CN101335424A - Polarization coupled parallel Q modulating solid laser - Google Patents
Polarization coupled parallel Q modulating solid laser Download PDFInfo
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- CN101335424A CN101335424A CNA2008100483745A CN200810048374A CN101335424A CN 101335424 A CN101335424 A CN 101335424A CN A2008100483745 A CNA2008100483745 A CN A2008100483745A CN 200810048374 A CN200810048374 A CN 200810048374A CN 101335424 A CN101335424 A CN 101335424A
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Abstract
The invention discloses a solid Q-modulation laser of polarizing coupling parallel type, which comprises a first holophote which is arranged in a same optical path, a first Q-modulation component, a polarizing beam splitter, a first laser medium and an output mirror. The Q-modulation laser is characterized in that a branch of the polarizing beam splitter is provided with a second holophote; a resonance cavity structure of polarizing coupling parallel type can compensate the energy for the depolarization loss of the polarizing beam splitter to lead the laser to reenter the resonance cavity for resonance; by the polarizing beam splitting to laser by the polarizing beam splitter, the resonance cavity is formed into two parallel branches with orthogonal polarization and energy compensation; laser in the two parallel branches is provided with full linear polarizing characteristics while the coupling part of the two branches has partial orthogonal polarization laser characteristics. The laser of the invention not only realizes the recycle of the depolarization loss, increases laser conversion efficiency and improves beam quality, but also obtains the output of laser with polarization characteristics.
Description
Technical field
The invention belongs to laser technique, be specifically related to a kind of polarization coupled parallel Q solid state laser.
Background technology
Obtain the laser output of high-average power, high-peak power, high light beam quality, be the hot issue in laser development field always.At present, to high power continuous solid body laser (more than the 100W), realize that the most modes that adopt two groups of acoustooptic switch of series connection to form orthogonal ultrasonic field of Q-regulating technique realize that this method has increased the debugging difficulty of resonant cavity undoubtedly, increased and inserted loss in the chamber, reduced power output.And for pulse laser, the electric-optically Q-switched technology of general employing, usually need to insert polarizer, cause a part of polarised light to lose, reduced the output energy, on the other hand, in the Q-switched laser of high repetition frequency, owing to the thermal birefringence effect of laser crystal, can increase the depolarization loss of resonant cavity greatly, cause the decline of the output zlasing mode of laser.
Summary of the invention
The object of the present invention is to provide a kind of polarization coupled parallel Q solid state laser, this Q-switch solid laser can overcome existing club-shaped solid laser device and transfer all drawbacks of moving under the Q state, not only realized the utilization again of depolarization loss, increase laser-conversion efficiency, improved the laser output that beam quality and acquisition have polarization characteristic.
Polarization coupled parallel Q solid state laser provided by the invention, it comprises first total reflective mirror that is positioned on the same light path, first Q-switching device, polarizing beam splitter mirror, first laser medium, and outgoing mirror, it is characterized in that: a branch road of polarizing beam splitter mirror is positioned on the described light path, is placed with second total reflective mirror on another branch road.
On the basis of existing laser resonant cavity layout, propose to have the parallel cavity resonator structure of polarization coupled, polarizing beam splitter mirror depolarization loss energy is partly compensated, this part laser is reentered carry out resonance in the resonant cavity; By the polarization beam splitting effect of polarizing beam splitter mirror to laser, make resonant cavity form the parallel branch of two cross-polarizations, energy compensating, branch road inner laser two parallel connections has the inclined to one side characteristic of line completely, and has the laser characteristics of part cross-polarization at the coupling unit of two branch roads.Therefore can be by electric-optically Q-switched device on Synchronization Control two parallel branches or the direct A-O Q-switch device on the control coupling branch road, the switching process that realizes transferring Q, the laser that obtains high-average power, high-peak power, high light beam quality is exported.Particularly, the present invention has the following advantages:
(1) utilize the principle of polarization spectro, the laser of higher-wattage is decomposed, the electric-optically Q-switched control of working in coordination with in each branch road respectively reduces the requirement of Q-switching device, reaches efficient operation.
(2) utilize the principle of polarization spectro, on the coupling branch road, adopt the control of acousto-optic Q modulation, when reaching efficient operation, can obtain the polarization output of laser.
(3) for adopting polarization spectroscope to carry out the Q-switched laser of parallel coupled, by the coupling of branch energy, the modeling ability of the depolarization loss of compensation laser medium, increase resonant cavity has realized the output of polarization or partial poolarized light.
(4) in the resonant cavity of polarization coupled and uniting and adjustment Q, by whether adopting λ/4 wave plates, increased the exchange capacity of each sub-chamber in parallel energy, realized the change of output laser polarization state.When not putting into λ/4 wave plates in the resonant cavity, the laser of output is part cross-polarization, and after inserting λ/4 wave plates, output laser is part circular polarization, can effectively change the polarization state of output laser.
