CN101719623A - Full solid-state laser with optical fiber coupling double-end pump - Google Patents
Full solid-state laser with optical fiber coupling double-end pump Download PDFInfo
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- CN101719623A CN101719623A CN200910223139A CN200910223139A CN101719623A CN 101719623 A CN101719623 A CN 101719623A CN 200910223139 A CN200910223139 A CN 200910223139A CN 200910223139 A CN200910223139 A CN 200910223139A CN 101719623 A CN101719623 A CN 101719623A
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Abstract
The invention relates to a laser, in particular to a full solid-state laser with an optical fiber coupling double-end pump, comprising a first pump source, a second pump source, a U-shaped type resonant cavity, a first gain medium and a second medium, wherein the U-shaped resonant cavity mainly consists of a plane total reflecting mirror, an output coupling mirror and two diphase color mirrors. The output coupling mirror and the plane total reflecting mirror are respectively arranged at the back of the first gain medium and the second medium, the first diphase color mirror and the second diphase color mirror are respectively arranged on a pump optical path of the first pump source and a pump optical path of the second pump source, and form a certain included angle of 90 degrees with the pump optical paths. The invention aims to design the full solid-state laser with the optical fiber coupling double-end pump which has large output power. Compared with the prior art, the invention has the advantages of better quality of light beams, favorable dynamic output stability of laser basic mode, better long-term work stability and the like.
Description
Technical field
The present invention relates to laser, particularly a kind of full solid-state laser with optical fiber coupling double-end pump.
Background technology
The semiconductor diode pump all solid state laser is to replace photoflash lamp to remove the laser of pumped solid laser gain media with laser diode.As far back as the sixties, be the fluorescence output that the radiation pumping Nd:CaWO4 of 880nm has obtained 1064nm with GaAs diode wavelength.Soon, it has been recognized that with LD to replace photoflash lamp to make the efficient height of pumping source the advantage of life-span length and compact conformation after GaAs laser diode (the being called for short LD) invention.But LD is in the requirement that does not all reach pumping source aspect power and the reliability, so research report seldom.The seventies, the power of LD did not have very big breakthrough, but the semiconductor diode pump all solid state laser must be studied at aspects such as new chemical gain material and waveguide lasers and significantly made progress.The eighties, because the appearance of quantum well, the threshold current of LD reduces, and continuous and quasi-continuous power is significantly improved, thereby the work of semiconductor diode pump all solid state laser also steps a stage.
Since the nineties in 20th century, the development of end face pumping all-solid-state laser is maked rapid progress, and becomes the research focus of international and domestic laser technology.According to the size of laser diode and array Output optical power thereof and the characteristics of output beam, end pumping (vertically pumping) and profile pump (laterally pumping) dual mode are arranged usually.End pumping is middle low power LD light-pumped solid state laser a kind of pump mode commonly used, has compact conformation, whole efficiency height, the characteristics that spatial model is good.In the end face pumping all-solid-state laser, the space coherent beam of LD output, along the axial pumping of optical resonator, light beam focuses in the small size of gain media.The parameter of resonant cavity guarantees that the space that excites of pump light resonant cavity mould can overlap well, reaches pattern matching.Overlapping degree directly influences the rate of optical pumping and the quality of output beam.Simultaneously, end pumping is very big in the penetration depth of incident direction, and gain media absorbs fully pump light, thereby pumping threshold power is low, and tiltedly efficient is higher.
Most end face pumping all-solid-state laser, the single end face pump modes that adopt more, owing to be subjected to the thermal stress that thermal effect produces in the crystal can not be above the restriction of the fracture strength of laser crystal, exist the Maximum pumping can not be very high on the gain media unit are, therefore it is less relatively to export laser power, and consequent thermal lensing effect has seriously influenced the beam quality of laser, the stability of long-time running simultaneously also can be subjected to very big influence, makes end face pumping all-solid-state laser be subjected to certain restriction in practical laser is used.
Summary of the invention
The objective of the invention is to design the big full solid-state laser with optical fiber coupling double-end pump of a kind of power output.
