CN102244347A - End-pumped laser with tilting reflecting mirror - Google Patents
End-pumped laser with tilting reflecting mirror Download PDFInfo
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- CN102244347A CN102244347A CN2011101628508A CN201110162850A CN102244347A CN 102244347 A CN102244347 A CN 102244347A CN 2011101628508 A CN2011101628508 A CN 2011101628508A CN 201110162850 A CN201110162850 A CN 201110162850A CN 102244347 A CN102244347 A CN 102244347A
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Abstract
The invention relates to an end-pumped laser with a tilting reflecting mirror. Pump light which is emitted by a pump laser is coupled into a laser crystal by utilizing a coupling lens; the residual pump lights in the laser crystal are reflected by the tilting reflecting mirror again to enter into the laser crystal after the pump light is emitted out of the laser crystal, wherein the tilting reflecting mirror tilts relative to a pump light outgoing end face and is positioned at the end face.
Description
Technical field
The present invention relates to a kind of laser, relate generally to a kind of solid state laser, belong to the photoelectron technology field.
Background technology
Gas or solid state laser are lasers very commonly used at present, present employed solid state laser uses LD to carry out pumping mostly, pump light is entered in the resonant cavity that is provided with gain medium by end face or side, so that gain medium is carried out pumping, thereby generation laser, the laser that is produced may be fundamental frequency light, and this fundamental frequency light is not that we are needed, may also need increase a frequency-doubling crystal in intra resonant cavity or outside this moment, realize the frequency multiplication of fundamental frequency light, thereby obtain our needed laser.End pumping of the prior art as shown in Figure 1, it comprises pumping source 1.1, coupled lens 1.2 and laser crystal 1.3.Wherein pumping source 1.1 and coupled lens 1.2 all are positioned at the distolateral of laser crystal, this structure is an end pumping, generally speaking, the pump light input of laser crystal 1.3 is coated with the pump light anti-reflection film, fundamental frequency light high-reflecting film, and an other end of laser crystal 1.3 is coated with the pump light high-reflecting film in order to realize making full use of the purpose of pump light, so that the remaining pump light that is not fully utilized enters the pumping effect of laser crystal realization to laser crystal once more.At said structure, also may be not have above-mentioned film layer structure, and a mirror respectively is set that respectively as the chamber mirror, using plated film then is to have replaced the chamber mirror with rete in the both sides of laser crystal at the two ends of laser crystal.But no matter for which kind of situation, if being set at the exit end of laser crystal, the high-reflecting film of pump light all can bring a problem, that is exactly may all not absorbed by laser crystal after pump light is reflected back toward laser crystal, then cause a part of pump light to be reflected back toward pump laser source, this has just produced two problems, a problem is that pump light reflected back pumping source may destroy or influence pumping source, thereby being exactly pump light, the another one aspect leaked out laser crystal generation waste, if but the pump light high-reflecting film is not set at the laser crystal exit end, then can produce the heavy losses of pump light.
Accompanying drawing 2 shows that another makes full use of the technology of pump light in the prior art, it is to be applied on the The slab geometry laser, comprising slab gain media 4, wherein the part of slab gain media 4 except the slit 5 that is used to pass pump light 3 all is coated with the high-reflecting film of pump light, wherein pump light 3 is sent by pump light source 1 and is coupled into slit 5 by coupled system 2, like this, the pump light that enters in the slab gain media 4 will repeatedly reflect in the slab gain media, can not expose this gain media, thereby realize making full use of of pump light.But this technology is effective for the slab gain media, for columned gain media effect and bad, its reason is in columned gain media, laser generation often is created on the central axis of cylinder, if and adopt the pump mode of above-mentioned slit, then the zone of pump light effect is in outside the central axis of cylinder mostly, thereby the zone that makes laser generation take place does not overlap with the zone of pump light excitation, though pump light does not expose gain media, but major part has still slatterned with the form of heat, not only do not play the effect that makes full use of pump light, can bring serious heat problem on the contrary.And this technical pattern complexity, and the profile pump technology of utilizing, and in actual conditions, because the restriction of conditioned disjunction assembling, we may can only adopt the end pumping technology.
