting knob.
The flange component comprises a stainless steel vacuum flange, a ceramic flange and a cathode sealing flange, wherein the stainless steel vacuum flange is the same as the ceramic flange in size, the stainless steel vacuum flange is fixedly connected with the end part of the shell, the stainless steel vacuum flange is fixedly connected with the ceramic flange, the ceramic flange is fixedly connected with the cathode sealing flange, 6 vacuum lead posts are arranged on the cathode sealing flange respectively to lead out a power line and a signal line of piezoelectric ceramics.
The piezoelectric ceramic is cylindrical packaging piezoelectric ceramic with a built-in steel shaft.
The outer side surface of the shell is provided with a scale groove.
The engaging part is a cylindrical stainless steel sleeve and is welded on the outer side of the corrugated pipe spring in a sealing mode, so that the interior of the corrugated pipe spring is kept in vacuum.
And 6 vacuum lead posts are arranged on the cathode sealing flange.
The piezoelectric ceramic is a packaging cylindrical piezoelectric ceramic, a bolt is arranged at the front end of the piezoelectric ceramic, a screw hole is formed at the rear end of the piezoelectric ceramic, a steel shaft is arranged in the piezoelectric ceramic, and 2 voltage input lines and 4 feedback signal lines are arranged on the side surface of the piezoelectric ceramic.
And a voltage input line and a feedback signal line led out from the vacuum lead post are connected to the piezoelectric ceramic driver.
The stepping motor is connected to a stepping motor driver through a power line and a signal line.
The differential head, the stepping motor and the piezoelectric ceramics are tightly connected into a horizontal straight line, so that the driving of each part can enable the plane mirror at the front end to move back and forth in the axial direction.
The bellows spring and the sealing flange with the sealing washer enable the whole adjusting mechanism to keep a sealing state, and the vacuum degree requirement of the HCN laser is met.
The piezoelectric ceramic is connected with the plane reflector, so that the extremely high adjusting precision of the piezoelectric ceramic is ensured.
The invention has two-stage drive of the stepping motor and the piezoelectric ceramics, the adjusting precision of the stepping motor can reach 2 mu m, the adjusting precision of the piezoelectric ceramics can reach 10nm, and the rear end of the stepping motor is provided with an adjusting knob which can be manually operated.
The invention drives a high-precision differential head knob in a mechanism to rotate by rotating an adjusting knob at the rear end of a rotating mechanism or controlling a stepping motor at the rear end to rotate, the knob of the high-precision differential head rotates to generate the back and forth movement of an output rod at the front end of the differential head, and further drives a connecting rod and packaging cylindrical piezoelectric ceramics at the front end to move back and forth, so that a plane reflector arranged on the piezoelectric ceramics moves back and forth, and the purpose of adjusting the cavity length of a laser is achieved, wherein the adjusting precision is 2 mu m. The piezoelectric ceramic is connected with an external piezoelectric ceramic controller through a vacuum lead post, and the piezoelectric ceramic can drive the front-end plane reflector to carry out displacement output with higher precision, wherein the precision is 10nm, and the method is used for controlling the intermediate frequency of the laser.
The invention has the advantages that: the mechanism of the invention has small volume and compact structure, can provide output power adjustment with the precision of 2 mu m and intermediate frequency adjustment with the precision of 10nm for the HCN laser, and experimenters can randomly change the output displacement of the stepping motor and the piezoelectric ceramics according to the experimental requirements to obtain the required output power and intermediate frequency signals. Meanwhile, the rear-end means adjusting knob can be convenient for experimenters to find output signals at the initial running stage of the HCN laser and test the performance of the laser, so that the adjusting mechanism can provide high-precision cavity length adjustment for the HCN laser and guarantee the control and the stability of the output power and the intermediate frequency of the HCN laser.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
FIG. 2 is a side view of the system of the present invention with hidden lines removed.
Fig. 3 is a schematic diagram of a structure of a packaged cylindrical piezoelectric ceramic.
Fig. 4 is a control flow chart of the dual laser stability control system.
Fig. 5 is a schematic diagram of the installation of the novel HCN cavity length adjusting mechanism on the HCN two-color laser.