In order to achieve the above object, the present invention adopts following technical solution: a kind of full solid-state laser with optical fiber coupling double-end pump, it is characterized in that it comprise first pumping source, second pumping source,
Type resonant cavity, first gain media and second gain media, wherein, described
The type resonant cavity mainly is made up of plane total reflective mirror, output coupling mirror and two two-phase look mirrors, described first gain media is located on the pumping light path of described first pumping source, described output coupling mirror is located at the rear of first gain media, described first two-phase look mirror is located on the pumping light path between first pumping source and first gain media, the pumping light path at described first two-phase look mirror and place is in a certain angle, makes first two-phase look mirror that the harmonic light traffic direction is changed 90 °; Described second gain media is located on the pumping light path of described second pumping source, described plane total reflective mirror is located at the rear of second gain media, described second two-phase look mirror is located on the pumping light path between second pumping source and second gain media, the pumping light path at described second two-phase look mirror and place is in a certain angle, makes second two-phase look mirror that the harmonic light traffic direction is changed 90 °; It is that benchmark carries out the position and is provided with that the harmonic light light path that described first two-phase look mirror and second two-phase look mirror are changed with two-phase look mirror separately coincides together, and first two-phase look mirror and second two-phase look mirror are 90 ° of angles.
Described
Also be provided with Q-switching device in the type resonant cavity, Q-switching device is located at first between gain media and output coupling mirror, or Q-switching device is located on the light path at place between first two-phase look mirror and second the two-phase look mirror.Described Q-switching device is generally A-O Q-switch device, the optional electric light Q-switching device of using when exporting as the need high frequency.
The pumping light path at described first two-phase look mirror and place is 45 ° of angles, the pumping light path at described second two-phase look mirror and place is 135 ° of angles, the side that two-phase look mirror is relative with pump light has been coated with the anti-reflection deielectric-coating of pump light, and the side that two-phase look mirror is relative with harmonic light has been coated with harmonic light be all-trans film and the anti-reflection deielectric-coating of pump light.
Described first pumping source comprises semiconductor laser diode module, optical fiber, optical focusing system, and wherein, described optical focusing system adopts the four-piece type coupled lens to combine.
Each eyeglass curvature in the described coupled lens is: the left curvature and the right radius of curvature of first eyeglass be respectively+46.1mm and+28.5mm; The left curvature and the right radius of curvature of second eyeglass be respectively+762.1mm and+70mm; The left curvature and the right radius of curvature of the 3rd eyeglass be respectively-69.2mm and-796.2mm; The left curvature and the right radius of curvature of the 4th eyeglass be respectively+50.93mm and+54.83mm.
Owing to adopt double-side pumping bicrystal structure can make full use of the volume of active medium, and can stable operation under big pump power, can obtain bigger power output, do not influencing under the stable situation of laser, compare with the single face pump laser, the pump power tolerable doubles, and power output also is increased to about into the single face pumping two times thereupon.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail.
Fig. 1 is a present embodiment structural principle schematic diagram.
Fig. 2 is an optical focusing system structural principle schematic diagram.
Embodiment
As shown in Figure 1, present embodiment comprise the first pumping source A, the second pumping source B,
Type resonant cavity, first gain media 5, second gain media 10 and Q-switching device 7, wherein:
The material of described first gain media 5 and second gain media 10, the various features of geometry are identical.Gain media is generally Nd:YVO4, also can be crystal such as Nd:GdVO4 or Nd:YLF.
Described
The type resonant cavity mainly is made up of plane total reflective mirror 9, output coupling mirror 8 and two two-phase look mirrors 4,11, described first gain media 5 is located on the pumping light path of the described first pumping source A, described output coupling mirror 8 is located at the rear of first gain media 5, described first two-phase look mirror 4 is located on the pumping light path between the first pumping source A and first gain media 5, described first two-phase look mirror 4 is in a certain angle with the pumping light path at place, makes first two-phase look mirror 4 that the harmonic light traffic direction is changed 90 °; Described second gain media 10 is located on the pumping light path of the described second pumping source B, described plane total reflective mirror 9 is located at the rear of second gain media 10, described second two-phase look mirror 11 is located on the pumping light path between the second pumping source B and second gain media 10, described second two-phase look mirror 11 is in a certain angle with the pumping light path at place, makes 90 ° of the light traffic direction changes of will humorous 11 shaking of second two-phase look mirror; It is that benchmark carries out the position and is provided with that the harmonic light light path that described first two-phase look mirror 4 and second two-phase look mirror 11 are changed with two-phase look mirror separately coincides together, and first two-phase look mirror 4 and second two-phase look mirror 11 are 90 ° of angles.
Q-switching device 7 is located between first gain media 5 and the output coupling mirror 8, or Q-switching device 7 is located on the light path at place between first two-phase look mirror 4 and second the two-phase look mirror 11, and it can make laser output with high repetitive frequency pulsed output.
