CN101022203A - Double-electro-optic modulation QNdi:YAG laser - Google Patents
Double-electro-optic modulation QNdi:YAG laser Download PDFInfo
- Publication number
- CN101022203A CN101022203A CN 200710038022 CN200710038022A CN101022203A CN 101022203 A CN101022203 A CN 101022203A CN 200710038022 CN200710038022 CN 200710038022 CN 200710038022 A CN200710038022 A CN 200710038022A CN 101022203 A CN101022203 A CN 101022203A
- Authority
- CN
- China
- Prior art keywords
- switched
- crystal
- mirror
- laser
- polarizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Lasers (AREA)
Abstract
A dual-photoelectric Q-switched Nd:YAG laser includes a main optical path on a main oscillation axes composed of an output coupling mirror, a Nd:YAG bar, a polariser, a first 1/4 wave plate, a first Q-switched crystal and a first back control mirror arranged orderly, in which, said polarizer is in Brewster angle with the opposite direction of emitted laser, which is charactered that a Q-switched branch is along the direction of depolarization lost of the polarizer and is composed of a second 1/4 wave plate, a second Q-switched crystal and a second back cavity mirror. This invention adds a Q-switched branch along the depolarization lost output optical path on the basis of the traditional Q-switched polarization cavity, so that, lost component is fed back to the cavity along the original path via the Q-switched switch to form effective laser output.
Description
Technical field
The present invention relates to laser, particularly a kind of two electric-optically Q-switched Nd:YAG lasers.
Background technology
The solid-state laser of high-average power, high repetition frequency, high light beam quality has important use to be worth in fields such as industrial processes, military equipment, space communication and medical diagnosis and treatment.Along with improving constantly of high power semiconductor laser diode array output performance, the characteristics that all solid state laser of semiconductor laser pumping (DPSSL) is little with its volume, efficient is high, the life-span is long become the focus of laser development rapidly.
In the high power all solid state laser, the pumping spectrum of semiconductor laser diode and the absorption spectrum of solid state gain medium can be realized coupling, but because the pumping light power density in the medium significantly strengthens, serious thermal effect can appear, cause phenomenons such as thermally induced birefringence, phase distortion, hot focus, thermal lens, have a strong impact on the power output and the beam quality of laser.Along with the increase of pump power, the thermal effect of laser medium can be more and more significant, even become the lethal factor that laser performance improves.Wherein the thermally induced birefringence of gain media makes the polarizability of laser beam obviously degenerate, and when having the polarizer in the chamber, cavity loss significantly increases, and will directly cause the decline of laser output power, becomes the key factor that the restriction laser output power promotes.And the serious thermal lensing effect of gain media will cause the dwindling of oscillation mode volume in the gain active region, and active population is counted effective rate of utilization and descended, the raising of final limit laser device efficient.
Summary of the invention
For thermally induced birefringence and the thermal lensing effect that compensates solid state gain medium simultaneously, further improve the power output of the electric-optically Q-switched Nd:YAG laser of semiconductor laser diode (LD) side direction pumping, the present invention is by a kind of two electric-optically Q-switched Nd:YAG lasers, this laser should have compact conformation, the characteristics that laser output power is high.
Principle of the present invention is to transfer Q resonance branch road along additional one of the depolarization loss output light path of polarizer on tradition is transferred the basis of Q resonant cavity, make the loss component through Q opens the light after by in the backspace chamber, former road, form efficient laser and export.
Technical solution of the present invention is:
A kind of two electric-optically Q-switched Nd:YAG laser, comprise main optical path, this main optical path is on the main oscillations axis, constitute by output coupling mirror, Nd:YAG rod, polarizer, first quarter wave plate, first adjusting Q crystal, first Effect of Back-Cavity Mirror of placing successively, wherein said polarizer becomes Brewster's angle with the opposite direction of shoot laser, be characterized in also having one to transfer the Q branch road, this accent Q branch road is in the depolarization loss output light path direction along described polarizer, is made of second quarter wave plate, second adjusting Q crystal and second Effect of Back-Cavity Mirror of placing successively.