Detailed Description
As shown in fig. 1,2, 3, and 4, a novel HCN laser cavity length adjusting mechanism includes a stepping motor 1, a high-precision differential head 2, and a piezoelectric ceramic 3, wherein the front end of the stepping motor 1 is connected to the high-precision differential head 2 through a connecting screw rod one 4, the rear end of the stepping motor 1 is connected to an adjusting knob 5, the connecting member 6 is hermetically welded to a bellows spring 7, the bellows spring 7 is welded to a stainless steel housing 8, the front end of the stainless steel housing is connected to a stainless steel vacuum flange 9, the stainless steel vacuum flange 9 is connected to a ceramic flange 10 of the same size to ensure insulation, the ceramic flange 10 is connected to a laser cathode sealing flange 11, 6 vacuum lead posts 12 are processed on the laser cathode sealing flange 11 to lead out a power line and a signal line of the piezoelectric ceramic 3, a connecting screw rod two 13 of the high-precision differential head 2 sequentially passes through the connecting member 6, the signal line, and the connecting screw rod two 13 of the high-precision differential head 2 are connected to, The corrugated pipe spring 7, the shell 8, the vacuum flange 9, the ceramic flange 10 and the cathode sealing flange 11 are connected with the rear end of the piezoelectric ceramic, and the front end of the piezoelectric ceramic is connected with the plane reflector 14. The engaging part is a cylindrical stainless steel sleeve and is welded on the outer side of the corrugated pipe spring in a sealing mode, so that the interior of the corrugated pipe spring is kept in vacuum.
Fig. 4 is a control flow chart of the HCN twin laser stability control system applied in the present invention. The whole stability feedback control system is connected by a laser system, an actuating mechanism, a driver and a PLC (programmable logic controller), so that a stable closed-loop system is formed, and the automatic control and remote monitoring of the twin laser are ensured. The industrial computer is as the host computer, it is direct continuous with the PLC as the next computer, carry out the communication with industrial computer and PLC, can directly show the running state of whole laser instrument system on the interface of industrial computer, through the industrial computer, can keep the operation and the stopping of whole double laser instrument system's automatic control, and can input concrete instruction, give actuating mechanism's driver with the instruction transmission through PLC, drive step motor or piezoceramics, the plane mirror that makes the laser instrument negative pole end carries out the back-and-forth movement, and then adjust double-colored laser instrument's power and intermediate frequency. The signals of the two lasers respectively enter the three detectors through an optical system consisting of the reflecting mirror and the concave mirror, the detectors B and C respectively detect the power signals of the two- color lasers 1 and 2, and the light of the two lasers enters the detector C after being split and combined to receive the intermediate frequency signal. The intermediate frequency signal is collected and identified by the digital oscilloscope, is transmitted to the PLC together with the type of the output power, and is received by the industrial personal computer through the PLC and displayed to the working personnel.
As shown in fig. 5, the adjusting mechanism is installed on an HCN two-color laser 15, a cathode sealing flange 11 is tightly connected with the laser through a sealing washer, so as to ensure the vacuum state of the laser, and after the laser emits light, an adjusting knob 5 is manually adjusted, so that a plane mirror at the front end of the adjusting mechanism moves axially back and forth, and the output power value of the laser can be manually changed; the stepping motor and the piezoelectric ceramics are respectively connected to the motor driver and the piezoelectric ceramics driver, so that the automatic control and the remote control of the output power and the intermediate frequency of the HCN laser can be realized, specific step length parameters are output on a computer, the stepping motor and the piezoelectric ceramics can carry out accurate displacement output, the adjustment precision of the stepping motor can reach 2 mu m, and the adjustment precision of the piezoelectric ceramics can reach 10 nm.
Claims (7)
1. A novel HCN laser cavity length adjustment mechanism is characterized in that: the high-precision micro-head adjusting device comprises a stepping motor, a high-precision micro-head, a joining part, a corrugated pipe spring, a flange component, piezoelectric ceramics and a plane mirror, wherein the front end of the stepping motor is connected with an adjusting end of the high-precision micro-head through a joining screw rod, the other end of the high-precision micro-head is connected with a joining screw rod II, a shell is arranged on the outer side of the high-precision micro-head, one end of the shell is fixed on the stepping motor, the corrugated pipe spring and the joining part are positioned in the shell, flanges are respectively arranged at two ends of the corrugated pipe spring, the flange at one end of the corrugated pipe spring is fixedly connected with the other end of the shell, the flange at the other end of the corrugated pipe spring is hermetically welded and connected with the joining part, the joining screw rod II of the high-precision micro-head sequentially penetrates through the joining part, the corrugated pipe spring, the shell, the flange component and the back end, and a plurality of vacuum lead posts are arranged on the flange assembly.