Described first two-phase look mirror 4 is 45 ° of angles with the pumping light path at place, and described second two-phase look mirror 11 is 135 ° of angles with the pumping light path at place.The side that two-phase look mirror is relative with harmonic light has been coated with harmonic light be all-trans film and the anti-reflection deielectric-coating of pump light, and the side that two-phase look mirror is relative with pump light has been coated with the anti-reflection deielectric-coating of pump light.
Two-phase look mirror is coated with the harmonic light film that is all-trans, purpose is to make harmonic light when the resonant cavity interior resonance, can either carry out total reflection, change the harmonic light traffic direction, allow harmonic light noenergy loss herein again, make interior resonance light operation in chamber become folded form, make in the light path each optical element compact more, to reduce the laser entire length by straight line.
Two-phase look mirror both sides are coated with the anti-reflection deielectric-coating of pump light, make pump light before entering gain media on the one hand, can make the most of energy of pump light by two-phase look mirror, reduce the loss herein of its pump energy, enter gain media to greatest extent, reduce the loss of the energy of harmonic light on two-phase look mirror on the other hand.
The described first pumping source A comprises semiconductor laser diode module 1, optical fiber 2, optical focusing system 3, equally, the described second pumping source B also comprises semiconductor laser diode module 13, optical fiber 14, optical focusing system 12, wherein, described semiconductor laser diode module 1 and 13 power output, parameters such as output wavelength are identical, described optical fiber 2 and 14 various parameters are also identical, again as shown in Figure 2, described optical focusing system 3 or 12 all adopts the four-piece type coupled lens to combine, and each the eyeglass curvature in the described coupled lens is: the left curvature and the right radius of curvature of first eyeglass 15 be respectively+46.1mm and+28.5mm; The left curvature and the right radius of curvature of second eyeglass 16 be respectively+762.1mm and+70mm; The left curvature and the right radius of curvature of the 3rd eyeglass 17 be respectively-69.2mm and-796.2mm; The left curvature and the right radius of curvature of the 4th eyeglass 18 be respectively+50.93mm and+54.83mm.
During work, by the diode laser module 1 two bundle pump light light beams equal with 13 while power outputs, two-beam enters into two optical focusing systems 3 and 12 that parameter is identical respectively through coupled fiber 2 and 14, optical focusing system is inhomogeneous to energy, the pump light that hot spot is dispersed carries out shaping, making it to reach spot size is 0.4mm, the pump light of energy even, then by entering into gain media behind two-phase look mirror 4 and 11, two identical gain mediums 5 with produce fluorescent radiation respectively after 10 absorb identical pump energy, the fluorescence that radiation produces is between the laserresonator that total reflective mirror and output coupling mirror are formed
Vibration back and forth in the type light path, resonance oscillations light produces stronger stimulated radiation respectively by two gain medias the time, when
When the number of photons of type resonant cavity interior resonance vibration surpassed the output threshold value of itself, a part of resonant laser light was by output coupling mirror, and producing wavelength is the basic mode laser beam of 1064nm.Along with the increase of pumping light power, laser crystal absorbs more multipotency, and it is also increasing to be excited the energy of the resonance light beam that produces in the resonant cavity, and the laser beam power that produces by output coupling mirror also increases thereupon thus.Finally when gain media injection gross power was 60W (single diode laser module output 30W), the continuous Maximum Power Output of laser was 26.3W, and the corresponding light light conversion efficiency is 43.8%.The bicrystal all solid state laser of the diode laser double-end pumping of this type will have good application future in fields such as military affairs, scientific research, industrial processes.
In sum, the present invention compared with prior art has the following advantages:
1, beam quality is better. The thermal lens that two gain medias produce forms confocal system, effectively avoids the serious thermal lensing effect that single crystal produces under the high power, strengthens the heat endurance of cavity, has improved power output and the laser beam quality of laser.
2, the dynamic output stability of laser basic mode is good. Adopt the two gain medias (laser crystal) of double pump pumping, gradually increase at pumping light power, in the ever-reduced whole process of the thermal focal of corresponding crystal, can keep extraordinary pattern match between pump light and the chamber mould, when just increasing pump power, the change of quality for outputting laser beam is very little, thereby obtains the high-quality laser beam of nearly basic mode high-power output.
3, long-term working stability is better. Adopt bicrystal double pumping action structure, avoid the lens lesion that may cause in the high pumping power density situation, reduce single crystal to producing the burden of heat, increase area of dissipation, also provide possibility for the design of full wind cooling type complete machine radiator structure.
4, the device compactness of arranging. Adopt twice folding
Die cavity has dwindled the laser instrument entire length greatly, and it is more compact that device integral body is arranged.