Described output coupling mirror is dull and stereotyped coupling mirror, and described Effect of Back-Cavity Mirror is the convex surface completely reflecting mirror.
Described adjusting Q crystal is potassium dideuterium phosphate crystal (being designated hereinafter simply as KD*P).
Described two electric-optically Q-switched Nd:YAG laser is transferred at main road on the basis of Q resonant cavity and is transferred Q resonance branch road along additional one of the depolarization loss output light path of polarizer, make the loss component behind Q switching by in the backspace chamber, former road, form effective laser output.This structure can compensate the thermally induced birefringence and the thermal lensing effect of solid state gain medium simultaneously, improves the power output of laser.
The course of work of the present invention is: the electric-optically Q-switched crystal of the KD*P in the two-way is added the voltage with step Q.Because the thermal birefringence effect of laser medium, laser beam is partial polarization or non-polarized light after gain media Nd:YAG rod comes out, after it is through the Brewster polarizer, be broken down into s polarised light and p polarised light, be polarized sheet respectively and reflex in the branch road, or in main road, vibrate through polarizer.When the KD*P crystal in the two-way did not add 1/4 wave voltage, two-way all can not form vibration, can't export laser.When two KD*P crystal were added 1/4 ripple synchronizing voltage, the oscillation light in the two-way produced 180 ° phase delay, and the polarization direction does not change, and then the light in the two-way vibrates between two Effect of Back-Cavity Mirror and outgoing mirror separately respectively, obtained laser output by outgoing mirror.
The present invention has the following advantages:
1, adopts two adjusting Q crystal resonator design.Transfer in tradition on the basis of Q resonant cavity, add depolarization loss compensation branch road, make hot depolarization loss be compensated.
2, the electric-optically Q-switched crystal of the KD*P in the two-way is added the voltage with step Q.Two branch road resonator parameters are in full accord, and allow the independent simultaneously vibration of s polarized component and p polarized component, and vibrate s component and p component polarised light all can form effectively output at every turn.
3, experiment shows, keeps under the situation of system configuration compactness, and power output is improved significantly.
The present invention is described further below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is the general illustration of laser resonant cavity of the present invention.
Fig. 2 is the electric-optically Q-switched Nd:YAG laser structure schematic diagram that does not have thermal depolarization compensation.
Embodiment
See also Fig. 1, Fig. 1 is the general illustration of laser resonant cavity of the present invention.As seen from Figure 1, the two electric-optically Q-switched Nd:YAG lasers of the present invention, comprise main optical path, this main optical path is on the main oscillations axis, by the output coupling mirror of placing successively 1, Nd:YAG rod 2, polarizer 3, first quarter wave plate 4, first adjusting Q crystal 5, first Effect of Back-Cavity Mirror 6 constitutes, wherein said polarizer 3 becomes Brewster's angle with the opposite direction of shoot laser, be characterized in also having one to transfer the Q branch road, this accent Q branch road is in the depolarization loss output light path direction along described polarizer 3, by second quarter wave plate of placing successively 7, second adjusting Q crystal 8 and second Effect of Back-Cavity Mirror 9 constitute.
Described output coupling mirror 1 is dull and stereotyped coupling mirror, and described Effect of Back-Cavity Mirror 6,9 is the convex surface completely reflecting mirror.
Described adjusting Q crystal 5,8 is the potassium dideuterium phosphate crystal.
To the KD in the two-way
*The electric-optically Q-switched crystal of P adds the voltage with step Q.Because the thermal birefringence effect of laser medium Nd:YAG rod, laser beam is partial polarization or non-polarized light after Nd:YAG rod 2 comes out, when its through being broken down into s and p polarisation behind polarizer 3, be polarized sheet 3 respectively and reflex in the branch road or see through polarizer 3 and in main road, vibrate.KD in two-way
*When the P crystal did not add 1/4 wave voltage, two-way all can not form vibration, can't export laser.When to two KD
*When the P crystal added 1/4 ripple synchronizing voltage, the oscillation light in the two-way produced 180 ° phase delay, and the polarization direction does not change, and then the light in the two-way vibrates between two Effect of Back-Cavity Mirror and outgoing mirror separately respectively, obtained laser output by outgoing mirror 1.This structure can compensate the thermally induced birefringence and the thermal lensing effect of solid state gain medium simultaneously, improves the power output of laser.