The present invention proposes at above-mentioned problem, and a kind of end-pumped laser is provided, and it can be good at solving the problems of the technologies described above.
Summary of the invention
According to one embodiment of the invention, a kind of laser of end pumping is provided, comprise: pump laser, coupled lens and cylindrical laser crystal, wherein coupled lens is used for the pump light that pump laser sends is coupled into the cylindrical laser crystal, remaining pump light is by the laser crystal first end face outgoing in the cylindrical laser crystal, this first end face is relative with second end face that pump light enters laser crystal, it is characterized in that: the speculum that is provided with described relatively first end slope in described first end, this speculum is with the remaining pump light of described outgoing once more in the reflected back laser crystal, and except that the subregion, all be coated with the pump light reflectance coating on the peripheral surface of laser crystal, described subregion is distributed on described first end face and second end face, and the zone that this part is not plated reflectance coating can guarantee that above-mentioned pump light is coupled into laser crystal by second end face, and can guarantee described remaining pump light by the laser crystal first end face outgoing and described inclined mirror with the remaining pump light of described outgoing once more in the reflected back laser crystal.
Preferably, except that entering position with outgoing, pump light all is coated with the pump light reflectance coating on the peripheral surface of described laser crystal.
Preferably, the angle of described relatively first end slope of described inclined mirror is below 10 degree.
Preferably, be coated with the anti-reflection film of laser crystal laser on the described inclined mirror.
Preferably, the minimum range between described inclined mirror and described first end face is 0.
According to another embodiment, a kind of method of end-pumped laser is provided, use pump light that coupled lens sends pump laser to be coupled into laser crystal by second end face of laser crystal, remaining pump light penetrates and is tilted speculum after the laser crystal and reflects once more and enter in the laser crystal in laser crystal, wherein said inclined mirror is with respect to the exit end face tilt of pump light, this outgoing end face is first end face relative with described second end face, and this inclined mirror is positioned at described first end, except that the subregion, all be coated with the pump light reflectance coating on the peripheral surface of described laser crystal, described subregion is distributed on described first end face and second end face, and the zone that this part is not plated reflectance coating can guarantee that above-mentioned pump light is coupled into laser crystal by second end face, and can guarantee described remaining pump light by the laser crystal first end face outgoing and described inclined mirror with the remaining pump light of described outgoing once more in the reflected back laser crystal.
Preferably, except that entering position with outgoing, pump light all is coated with the pump light reflectance coating on the peripheral surface of described laser crystal.
Preferably, the angle of described relatively first end slope of described inclined mirror is below 10 degree.
Preferably, be coated with the anti-reflection film of laser crystal laser on the described inclined mirror.
Preferably, the minimum range between described inclined mirror and described first end face is 0.
Description of drawings
Accompanying drawing 1 is the schematic diagram of end pumping in the prior art;
Accompanying drawing 2 is schematic diagrames of side pump bar laser in the prior art;
Accompanying drawing 3 is schematic diagrames of end pumping among the present invention.
Accompanying drawing 4 is the subregional enlarged drawings in accompanying drawing 3 middle parts, has wherein also shown the process that pumping is reflected.
Embodiment
To on basis in conjunction with the accompanying drawings, describe laser of the present invention in detail below, this laser comprises: pump laser 1.1, coupled lens 1.2 and cylindrical laser crystal 1.3, wherein coupled lens is used for the pump light that pump laser sends is coupled into cylindrical laser crystal 1.3, remaining pump light is by the laser crystal first end face outgoing in the cylindrical laser crystal 1.3, this first end face is relative with second end face that pump light enters laser crystal, be provided with the speculum 1.4 of described relatively first end slope in described first end, this speculum 1.4 is with the remaining pump light of described outgoing once more in the reflected back laser crystal, and all is coated with the pump light reflectance coating on the peripheral surface of laser crystal except that pump light enters position with outgoing.