Claims (5)
1. full solid-state laser with optical fiber coupling double-end pump, it is characterized in that it comprise first pumping source (A), second pumping source (B),
Type resonant cavity, first gain media (5) and second gain media (10), wherein, described
The type resonant cavity is mainly by plane total reflective mirror (9), output coupling mirror (8) and two two-phase look mirrors (4), (11) form, described first gain media (5) is located on the pumping light path of described first pumping source (A), described output coupling mirror (8) is located at the rear of first gain media (5), described first two-phase look mirror (4) is located on the pumping light path between first pumping source (A) and first gain media (5), described first two-phase look mirror (4) is in a certain angle with the pumping light path at place, makes first two-phase look mirror (4) that the harmonic light traffic direction is changed 90 °; Described second gain media (10) is located on the pumping light path of described second pumping source (B), described plane total reflective mirror (9) is located at the rear of second gain media (10), described second two-phase look mirror (11) is located on the pumping light path between second pumping source (B) and second gain media (10), the pumping light path at described second two-phase look mirror (11) and place is in a certain angle, makes second two-phase look mirror that humorous (11) the light traffic direction that shakes is changed 90 °; It is that benchmark carries out the position and is provided with that the harmonic light light path that described first two-phase look mirror (4) and second two-phase look mirror (11) are changed with two-phase look mirror separately coincides together, and first two-phase look mirror (4) is 90 ° of angles with second two-phase look mirror (11).
2. full solid-state laser with optical fiber coupling double-end pump according to claim 1 is characterized in that described
Also be provided with Q-switching device (7) in the type resonant cavity, Q-switching device (7) is located at first between gain media (5) and output coupling mirror (8), or Q-switching device (7) is located on the light path at place between first two-phase look mirror (4) and second the two-phase look mirror (11).
3. full solid-state laser with optical fiber coupling double-end pump according to claim 2, it is characterized in that described first two-phase look mirror (4) and the pumping light path at place are 45 ° of angles, described second two-phase look mirror (11) is 135 ° of angles with the pumping light path at place, the side that two-phase look mirror is relative with harmonic light has been coated with harmonic light be all-trans film and the anti-reflection deielectric-coating of pump light, and the side that two-phase look mirror is relative with pump light has been coated with the anti-reflection deielectric-coating of pump light.
4. full solid-state laser with optical fiber coupling double-end pump according to claim 3, it is characterized in that described first pumping source (A) comprises semiconductor laser diode module (1), optical fiber (2), optical focusing system (3), wherein, described optical focusing system (3) adopts the four-piece type coupled lens to combine.
5. full solid-state laser with optical fiber coupling double-end pump according to claim 4 is characterized in that each the eyeglass curvature in the described coupled lens is: the left curvature and the right radius of curvature of first eyeglass (15) be respectively+46.1mm and+28.5mm; The left curvature and the right radius of curvature of second eyeglass (16) be respectively+762.1mm and+70mm; The left curvature and the right radius of curvature of the 3rd eyeglass (17) be respectively-69.2mm and-796.2mm; The left curvature and the right radius of curvature of the 4th eyeglass (18) be respectively+50.93mm and+54.83mm.
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| CN200910223139A CN101719623A (en) | 2009-11-13 | 2009-11-13 | Full solid-state laser with optical fiber coupling double-end pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390854A (en) * | 2013-06-26 | 2013-11-13 | 温州市德罗斯激光科技有限公司 | Double single-ended pumped two-rod series connection solid state laser |
| CN108963741A (en) * | 2018-09-21 | 2018-12-07 | 深圳市杰普特光电股份有限公司 | Bicrystal green (light) laser |
| CN109119875A (en) * | 2018-09-21 | 2019-01-01 | 深圳市杰普特光电股份有限公司 | Bicrystal infrared laser |
-
2009
- 2009-11-13 CN CN200910223139A patent/CN101719623A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390854A (en) * | 2013-06-26 | 2013-11-13 | 温州市德罗斯激光科技有限公司 | Double single-ended pumped two-rod series connection solid state laser |
| CN108963741A (en) * | 2018-09-21 | 2018-12-07 | 深圳市杰普特光电股份有限公司 | Bicrystal green (light) laser |
| CN109119875A (en) * | 2018-09-21 | 2019-01-01 | 深圳市杰普特光电股份有限公司 | Bicrystal infrared laser |
| CN109119875B (en) * | 2018-09-21 | 2019-09-06 | 深圳市杰普特光电股份有限公司 | Bicrystal infrared laser |
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Open date: 20100602 |