The parameter of a specific embodiment of the embodiment of the invention is as follows:
Laser medium Nd:YAG crystalline size is φ 5 * 70mm, and the Nd:YAG crystal 2 is by 32 semiconductor laser diode linear array side surrounding pump-couplings.Semiconductor laser diode linear array threshold current as pumping source is about 12A, and single array maximum peak power is 100W (during electric current 120A), and its duty ratio is 20% under the 1kHz repetition rate.Utilize KD
*The P crystal is as electric-optically Q-switched crystal, and the repetition rate of Q switching also is 1kHz.Laser resonant cavity is long to be 350mm, in order to compensate the thermal lensing effect of the Nd:YAG crystal bar under the high power pumping, adopt the plano-convex chamber to be provided with, output coupling mirror 1 is a slab construction, its transmitance is 70%, total reflection Effect of Back-Cavity Mirror 6,9 adopts convex lens, and the radius of curvature of this protruding total reflection Effect of Back-Cavity Mirror is elected as-250mm.
Experiment shows: when the pumping pulse energy was 307mJ to the maximum, the resonant cavity of thermal depolarization compensation (structure such as Fig. 2) output pulse energy was not 15mJ, and the thermal depolarization compensation laser of unpolarized output is output as 26.2mJ, and output has improved 74.7%.When the energy of maximum pump Pu, the resonant cavity light light conversion efficiency of thermal depolarization compensation is not 4.9%, is 8.5% behind the employing compensated cavity.
In sum, the present invention can effectively compensate the thermally induced birefringence and the thermal lensing effect of solid state gain medium, improves the power output of electric-optically Q-switched Nd:YAG laser.It is long that this laser has compact conformation, efficient height, life-span, and characteristics such as working stability have important use to be worth in fields such as industrial processes, military equipment, space communications.
Claims (3)
1, a kind of two electric-optically Q-switched Nd:YAG laser, comprise main optical path, this main optical path is on the main oscillations axis, by the output coupling mirror of placing successively (1), Nd:YAG rod (2), polarizer (3), first quarter wave plate (4), first adjusting Q crystal (5), first Effect of Back-Cavity Mirror (6) constitutes, wherein said polarizer (3) becomes Brewster's angle with the opposite direction of shoot laser, it is characterized in that also having one to transfer the Q branch road, this accent Q branch road is in the depolarization loss output light path direction along described polarizer (3), by second quarter wave plate of placing successively (7), second adjusting Q crystal (8) and second Effect of Back-Cavity Mirror (9) constitute.
2, two electric-optically Q-switched Nd:YAG laser according to claim 1 is characterized in that described output coupling mirror (1) is dull and stereotyped coupling mirror, and described Effect of Back-Cavity Mirror (6,9) is the convex surface completely reflecting mirror.