To introduce the operation principle of this laser below, the pump light of pump laser 1.1 outputs may have the end face ejaculation laser crystal of remainder 1.5 by laser crystal afterwards in entering into laser crystal 1.3, this remainder 1.5 is tilted speculum 1.4 reflections, its propagation path is different from original walking path after being reflected, owing to except that pump light enters position with outgoing, all be coated with the pump light reflectance coating on the peripheral surface of laser crystal, then be reflected back toward pump light in the laser crystal will be in laser crystal reflecting repeatedly, its probability that leaks out laser crystal once more is very little.Like this, because this part pump light has been reflected back toward in the laser crystal again, it can obtain utilizing once more, and also can not turn back in the pump laser 1.1, also can not exert an influence to pump laser 1.1.Though following situation may take place, also promptly be reflected back toward the pump light in the laser crystal 1.3 once more, operating availability is not very high for columniform laser crystal, but what return owing to be reflected this moment is remaining pump light, so it can not produce very big heat problem, and wherein some can be utilized again, even so in columniform laser crystal, also can obtain effect preferably, pump in accordance with the present invention Pu technology, when avoiding superfluous pump light reflected back pump laser, also realize making full use of of pump light, well solved existing problem in the present end pumping.
If it is not very high requiring, wherein whole of two of laser crystal 1.3 end faces all can not plated the pump light reflectance coating, help the setting of inclined mirror 1.4 and pump laser and coupled lens like this, leak out the big risk of laser crystal probability but may just need bear pump light this moment.
Be preferably below 10 degree for the angle of inclined mirror 1.4 with respect to first end slope, more preferably below 5 degree, in this case, as shown in Figure 4, wherein 1.5 represent the process that residual pump lights are reflected, because it is very near with the position distance that enters laser crystal once more that pump light penetrates the position of laser crystal, can relax the requirement to plated film this moment, the pump light reflectance coating is not plated in the position that does not only yet promptly need to enter or to penetrate laser crystal at pump light, and just near entering the position of laser crystal, do not plate pump light on second end face pump light reflectance coating, the size in this zone depends primarily on the size of pump light beam diameter, and do not plate the pump light reflectance coating penetrate and enter the position of laser crystal at the pump light of first end face near, obviously, the angle of inclination of inclined mirror 1.4 is more little, then do not need the area of plated film just more little on first end face, just can guarantee that not having pump light leaks out laser crystal more.The factor that another one influences non-coating film area area size on second end face is the distance between the inclined mirror 1.4 and first end face, obviously, distance is short more, and then the area of non-coating film area is just more little, so the minimum range between the preferred angled speculum 1.4 and first end face is 0.
For the laser generation to laser crystal not exerts an influence, preferably on inclined mirror 1.4, be coated with laser crystal laser anti-reflection film.
Use the method for pumping of said apparatus as follows: to use coupled lens that the pump light that pump laser sends is coupled into laser crystal, remaining pump light penetrates and is tilted speculum after the laser crystal and reflects once more and enter in the laser crystal in laser crystal, wherein said inclined mirror be with respect to the exit end face tilt of pump light and this inclined mirror be positioned at this end.
Claims (10)
1. the laser of an end pumping, comprise: pump laser, coupled lens and cylindrical laser crystal, wherein coupled lens is used for the pump light that pump laser sends is coupled into the cylindrical laser crystal, remaining pump light is by the laser crystal first end face outgoing in the cylindrical laser crystal, this first end face is relative with second end face that pump light enters laser crystal, it is characterized in that: the speculum that is provided with described relatively first end slope in described first end, this speculum is with the remaining pump light of described outgoing once more in the reflected back laser crystal, and except that the subregion, all be coated with the pump light reflectance coating on the peripheral surface of laser crystal, described subregion is distributed on described first end face and second end face, and the zone that this part is not plated reflectance coating can guarantee that above-mentioned pump light is coupled into laser crystal by second end face, and can guarantee described remaining pump light by the laser crystal first end face outgoing and described inclined mirror with the remaining pump light of described outgoing once more in the reflected back laser crystal.
2. laser according to claim 1 is characterized in that: all be coated with the pump light reflectance coating on the peripheral surface of described laser crystal except that pump light enters position with outgoing.
3. laser according to claim 1 and 2, the angle of described relatively first end slope of described inclined mirror are below 10 degree.
4. laser according to claim 1 and 2 is coated with the anti-reflection film of laser crystal laser on the described inclined mirror.
5. laser according to claim 1 and 2, the minimum range between described inclined mirror and described first end face is 0.
6. the method for an end-pumped laser, use pump light that coupled lens sends pump laser to be coupled into columniform laser crystal by second end face of columniform laser crystal, remaining pump light penetrates and is tilted speculum after the laser crystal and reflects once more and enter in the described laser crystal in described laser crystal, wherein said inclined mirror is with respect to the exit end face tilt of pump light, this outgoing end face is first end face relative with described second end face, and this inclined mirror is positioned at described first end, except that the subregion, all be coated with the pump light reflectance coating on the peripheral surface of described laser crystal, described subregion is distributed on described first end face and second end face, and the zone that this part is not plated reflectance coating can guarantee that above-mentioned pump light is coupled into laser crystal by second end face, and can guarantee described remaining pump light by the laser crystal first end face outgoing and described inclined mirror with the remaining pump light of described outgoing once more in the reflected back laser crystal.
7. method according to claim 6 is characterized in that: all be coated with the pump light reflectance coating on the peripheral surface of described laser crystal except that pump light enters position with outgoing.
8. according to the method for claim 6 or 7, it is characterized in that: the angle of described relatively first end slope of described inclined mirror is below 10 degree.
9. according to the method for claim 6 or 7, it is characterized in that: the anti-reflection film that is coated with laser crystal laser on the described inclined mirror.
10. according to the method for claim 6 or 7, it is characterized in that: the minimum range between described inclined mirror and described first end face is 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101628508A CN102244347B (en) | 2011-06-14 | 2011-06-14 | End-pumped laser with tilting reflecting mirror |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101628508A CN102244347B (en) | 2011-06-14 | 2011-06-14 | End-pumped laser with tilting reflecting mirror |
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| CN102244347A true CN102244347A (en) | 2011-11-16 |
| CN102244347B CN102244347B (en) | 2012-11-14 |
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| CN2011101628508A Expired - Fee Related CN102244347B (en) | 2011-06-14 | 2011-06-14 | End-pumped laser with tilting reflecting mirror |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602391A (en) * | 2016-12-09 | 2017-04-26 | 中国人民解放军海军航空工程学院 | Slab laser module with wave-front distortion self-correction ability |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3697888A (en) * | 1971-04-05 | 1972-10-10 | Bell Telephone Labor Inc | Evanescent wave coupling technique for beam shaping |
| US4945544A (en) * | 1988-03-29 | 1990-07-31 | Rohm Co., Ltd. | Diode laser pumped solid-state laser |
| US6526088B1 (en) * | 1998-01-06 | 2003-02-25 | Yong Cheng | Alignment-free solid laser apparatus |
| CN2620399Y (en) * | 2003-05-14 | 2004-06-09 | 中国科学院安徽光学精密机械研究所 | Double side pumping all solidified Yb:YAG strip external cavity laser |
| CN101540470A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Laser |
-
2011
- 2011-06-14 CN CN2011101628508A patent/CN102244347B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3697888A (en) * | 1971-04-05 | 1972-10-10 | Bell Telephone Labor Inc | Evanescent wave coupling technique for beam shaping |
| US4945544A (en) * | 1988-03-29 | 1990-07-31 | Rohm Co., Ltd. | Diode laser pumped solid-state laser |
| US6526088B1 (en) * | 1998-01-06 | 2003-02-25 | Yong Cheng | Alignment-free solid laser apparatus |
| CN2620399Y (en) * | 2003-05-14 | 2004-06-09 | 中国科学院安徽光学精密机械研究所 | Double side pumping all solidified Yb:YAG strip external cavity laser |
| CN101540470A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Laser |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602391A (en) * | 2016-12-09 | 2017-04-26 | 中国人民解放军海军航空工程学院 | Slab laser module with wave-front distortion self-correction ability |
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| CN102244347B (en) | 2012-11-14 |
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