(5) it is long that the method for parallel Q has effectively been compressed the chamber of laserresonator, can obtain higher electro-optical efficiency.
Description of drawings
Fig. 1 is the schematic diagram of first kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 2 is the schematic diagram of second kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 3 is the schematic diagram of the third embodiment of parallel Q solid state laser of polarization coupled;
Fig. 4 is the schematic diagram of the 4th kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 5 is the schematic diagram of the 5th kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 6 is the schematic diagram of the 6th kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 7 is the schematic diagram of the 7th kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 8 is the schematic diagram of the 8th kind of embodiment of parallel Q solid state laser of polarization coupled;
Fig. 9 is the schematic diagram of the 9th kind of embodiment of parallel Q solid state laser of polarization coupled.
Embodiment
The present invention by different embodiments, has realized having laser in different polarization states output on the basis of the parallel cavity resonator structure of polarization coupled.According to the difference of the parallel resonant cavity layout of polarization coupled, Q-switching device can be that A-O Q-switch device also can be electric-optically Q-switched device; Working-laser material can be one also can be two; Pumping source can be that photoflash lamp also can be a semiconductor laser light source, and its working method can be continuous or pulsed mode.Below in conjunction with accompanying drawing and example multiple specific implementation of the present invention is described.
Shown in Figure 1, this laser comprises first, second total reflective mirror 1 and 6, first, second Q- switching device 2 and 7, polarizing beam splitter mirror 3, laser medium 4, outgoing mirror 5.First total reflective mirror, 1, the first Q-switching device 2, polarizing beam splitter mirror 3, laser medium 4, and outgoing mirror 5 is positioned on the same light path successively, and second total reflective mirror 6 is positioned at another branch road of polarizing beam splitter mirror 3, and second Q-switching device 7 is between second total reflective mirror 6 and polarizing beam splitter mirror 3.First, second Q- switching device 2 and 7 can be that two A-O Q-switch devices also can be two electric-optically Q-switched devices, and they place respectively on two branch roads between beam splitter 3 and total reflective mirror 1 and 6.
Total reflective mirror 1,6 and polarizing beam splitter mirror 3 constitute two parallel branches, and are coupled and outgoing mirror 5 formation resonant cavitys by polarizing beam splitter mirror.Polarizing beam splitter mirror 3 is polarizers, and it can be the polariscope of placing with the Brewster angle, also can be other optical elements that inclined to one side beam splitting effect has been arranged, as Glan prism etc.; Laser medium can be used flash lamp pumping, also can use semiconductor diode pump.
Operation principle is: polarizing beam splitter mirror 3 is divided into laser and has the orthogonal two-way of polarization state, forms two sub resonant cavities respectively between outgoing mirror and two total reflective mirrors.Two-way laser closes bundle once more by polarizing beam splitter mirror 3, passes laser medium, from outgoing mirror 5 output laser.Two branch roads have compensated mutually because the depolarization loss that the thermal stress birefringence of rod-shaped laser medium is brought has improved the beam quality of exporting laser.Because the laser in two branch roads is line polarisation completely, thus on two branch roads the Q-switching device of layout can be electric-optically Q-switched also can be A-O Q-switch device.Such Q-switching device all can effectively turn-off the light path in the resonant cavity, realize the high loss state of resonant cavity, make that laserresonator can not starting of oscillation, by the time after the accumulation of the inverted population in the laser medium 4, control Q-switching device 2 is in the low-loss state, the laser resonance cavity oscillations, and a large amount of inverted populations were consumed in moment, produce and transfer the Q giant pulse, form laser output with part cross-polarization characteristic from outgoing mirror 5 outputs.
As shown in Figure 2, different is first total reflective mirror 1 for the structure of second kind of embodiment of the present invention and first kind of execution mode, laser medium 4, and polarizing beam splitter mirror 3, the first Q-switching devices 2, and outgoing mirror 5 is positioned on the same light path successively, other structure is identical.
The laser that this structure is obtained from outgoing mirror 5 has the extreme light output of complete line, therefore compares with embodiment 1, and when Q-switching device was opened, the laser that generation transfers the giant pulse of Q to export from outgoing mirror 5 was complete linearly polarized light.
Fig. 3 is the schematic diagram of the parallel Q solid state laser embodiment 3 of polarization coupled, compared to Figure 1, this scheme only on the basis of embodiment 1 parallel resonance cavity configuration, has increased a λ/4 wave plates 8 on the coupling branch road, other devices and operation principle and Fig. 1 are identical.The adding of λ/4 wave plates 8 has strengthened the coupling ability of two-way parallel branch energy.And make the laser that forms at outgoing mirror 5 places have the characteristic of part rotatory polarization.