3, two electric-optically Q-switched Nd:YAG laser according to claim 1 is characterized in that described adjusting Q crystal (5,8) is the potassium dideuterium phosphate crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710038022 CN101022203A (en) | 2007-03-13 | 2007-03-13 | Double-electro-optic modulation QNdi:YAG laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710038022 CN101022203A (en) | 2007-03-13 | 2007-03-13 | Double-electro-optic modulation QNdi:YAG laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101022203A true CN101022203A (en) | 2007-08-22 |
Family
ID=38709887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710038022 Pending CN101022203A (en) | 2007-03-13 | 2007-03-13 | Double-electro-optic modulation QNdi:YAG laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101022203A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545016A (en) * | 2011-03-09 | 2012-07-04 | 北京国科世纪激光技术有限公司 | Laser dual-Q-switching method and device |
| CN102525650A (en) * | 2010-12-09 | 2012-07-04 | 苏州生物医学工程技术研究所 | Holmium laser lithotrity system |
| CN102670278A (en) * | 2011-03-11 | 2012-09-19 | 苏州生物医学工程技术研究所 | Holmium laser ultrasonic comprehensive lithotripsy treatment system |
| CN104242044A (en) * | 2014-09-29 | 2014-12-24 | 西安理工大学 | Electro-optical double-refraction double-cavity double-frequency Nd:YAG laser device and frequency difference tuning method |
| CN105161961A (en) * | 2015-09-30 | 2015-12-16 | 中国科学院合肥物质科学研究院 | Micro-pulse laser radar light source with high pulse energy |
| CN105281193A (en) * | 2015-11-19 | 2016-01-27 | 中国科学院合肥物质科学研究院 | A laser structure capable of effectively compensating for a thermal depolarization effect and outputting 2.79-micron laser |
| CN105322423A (en) * | 2015-11-15 | 2016-02-10 | 西南技术物理研究所 | Dual-total reflective mirror composite resonant cavity of Nd:YAG electro-optic Q-switched laser |
| CN105723577A (en) * | 2013-10-31 | 2016-06-29 | 富士胶片株式会社 | Laser device and photoacoustic measurement device |
| CN105762637A (en) * | 2016-04-18 | 2016-07-13 | 长春理工大学 | Q-switching laser for improving Q-switching performance |
| CN108306167A (en) * | 2018-01-22 | 2018-07-20 | 武汉安扬激光技术有限责任公司 | A kind of multichannel mode-locked all fibre resonant cavity |
| CN108346971A (en) * | 2018-04-08 | 2018-07-31 | 北京华宇德信光电技术有限公司 | A kind of acousto-optic Q modulation frequency double laser using electrooptical switching control laser output |
| CN110635349A (en) * | 2019-09-27 | 2019-12-31 | 中国科学院长春光学精密机械与物理研究所 | Ultra-high repetition frequency narrow pulse width CO2Laser device |
| CN110829172A (en) * | 2019-05-09 | 2020-02-21 | 长春理工大学 | Laser output method with repetition frequency 2 times electro-optic Q-switched frequency and laser |
| CN115621820A (en) * | 2022-12-06 | 2023-01-17 | 武汉光谷航天三江激光产业技术研究院有限公司 | Linear polarization output laser structure for effectively compensating thermal depolarization effect |
-
2007
- 2007-03-13 CN CN 200710038022 patent/CN101022203A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102525650A (en) * | 2010-12-09 | 2012-07-04 | 苏州生物医学工程技术研究所 | Holmium laser lithotrity system |
| CN102525650B (en) * | 2010-12-09 | 2014-10-29 | 苏州生物医学工程技术研究所 | Holmium laser lithotrity system |
| CN102545016A (en) * | 2011-03-09 | 2012-07-04 | 北京国科世纪激光技术有限公司 | Laser dual-Q-switching method and device |
| CN102670278A (en) * | 2011-03-11 | 2012-09-19 | 苏州生物医学工程技术研究所 | Holmium laser ultrasonic comprehensive lithotripsy treatment system |
| CN102670278B (en) * | 2011-03-11 | 2015-07-15 | 苏州生物医学工程技术研究所 | Holmium laser ultrasonic comprehensive lithotripsy treatment system |
| CN105723577A (en) * | 2013-10-31 | 2016-06-29 | 富士胶片株式会社 | Laser device and photoacoustic measurement device |
| CN105723577B (en) * | 2013-10-31 | 2019-11-05 | 富士胶片株式会社 | Laser aid and optoacoustic measuring arrangement |
| CN104242044A (en) * | 2014-09-29 | 2014-12-24 | 西安理工大学 | Electro-optical double-refraction double-cavity double-frequency Nd:YAG laser device and frequency difference tuning method |