2. A novel HCN laser cavity length adjustment mechanism as defined in claim 1 wherein: the axis pitch of the high-precision differential head is 0.1 mm.
3. A novel HCN laser cavity length adjustment mechanism as defined in claim 1 wherein: the rear end of the stepping motor is connected with a manual adjusting knob.
4. A novel HCN laser cavity length adjustment mechanism as defined in claim 1 wherein: the flange component comprises a stainless steel vacuum flange, a ceramic flange and a cathode sealing flange, wherein the stainless steel vacuum flange is the same as the ceramic flange in size, the stainless steel vacuum flange is fixedly connected with the end part of the shell, the stainless steel vacuum flange is fixedly connected with the ceramic flange, the ceramic flange is fixedly connected with the cathode sealing flange, 6 vacuum lead posts are arranged on the cathode sealing flange respectively to lead out a power line and a signal line of piezoelectric ceramics.
5. A novel HCN laser cavity length adjustment mechanism as defined in claim 1 wherein: the piezoelectric ceramic is cylindrical packaging piezoelectric ceramic with a built-in steel shaft.
6. A novel HCN laser cavity length adjustment mechanism as defined in claim 1 wherein: the outer side surface of the shell is provided with a scale groove.
7. A novel HCN laser cavity length adjustment mechanism as defined in claim 1 wherein: the connecting part is a cylindrical stainless steel sleeve and is welded at one end of the bellows spring in a sealing mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910809244.7A CN110676681A (en) | 2019-08-29 | 2019-08-29 | Novel HCN laser cavity length adjustment mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910809244.7A CN110676681A (en) | 2019-08-29 | 2019-08-29 | Novel HCN laser cavity length adjustment mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097848A (en) * | 2021-03-26 | 2021-07-09 | 中国科学院合肥物质科学研究院 | Continuous air inlet type carbon dioxide pumping formic acid laser |
Citations (4)
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|---|---|---|---|---|
| CN85202356U (en) * | 1985-06-21 | 1986-04-02 | 北京工业学院 | Traverse steady-freguency zeeman laser |
| EP0283450A2 (en) * | 1987-03-20 | 1988-09-21 | Ente per le nuove tecnologie, l'energia e l'ambiente ( ENEA) | A FIR (far infrared radiation) laser cavity optically pumped and having a carrying tube |
| CN106508083B (en) * | 2007-05-14 | 2011-09-07 | 核工业西南物理研究院 | Chamber collimation precession mechanism adjusted by long resonator HCN waveguide lasers |
| CN105261925A (en) * | 2015-08-24 | 2016-01-20 | 中国科学院等离子体物理研究所 | Automatic control system for power of HCN laser interferometer |
-
2019
- 2019-08-29 CN CN201910809244.7A patent/CN110676681A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85202356U (en) * | 1985-06-21 | 1986-04-02 | 北京工业学院 | Traverse steady-freguency zeeman laser |
| EP0283450A2 (en) * | 1987-03-20 | 1988-09-21 | Ente per le nuove tecnologie, l'energia e l'ambiente ( ENEA) | A FIR (far infrared radiation) laser cavity optically pumped and having a carrying tube |
| CN106508083B (en) * | 2007-05-14 | 2011-09-07 | 核工业西南物理研究院 | Chamber collimation precession mechanism adjusted by long resonator HCN waveguide lasers |
| CN105261925A (en) * | 2015-08-24 | 2016-01-20 | 中国科学院等离子体物理研究所 | Automatic control system for power of HCN laser interferometer |
Non-Patent Citations (1)
| Title |
|---|
| 解家兴: ""紧凑型HCN双色激光器的研制及其稳定性控制研究"", 《中国优秀硕士论文全文数据库（电子期刊）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097848A (en) * | 2021-03-26 | 2021-07-09 | 中国科学院合肥物质科学研究院 | Continuous air inlet type carbon dioxide pumping formic acid laser |
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