Fig. 4 is the schematic diagram of the parallel Q solid state laser embodiment 4 of polarization coupled, and this layout is similar with embodiment 2, has only increased a λ/4 wave plates 8 on the coupling branch road.Other devices and operation principle and Fig. 2 are identical.The adding of λ/4 wave plates 8 has strengthened the coupling ability of two-way parallel branch energy, and forms at outgoing mirror 5 places and to have the inclined to one side laser output of line.
Fig. 5 is the schematic diagram of the parallel Q solid state laser embodiment 5 of polarization coupled, this scheme comprises two total reflective mirrors 1 and 6, two Q- switching devices 2,7 can be that electric-optically Q-switched device also can be an A-O Q-switch device, polarizing beam splitter mirror 3, outgoing mirror 5 and two laser mediums 4,9.
Two laser mediums 4,9 are placed on respectively on two branch roads, and are coupled by polarizing beam splitter mirror 3, form output at outgoing mirror 5 places.
Operation principle is: beam splitter 3 becomes two-way light with laser beam splitter, and two light paths have laser medium separately to form independently resonant cavity respectively, intercouple by polarizing beam splitter mirror 3.Open the control power supply of Q- switching device 2,7, Q- switching device 2,7 is initially located in high loss state, laserresonator can not starting of oscillation, by the time after the accumulation of the inverted population in the laser medium 4,9, control Q- switching device 2,7 is in the low-loss state, the laser resonance cavity oscillations, and a large amount of inverted populations were consumed in moment, convert a large amount of luminous energy to and between two pairs of total reflective mirrors, vibrate respectively, control Q- switching device 2,7 again and be in high loss state.A large amount of luminous energy form transfers the Q giant pulse from outgoing mirror 5 outputs.From the polarization state of outgoing mirror 5 output laser is cross-polarization.
Fig. 6 is the schematic diagram of the parallel Q solid state laser embodiment 6 of polarization coupled, and this laser comprises two total reflective mirrors 1 and 6, and Q-switching device 2 is an acousto-optical device, outgoing mirror 5 and laser medium 4.Polarizing beam splitter mirror 3 forms two branch roads with cross-polarization with total reflective mirror 1 and 6, and be coupling on the coupling branch road by polarizing beam splitter mirror 3 and form laser with cross-polarization, because A-O Q-switch device adopts the diffraction ultrasonic field to turn-off light path in the chamber, polarization state is not selected, and therefore an A-O Q-switch device just can realize that the switch of two branch roads moves on the coupling branch road.Because the control ability of polarization state in 3 pairs of chambeies of polarizing beam splitter mirror, the polarization state that can form two branch roads compensates mutually, has remedied the laser medium depolarization loss, obtains to have the laser output of part cross-polarization at outgoing mirror 5 places.
Fig. 7 is the schematic diagram of the parallel Q solid state laser embodiment 7 of polarization coupled, and geometric layout and Fig. 6 of this laser are basic identical, and just outgoing mirror 5 is different with the position of total reflective mirror 1.Outgoing mirror 5 is set on the polarization branch, and the function of other devices is identical with Fig. 6 with operation principle, therefore can obtain the laser output of linear polarization at outgoing mirror 5 places.
Fig. 8 is the schematic diagram of the parallel Q solid state laser embodiment 8 of polarization coupled, this structure is similar to the layout of Fig. 6, only between laser medium 4 and outgoing mirror 5, λ/4 wave plates 8 have been inserted, the function of other devices and resonant cavity is identical, because the existence of wave plate has strengthened the coupling ability of two the sub-chamber of parallel connection energy, make the laser of outgoing mirror 5 places output have the circularly polarized characteristic of part.
Fig. 9 is the schematic diagram of the parallel Q solid state laser embodiment 9 of polarization coupled, the structure of this structure and Fig. 7 is basic identical, only inserted a λ/4 wave plates 8 between total reflective mirror 1 and working-laser material 4, function and Fig. 7 of other device resonant cavity are identical.The adding of λ/4 wave plates 8 increases the coupling of two parallel branch energy, makes can obtain linearly polarized light output completely at outgoing mirror 5 places.
During specific implementation, first total reflective mirror, 1, the first Q-switching device 2, polarizing beam splitter mirror 3, the first laser mediums 4, and the order between the outgoing mirror 5 can also be done other variation, this variation only may bring the difference of output laser polarization characteristic, does not influence the realization of purpose of the present invention and technique effect.
In a word; the present invention is not limited to above-mentioned embodiment; persons skilled in the art are according to content disclosed by the invention; can adopt other multiple embodiment to implement the present invention; therefore; every employing project organization of the present invention and thinking are done some simple designs that change or change, and all fall into the scope of protection of the invention.
Claims (4)
1, a kind of polarization coupled parallel Q solid state laser, it comprises first total reflective mirror (1) that is positioned on the same light path, first Q-switching device (2), polarizing beam splitter mirror (3), first laser medium (4), and outgoing mirror (5), it is characterized in that: a branch road of polarizing beam splitter mirror (3) is positioned on the described light path, is placed with second total reflective mirror (6) on another branch road.
2, according to the described polarization coupled parallel Q of claim (1) solid state laser, it is characterized in that: between second total reflective mirror (6) and polarizing beam splitter mirror (3), be placed with second Q-switching device (7).
3, according to claim (1) or (2) described polarization coupled parallel Q solid state laser, it is characterized in that: be placed with λ/4 wave plates (8) on arbitrary limit of first laser medium (4).
4, according to the described polarization coupled parallel Q of claim (2) solid state laser, it is characterized in that: between polarizing beam splitter mirror (3) and second Q-switching device (7), be placed with second laser medium (9).
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| CN102522684A (en) * | 2011-11-26 | 2012-06-27 | 连天虹 | High-power single-frequency laser resonant cavity structure and control method for wavelength thereof |
| CN102684056A (en) * | 2012-05-16 | 2012-09-19 | 清华大学 | Laser device capable of adjusting optimal transmittance |
| CN102723661A (en) * | 2012-05-02 | 2012-10-10 | 清华大学 | Electro-optic Q-switching and acousto-optic Q-switching pulse laser capable of quickly converting Q-switching modes |
| WO2012162911A1 (en) * | 2011-06-02 | 2012-12-06 | 天津奇谱光电技术有限公司 | External cavity tunable laser |
| CN103928830A (en) * | 2014-05-06 | 2014-07-16 | 上海朗研光电科技有限公司 | Full positive dispersion and full polarization maintaining optical fiber laser |
| CN103996963A (en) * | 2014-06-10 | 2014-08-20 | 鞍山华科大激光科技有限公司 | Q-switched laser with shared output mirror and double resonant cavities |
| 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 |
| CN105556769A (en) * | 2013-09-18 | 2016-05-04 | 富士胶片株式会社 | Solid-state laser device and photoacoustic measurement device |
| CN105720469A (en) * | 2016-04-18 | 2016-06-29 | 长春理工大学 | Laser improving weak pump laser efficiency based on light polarization torsion |
| CN105762637A (en) * | 2016-04-18 | 2016-07-13 | 长春理工大学 | Q-switching laser for improving Q-switching performance |
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2008
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| CN102522684A (en) * | 2011-11-26 | 2012-06-27 | 连天虹 | High-power single-frequency laser resonant cavity structure and control method for wavelength thereof |
| CN102723661B (en) * | 2012-05-02 | 2015-02-18 | 清华大学 | Electro-optic Q-switching and acousto-optic Q-switching pulse laser capable of quickly converting Q-switching modes |
| CN102723661A (en) * | 2012-05-02 | 2012-10-10 | 清华大学 | Electro-optic Q-switching and acousto-optic Q-switching pulse laser capable of quickly converting Q-switching modes |
| CN102684056B (en) * | 2012-05-16 | 2014-09-03 | 清华大学 | Laser device capable of adjusting optimal transmittance |
| CN102684056A (en) * | 2012-05-16 | 2012-09-19 | 清华大学 | Laser device capable of adjusting optimal transmittance |
| CN105556769A (en) * | 2013-09-18 | 2016-05-04 | 富士胶片株式会社 | Solid-state laser device and photoacoustic measurement device |
| CN103928830A (en) * | 2014-05-06 | 2014-07-16 | 上海朗研光电科技有限公司 | Full positive dispersion and full polarization maintaining optical fiber laser |
| CN103996963A (en) * | 2014-06-10 | 2014-08-20 | 鞍山华科大激光科技有限公司 | Q-switched laser with shared output mirror and double resonant cavities |
| 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 |
| CN105720469B (en) * | 2016-04-18 | 2019-02-01 | 长春理工大学 | The laser of weak pumping laser efficiency is improved based on light polarization torsion |
| CN105720469A (en) * | 2016-04-18 | 2016-06-29 | 长春理工大学 | Laser improving weak pump laser efficiency based on light polarization torsion |
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| CN113675707A (en) * | 2021-08-24 | 2021-11-19 | 北京工业大学 | All-solid-state green laser |
| CN113675707B (en) * | 2021-08-24 | 2024-05-24 | 北京直方光电科技有限公司 | All-solid-state green laser |
| CN113725708A (en) * | 2021-08-31 | 2021-11-30 | 廊坊元拓科技有限公司 | Q-switched pulse laser with multi-cavity mirror topological structure |
| 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 |
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