| CN105161961A (en) * | 2015-09-30 | 2015-12-16 | 中国科学院合肥物质科学研究院 | Micro-pulse laser radar light source with high pulse energy |
| CN105322423A (en) * | 2015-11-15 | 2016-02-10 | 西南技术物理研究所 | Dual-total reflective mirror composite resonant cavity of Nd:YAG electro-optic Q-switched laser |
| CN105281193A (en) * | 2015-11-19 | 2016-01-27 | 中国科学院合肥物质科学研究院 | A laser structure capable of effectively compensating for a thermal depolarization effect and outputting 2.79-micron laser |
| CN105762637A (en) * | 2016-04-18 | 2016-07-13 | 长春理工大学 | Q-switching laser for improving Q-switching performance |
| CN105762637B (en) * | 2016-04-18 | 2018-12-25 | 长春理工大学 | It is a kind of to improve the Q-switched laser for adjusting Q performance |
| CN108306167A (en) * | 2018-01-22 | 2018-07-20 | 武汉安扬激光技术有限责任公司 | A kind of multichannel mode-locked all fibre resonant cavity |
| CN108346971A (en) * | 2018-04-08 | 2018-07-31 | 北京华宇德信光电技术有限公司 | A kind of acousto-optic Q modulation frequency double laser using electrooptical switching control laser output |
| CN110829172A (en) * | 2019-05-09 | 2020-02-21 | 长春理工大学 | Laser output method with repetition frequency 2 times electro-optic Q-switched frequency and laser |
| CN110635349A (en) * | 2019-09-27 | 2019-12-31 | 中国科学院长春光学精密机械与物理研究所 | Ultra-high repetition frequency narrow pulse width CO2Laser device |
| CN110635349B (en) * | 2019-09-27 | 2021-01-05 | 中国科学院长春光学精密机械与物理研究所 | Ultra-high repetition frequency narrow pulse width CO2Laser device |
| CN115621820A (en) * | 2022-12-06 | 2023-01-17 | 武汉光谷航天三江激光产业技术研究院有限公司 | Linear polarization output laser structure for effectively compensating thermal depolarization effect |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101022203A (en) | Double-electro-optic modulation QNdi:YAG laser | |
| WO2010127521A1 (en) | Passively mode-locking picosecond laser | |
| CN210201151U (en) | All-solid-state green laser | |
| CN103618205A (en) | Full-solid-state single longitudinal mode yellow light laser | |
| CN102136670A (en) | Double-end end-pumped solid laser based on polarization coupling | |
| CN100428587C (en) | Laser diode side pumped thulium/holmium double doped lithium lutetium fluoride crystal laser | |
| CN110086070B (en) | Novel thin-chip laser structure with high pumping absorption and high power output | |
| CN103296570A (en) | Single longitudinal mode frequency-conversion all-solid-state laser based on non-planar ring cavity structure | |
| CN102280812A (en) | Side-pumped high-power laser device | |
| CN1848559A (en) | Semiconductor double-end pumping solid laser | |
| JP2002141588A (en) | Solid state laser device and solid state laser system | |
| CN102074889B (en) | Single frequency visible laser | |
| CN106058632B (en) | A kind of adjustable passive Q-adjusted raman laser system of pulse energy based on bonded crystals | |
| CN201032670Y (en) | Dual electro-optic Q-switching Nd:YAG laser | |
| CN103311794A (en) | Solid laser with annular polarization compensation | |
| CN101345389B (en) | Full-solid state five-wavelength simultaneously outputting laser device and 5-wavelength laser generation method | |
| CN1105409C (en) | Frequency-doubling diode-pumped solid-state laser | |
| Chen et al. | High power Q-switched TEM 00 Nd: YVO 4 laser with self-adaptive compensation of thermal lensing effect | |
| CN206116866U (en) | High temperature LD pumping quadrature porro prism polarization coupling output cavity | |
| Yang et al. | A compact passively Q-switched intra-cavity frequency doubled Nd: YAG/Cr 4+: YAG composite crystal green laser | |
| CN102244348A (en) | Air-cooled all-solid 526nm pulsed laser | |
| CN105281189A (en) | Wide temperature range laser based on hexagon plate strip structure | |
| CN102157897B (en) | Pulse width-adjustable solid laser | |
| CN109301684A (en) | The solid state laser that diode is pumped in advance-normally pumped | |
| CN202550278U (en) | Intracavity fiber coupling laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |