CN111244746A - Laser system - Google Patents
Laser system Download PDFInfo
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- CN111244746A CN111244746A CN202010039051.0A CN202010039051A CN111244746A CN 111244746 A CN111244746 A CN 111244746A CN 202010039051 A CN202010039051 A CN 202010039051A CN 111244746 A CN111244746 A CN 111244746A
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- 239000013078 crystal Substances 0.000 claims abstract description 57
- 238000012544 monitoring process Methods 0.000 claims abstract description 50
- 239000000919 ceramic Substances 0.000 claims abstract description 44
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052594 sapphire Inorganic materials 0.000 claims description 6
- 239000010980 sapphire Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims description 4
- QWVYNEUUYROOSZ-UHFFFAOYSA-N trioxido(oxo)vanadium;yttrium(3+) Chemical compound [Y+3].[O-][V]([O-])([O-])=O QWVYNEUUYROOSZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001506 fluorescence spectroscopy Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000010360 secondary oscillation Effects 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
Abstract
The invention discloses a laser system, belongs to the technical field of lasers, and can solve the problem that the wavelength of output laser drifts along with time in the use process of the existing crystal laser. The laser system comprises a monitoring module, a laser and piezoelectric ceramics; the monitoring module is used for monitoring the laser wavelength output by the laser and feeding back the monitoring result to the piezoelectric ceramic; the piezoelectric ceramic is connected with the laser and used for adjusting the cavity length of the laser according to a monitoring result fed back by the monitoring module, so that the wavelength output by the laser is stable. The laser system provided by the invention has the advantages of simple structure, long-term stability of the wavelength of laser output by the laser, and low production and use cost.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a laser system.
Background
A laser is a device capable of emitting laser light. A single longitudinal mode laser refers to a laser that outputs a laser mode that is both a single longitudinal mode and a single transverse mode. The single longitudinal mode refers to that only a single frequency oscillates in the resonant cavity, and the single transverse mode refers to that the light intensity is distributed in a Gaussian distribution on the light cross section. The single longitudinal mode laser can output laser with single frequency and narrow line width, so the single longitudinal mode laser has wide application in the fields of high-resolution spectroscopy, atmospheric optics, laser remote sensing, laser molecular fluorescence spectroscopy and the like.
In the field of laser molecular fluorescence spectroscopy, the molecular absorption line is narrow, so that the laser needs to be a tunable narrow-line-width laser, and the wavelength of the laser is in the wavelength range of the molecular absorption line. In the prior art, a crystal laser is often used as a tunable laser, and a diffraction grating with a grazing incidence structure is inserted into a resonant cavity of the crystal laser, so that laser output of a narrow-linewidth single longitudinal mode can be obtained. However, when the crystal laser works, the thermal effect of the laser crystal in the crystal laser causes the wavelength of the output laser to shift with time, and when the wavelength shifts out of the range of the molecular absorption spectrum line, the crystal laser cannot be used.
Disclosure of Invention
The invention aims to provide a laser system to solve the problem that the wavelength of output laser drifts along with time in the use process of the existing crystal laser.
In order to achieve the purpose, the invention provides the following technical scheme:
a laser system comprises a monitoring module, a laser and piezoelectric ceramics;
the monitoring module is used for monitoring the laser wavelength output by the laser and feeding back the monitoring result to the piezoelectric ceramic;
the piezoelectric ceramic is connected with the laser and used for adjusting the cavity length of the laser according to a monitoring result fed back by the monitoring module, so that the wavelength output by the laser is stable.
As a still further scheme of the invention: the monitoring module comprises a wavelength meter and a feedback circuit;
the wavelength meter is arranged on a light path of the laser output by the laser and is used for monitoring the wavelength of the laser output by the laser;
and the feedback circuit is used for comparing the monitored wavelength with the initial wavelength to generate a feedback signal and transmitting the feedback signal to the piezoelectric ceramic.
As a still further scheme of the invention: the wavelength meter is also used for converting the monitored wavelength into a corresponding voltage signal and transmitting the voltage signal to the feedback circuit;
correspondingly, the feedback circuit generates a feedback voltage signal according to the received voltage signal and transmits the feedback voltage signal to the piezoelectric ceramic.
As a still further scheme of the invention: the feedback circuit comprises an analog-to-digital converter, a singlechip and a digital-to-analog converter;
the analog-to-digital converter is used for converting the voltage signal transmitted by the wavelength meter into a digital signal;
the single chip microcomputer is used for comparing the digital signal with the initial digital signal to obtain a feedback digital signal;
and the digital-to-analog converter is used for converting the feedback digital signal into a feedback voltage signal and transmitting the feedback voltage signal to the piezoelectric ceramic.
As a still further scheme of the invention: the feedback circuit further comprises a proportional amplifier, and the proportional amplifier is used for amplifying the feedback voltage signal transmitted by the digital-to-analog converter and transmitting the amplified feedback voltage signal to the piezoelectric ceramic.
As a still further scheme of the invention: the laser comprises a laser crystal and a resonant cavity;
the laser crystal is used for generating laser after being irradiated by a light source;
and the resonant cavity is arranged on the outer side of the laser crystal and is used for tuning the wavelength of the laser.
As a still further scheme of the invention: the resonant cavity comprises a back cavity mirror and an output mirror;
the rear cavity mirror is arranged on one side of the laser crystal, and the output mirror is arranged on the other side far away from the laser crystal;
the piezoelectric ceramic is arranged on the side wall of the other side of the rear cavity mirror, which is far away from the laser crystal;
the wavelength meter is arranged on a light path of the laser output by the output mirror.
As a still further scheme of the invention: the resonant cavity further comprises a diffraction grating and a reflector;
the diffraction grating is arranged between the laser crystal and the output mirror and is used for dividing the laser into first-order diffraction light and zero-order diffraction light after diffraction;
the reflector is arranged on an emergent light path of the first-order diffracted light and used for reflecting the first-order diffracted light to the laser crystal.
As a still further scheme of the invention: the system further comprises a spectroscope which is arranged between the laser and the monitoring module, the spectroscope divides laser output by the laser into reflected light and transmitted light, and the monitoring module monitors the wavelength of the reflected light.
As a still further scheme of the invention: the laser crystal is selected from any one of titanium sapphire crystal, neodymium-doped yttrium aluminum garnet and neodymium-doped yttrium vanadate crystal.
The beneficial effects of the invention include but are not limited to:
(1) the invention provides a laser system, which comprises a monitoring module, a laser and piezoelectric ceramics; the monitoring module is used for monitoring the laser wavelength output by the laser and feeding back the monitoring result to the piezoelectric ceramic; the piezoelectric ceramic is connected with the laser and used for adjusting the cavity length of the laser according to a monitoring result fed back by the monitoring module, so that the wavelength output by the laser is stable. The laser system provided by the invention has the advantages of simple structure, long-term stability of the wavelength of laser output by the laser, and low production and use cost.
(2) Furthermore, the wavelength meter and the feedback circuit are arranged, and the wavelength meter monitors the wavelength of the laser output by the laser; the feedback circuit compares the monitored wavelength with the initial wavelength to generate a feedback voltage signal, transmits the feedback voltage signal to the piezoelectric ceramic, and finally receives the feedback voltage signal through the piezoelectric ceramic to change the cavity length of the laser, so that the wavelength changes along with the change of the cavity length of the laser. Furthermore, the feedback circuit comprises an analog-digital converter, a single chip microcomputer and a digital-analog converter, so that the voltage signal transmitted by the wavelength meter is converted into a feedback voltage signal and then transmitted to the piezoelectric ceramic.
Drawings
FIG. 1 is a schematic diagram of a laser system according to the present invention;
FIG. 2 is a schematic diagram of a feedback circuit in a laser system according to the present invention;
in the figure: 1-piezoelectric ceramics; 2-a rear cavity mirror; 3-laser crystal; 4-a diffraction grating; 5-an output mirror; 6-a reflector; a 7-spectroscope; 8-a wavelength meter; 9-feedback circuit.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
Fig. 1 is a schematic structural diagram of a laser system provided in the present application, as shown in fig. 1, including a monitoring module, a laser, and a piezoelectric ceramic;
the monitoring module is used for monitoring the laser wavelength output by the laser and feeding back the monitoring result to the piezoelectric ceramic;
the piezoelectric ceramic is connected with the laser and used for adjusting the cavity length of the laser according to a monitoring result fed back by the monitoring module, so that the wavelength output by the laser is stable.
Further, the monitoring module comprises a wavelength meter and a feedback circuit;
the wavelength meter is arranged on a light path of the laser output by the laser and is used for monitoring the wavelength of the laser output by the laser;
and the feedback circuit is used for comparing the monitored wavelength with the initial wavelength to generate a feedback signal and transmitting the feedback signal to the piezoelectric ceramic.
Furthermore, the wavelength meter is also used for converting the monitored wavelength into a corresponding voltage signal and transmitting the voltage signal to the feedback circuit;
accordingly, the feedback circuit generates a feedback voltage signal according to the received voltage signal and transmits the feedback voltage signal to the piezoelectric ceramic.
Further, the feedback circuit includes an analog-to-digital converter, a single chip, and a digital-to-analog converter, as shown in fig. 2;
the analog-to-digital converter is used for converting the voltage signal transmitted by the wavelength meter into a digital signal;
the singlechip is used for comparing the digital signal with the initial digital signal to obtain a feedback digital signal;
when the digital signal received in real time is smaller than the initial digital signal, increasing the digital signal to be the same as the initial digital signal at the maximum; when the digital signal received in real time is larger than the initial digital signal, reducing the digital signal to be the same as the initial digital signal at the minimum; the increasing or decreasing digital signal is adjusted according to specific experiments.
The initial wavelength is wavelength data monitored by a wavelength meter when the system starts to work; the initial digital signal corresponds to an initial wavelength.
Furthermore, because the 51 SCM is the simplest and cheapest one, the preferred SCM in the invention is the 51 SCM.
And the digital-to-analog converter is used for converting the feedback digital signal into a feedback voltage signal and transmitting the feedback voltage signal to the piezoelectric ceramic.
Specifically, a feedback circuit applies a tiny positive voltage on the piezoelectric ceramic, a wavelength meter simultaneously monitors the wavelength of output laser, the wavelength values are compared, the initial wavelength value is subtracted from the wavelength monitored in real time, and if the difference value is positive, a negative reverse voltage is applied to the piezoelectric ceramic; and continuously monitoring the laser wavelength, continuously applying a negative reverse voltage to the piezoelectric ceramic if the difference is positive, keeping the voltage of the piezoelectric ceramic unchanged if the difference is zero, and applying a positive voltage to the piezoelectric ceramic if the difference is negative.
Further, the feedback circuit further comprises a proportional amplifier, and the proportional amplifier is used for amplifying the feedback voltage signal transmitted by the digital-to-analog converter and transmitting the amplified feedback voltage signal to the piezoelectric ceramic.
Further, the laser comprises a laser crystal and a resonant cavity;
the laser crystal is used for generating laser after being irradiated by a light source;
and the resonant cavity is arranged on the outer side of the laser crystal and is used for tuning the wavelength of the laser.
Further, the laser crystal is any crystal that can generate laser light, and the invention is not limited thereto. Preferably, the laser crystal in the present invention is selected from any one of a titanium sapphire crystal, a neodymium-doped yttrium aluminum garnet crystal, and a neodymium-doped yttrium vanadate crystal.
The laser crystal is further preferable to be a titanium sapphire crystal because the titanium sapphire crystal has tunable bandwidth, can output tunable laser with the bandwidth of 660 nm-1100 nm and has excellent thermal, optical, physical, chemical and mechanical properties.
Further, the laser crystal is selected from any one of titanium sapphire crystal, neodymium-doped yttrium aluminum garnet crystal and neodymium-doped yttrium vanadate crystal.
Further, the resonant cavity comprises a back cavity mirror and an output mirror;
the rear cavity mirror is arranged on one side of the laser crystal, and the output mirror is arranged on the other side far away from the laser crystal; the laser emitted by the laser crystal forms laser with certain frequency and consistent direction in the resonant cavity.
The piezoelectric ceramic is arranged on the side wall of the back cavity mirror, which is far away from the other side of the laser crystal, receives the feedback voltage signal, drives the back cavity mirror, and changes the cavity length of the resonant cavity, thereby achieving the purpose of tuning the laser wavelength;
the wavelength meter is arranged on the light path of the laser output by the output mirror.
Furthermore, the resonant cavity also comprises a diffraction grating and a reflecting mirror;
the diffraction grating is arranged between the laser crystal and the output mirror and is used for dividing the laser into first-order diffraction light and zero-order diffraction light after diffraction;
the reflector is arranged on the emergent light path of the first-order diffraction light and is used for reflecting the first-order diffraction light to the laser crystal.
In the invention, laser emitted by the laser crystal glancing and entering the diffraction grating at an incidence angle close to 90 degrees, the laser is divided into first-order diffraction light and zero-order diffraction light after being diffracted by the diffraction grating, the first-order diffraction light is reflected back to the laser crystal through the reflector to form main oscillation to generate laser with narrow line width, the zero-order diffraction light is partially reflected by the output mirror to be used as secondary oscillation for improving the energy of the output laser, and one part of the zero-order diffraction light is used for outputting the laser.
Furthermore, the system also comprises a spectroscope which is arranged between the laser and the monitoring module, wherein the spectroscope divides the laser output by the laser into reflected light and transmitted light, the monitoring module monitors the wavelength of the reflected light, and the transmitted light is used for outputting the laser of the laser.
The invention provides a laser system, which comprises a monitoring module, a laser and piezoelectric ceramics; the monitoring module is used for monitoring the laser wavelength output by the laser and feeding back the monitoring result to the piezoelectric ceramic; the piezoelectric ceramic is connected with the laser and used for adjusting the cavity length of the laser according to a monitoring result fed back by the monitoring module, so that the wavelength output by the laser is stable. The laser system provided by the invention has the advantages of simple structure, long-term stability of the wavelength of laser output by the laser, and low production and use cost.
When the laser system provided by the invention is used, a light source irradiates a laser crystal to generate laser, the emitted laser glazes and enters a diffraction grating at an incidence angle close to 90 degrees, the laser is divided into first-order diffraction light and zero-order diffraction light after being diffracted by the diffraction grating, the first-order diffraction light is reflected back to the laser crystal through a reflector to form main oscillation, the laser with narrow line width is generated, the zero-order diffraction light is partially reflected through an output mirror to be used as secondary oscillation to improve output energy, and one part of the zero-order diffraction light is output as the laser. The output laser is divided into reflected light and transmitted light after passing through the beam splitter, the reflected light is monitored by the wavelength meter in real time for wavelength, the wavelength signal is transmitted to the feedback circuit after the wavelength of the output laser is obtained by the measurement of the wavelength meter, the feedback circuit generates a feedback voltage signal according to the wavelength signal and transmits the feedback voltage signal to the piezoelectric ceramic, the piezoelectric ceramic drives the rear cavity mirror according to the feedback voltage signal to change the cavity length of the resonant cavity, the wavelength of the output laser is changed according to the proportion of the cavity length change, and the laser wavelength generated by the laser returns to the initial wavelength, so that the laser wavelength is kept stable.
The above description is only an example of the present invention, and not intended to limit the present invention in any way, and although the present invention has been disclosed in the preferred embodiments, the present invention is not limited thereto, and those skilled in the art can make various changes and modifications within the technical scope of the present invention without departing from the technical scope of the present invention.
Claims (10)
1. A laser system is characterized by comprising a monitoring module, a laser and piezoelectric ceramics;
the monitoring module is used for monitoring the laser wavelength output by the laser and feeding back the monitoring result to the piezoelectric ceramic;
the piezoelectric ceramic is connected with the laser and used for adjusting the cavity length of the laser according to a monitoring result fed back by the monitoring module, so that the wavelength output by the laser is stable.
2. The laser system of claim 1, wherein the monitoring module comprises a wavelength meter and a feedback circuit;
the wavelength meter is arranged on a light path of the laser output by the laser and is used for monitoring the wavelength of the laser output by the laser;
and the feedback circuit is used for comparing the monitored wavelength with the initial wavelength to generate a feedback signal and transmitting the feedback signal to the piezoelectric ceramic.
3. The laser system of claim 2, wherein the wavelength meter is further configured to convert the monitored wavelength to a corresponding voltage signal and transmit the voltage signal to the feedback circuit;
correspondingly, the feedback circuit generates a feedback voltage signal according to the received voltage signal and transmits the feedback voltage signal to the piezoelectric ceramic.
4. The laser system of claim 3, wherein the feedback circuit comprises an analog-to-digital converter, a single-chip microcomputer, and a digital-to-analog converter;
the analog-to-digital converter is used for converting the voltage signal transmitted by the wavelength meter into a digital signal;
the single chip microcomputer is used for comparing the digital signal with the initial digital signal to obtain a feedback digital signal;
and the digital-to-analog converter is used for converting the feedback digital signal into a feedback voltage signal and transmitting the feedback voltage signal to the piezoelectric ceramic.
5. The laser system of claim 4, wherein the feedback circuit further comprises a proportional amplifier for amplifying the feedback voltage signal transmitted by the digital-to-analog converter and transmitting the amplified feedback voltage signal to the piezoelectric ceramic.
6. The laser system of claim 1, wherein the laser comprises a laser crystal and a resonant cavity;
the laser crystal is used for generating laser after being irradiated by a light source;
and the resonant cavity is arranged on the outer side of the laser crystal and is used for tuning the wavelength of the laser.
7. The laser system of claim 6, wherein the resonant cavity comprises a back cavity mirror and an output mirror;
the rear cavity mirror is arranged on one side of the laser crystal, and the output mirror is arranged on the other side far away from the laser crystal;
the piezoelectric ceramic is arranged on the side wall of the other side of the rear cavity mirror, which is far away from the laser crystal;
the wavelength meter is arranged on a light path of the laser output by the output mirror.
8. The laser system of claim 7, wherein the resonant cavity further comprises a diffraction grating and a mirror;
the diffraction grating is arranged between the laser crystal and the output mirror and is used for dividing the laser into first-order diffraction light and zero-order diffraction light after diffraction;
the reflector is arranged on an emergent light path of the first-order diffracted light and used for reflecting the first-order diffracted light to the laser crystal.
9. The laser system of claim 1, further comprising a beam splitter disposed between the laser and the monitoring module, the beam splitter splitting laser light output by the laser into reflected light and transmitted light, the monitoring module monitoring a wavelength of the reflected light.
10. The laser system of claim 6, wherein the laser crystal is selected from any one of a crystal of titanium sapphire, neodymium-doped yttrium aluminum garnet, and neodymium-doped yttrium vanadate crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010039051.0A CN111244746A (en) | 2020-01-14 | 2020-01-14 | Laser system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010039051.0A CN111244746A (en) | 2020-01-14 | 2020-01-14 | Laser system |
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|---|---|
| CN111244746A true CN111244746A (en) | 2020-06-05 |
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| CN202010039051.0A Pending CN111244746A (en) | 2020-01-14 | 2020-01-14 | Laser system |
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| CN1776974A (en) * | 2005-11-29 | 2006-05-24 | 胡姝玲 | Short-pulse ytterbium-doped double-cladded-layer optical fiber laser |
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| CN104283101A (en) * | 2014-11-12 | 2015-01-14 | 核工业理化工程研究院 | All-solid-state single-frequency tunable red laser |
| CN104466635A (en) * | 2014-11-30 | 2015-03-25 | 华南理工大学 | Single frequency fiber laser with high frequency stability |
| CN107134711A (en) * | 2017-06-26 | 2017-09-05 | 吉林大学 | Optical pulse generator based on piezoelectric ceramics feedback control |
| CN107240854A (en) * | 2017-07-07 | 2017-10-10 | 浙江理工大学 | Laser frequency lock based on lack sampling is to frequency comb method and device |
| CN107579413A (en) * | 2017-09-21 | 2018-01-12 | 山西大学 | A kind of method for extending all-solid-state continuous wave single-frequency laser tuning range |
| CN109521560A (en) * | 2018-12-29 | 2019-03-26 | 中国科学院半导体研究所 | Adaptive optical filtering system |
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2020
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| CN2109002U (en) * | 1991-10-15 | 1992-07-01 | 国家光学机械质量监督检验测试中心 | Laser frequency stabilisation device |
| CN1776974A (en) * | 2005-11-29 | 2006-05-24 | 胡姝玲 | Short-pulse ytterbium-doped double-cladded-layer optical fiber laser |
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