CN102487177A - Electro-optical crystal, laser resonant cavity and laser - Google Patents
Electro-optical crystal, laser resonant cavity and laser Download PDFInfo
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- CN102487177A CN102487177A CN2010106168135A CN201010616813A CN102487177A CN 102487177 A CN102487177 A CN 102487177A CN 2010106168135 A CN2010106168135 A CN 2010106168135A CN 201010616813 A CN201010616813 A CN 201010616813A CN 102487177 A CN102487177 A CN 102487177A
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Abstract
The invention provides an electro-optical crystal, a laser resonant cavity and a laser. The laser comprises a pump light source, a laser resonant cavity and a laser crystal that is installed in the laser resonant cavity. A first cavity mirror, a folded cavity mirror and an electro-optical crystal are successively arranged in the laser resonant cavity. And one end of the electro-optical crystal is provided with a high reflection plane, wherein the one end of the electro-optical crystal is far from the folded cavity mirror; besides, the high reflection plane is perpendicular to an optical axis of the electro-optical crystal as well as is used as a second cavity mirror of the laser resonant cavity. The laser resonant cavity of the laser has advantages of simple structure and miniaturization.
Description
[technical field]
The present invention relates to laser, particularly a kind of laser resonant cavity simultaneously, the invention still further relates to the electrooptic crystal that is applied to said laser resonant cavity.
[background technology]
In recent years, along with the laser of industrial process applications is continually developed, simple basic frequency laser device can not satisfy the application of miscellaneous materials processing far away.Along with the successful development of green glow and ultraviolet laser, there have been corresponding laser cutting, laser marking and other laser retrofit equipment to come out one after another gradually.
In existing laser, usually with electrooptic crystal as in the resonant cavity, and make the reflecting surface of reflecting cavity mirror of optical axis and resonant cavity of electrooptic crystal perpendicular.Debugging is during electro-optical Q-switching laser, and not adding earlier electrooptic crystal usually, to regulate two reflectings surface of two reflecting cavity mirrors parallel to each other, obtains continuous laser output, and the oscillating laser of this moment is perpendicular to two chamber mirrors.Add electrooptic crystal then, the position of adjustment electrooptic crystal makes its optical axis overlap fully with oscillation light, also is that optical axis is perpendicular to chamber mirroring face.And in actual mechanical process; Be difficult to be adjusted to the optical axis of electrooptic crystal strict vertical with chamber mirroring face; This phase difference and pi/2 that will cause electrooptic crystal to produce has certain deviation, makes Q impulse rising edge or trailing edge little secondary peak occur, thereby influences the output performance of laser.
[summary of the invention]
The technical problem that the present invention solves provides a kind of simple in structure, the laser resonant cavity that microminiaturization and optical axis are easy to regulate.
The present invention for the technical scheme that the technical solution problem adopts is:
A kind of laser resonant cavity is provided; Comprise: the first chamber mirror, refrative cavity mirror and the electrooptic crystal that are provided with in regular turn; It is characterized in that: said electrooptic crystal is set to high reflecting surface away from an end of refrative cavity mirror; And said high reflecting surface is perpendicular to the optical axis of said electrooptic crystal, and said high reflecting surface is as the second chamber mirror of said laser resonant cavity.
Further, the other end of said electrooptic crystal is provided with anti-reflection film.
Further, the cavity dumping Q-switch laser way of output is adopted in laser output.
Further, the electric-optically Q-switched employing pressurization bright dipping mode of said electrooptic crystal.
Further, the light mode that extrudes is moved back in the electric-optically Q-switched employing of said electrooptic crystal.
Further, said laser resonant cavity adopts the end pumping mode.
Further, said laser resonant cavity adopts the profile pump mode.
Further, the high reflecting surface of said electrooptic crystal forms for electroplating.
Further, the high reflecting surface of said electrooptic crystal forms for attaching high-reflecting film.
Further, said polarizer is the Brewster mirror.
The present invention provides a kind of electrooptic crystal that is applied in the laser resonant cavity simultaneously, and said electrooptic crystal one end face is high reflecting surface, and said high reflecting surface is perpendicular to the optical axis of said electrooptic crystal, and said high reflecting surface is as one of reflecting cavity mirror of laser resonant cavity.
The present invention provides a kind of laser simultaneously; It comprises pump light source, laser resonant cavity and is installed on the laser crystal in the laser resonant cavity; Be sequentially provided with the first chamber mirror, refrative cavity mirror and electrooptic crystal in the said laser resonant cavity; It is characterized in that: said electrooptic crystal is set to high reflecting surface away from an end of refrative cavity mirror, and said high reflecting surface is perpendicular to the optical axis of said electrooptic crystal, and said high reflecting surface is as the second chamber mirror of said laser resonant cavity.
Compared to prior art, the present invention plates highly reflecting films with the end of the electrooptic crystal of laser resonant cavity, as a reflecting cavity mirror of laser resonant cavity; Electrooptic crystal and resonator mirror are united two into one, thereby can omit a reflecting cavity mirror, simplify the structure of laser resonant cavity; And finally simplify the structure of laser; And be easy to regulate optical axis, volume is little, helps the microminiaturization development of laser.
[description of drawings]
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 has shown the structural representation of using the laser of one embodiment of the present invention;
Fig. 2 has shown the structural representation of using the laser of another preferred embodiment of the present invention;
Fig. 3 has shown the structural representation of using the laser of another preferred embodiment of the present invention;
Fig. 4 has shown the structural representation of using the laser of another preferred embodiment of the present invention.
[embodiment]
The invention provides a kind of laser; In said laser, plate the oscillation light anti-reflection film through a end with electrooptic crystal; The structure of other end plating oscillation light high-reflecting film; Guarantee the vertical of optical axis of crystal resonant cavity reflecting surface from processing technology, promptly be parallel to the direction of propagation of oscillation light, be convenient to the adjusting of electrooptic crystal more.
Fig. 1 has shown the structural representation of laser 100 according to one preferred embodiment of the present invention.In the present embodiment, be that example is introduced in detail with more general end-face pump solid laser.
Said laser 100 mainly comprises pump light source, laser resonant cavity (not indicating) and is installed on the laser crystal 2 in the laser resonant cavity.Said laser resonant cavity is used to provide bulk of optical feedback; The stimulated radiation photon is is repeatedly come and gone in said resonant cavity to form relevant persistent oscillation; And direction and the frequency that comes and goes the vibration light beam in the chamber limited, to guarantee to export laser with certain directionality and monochromaticjty.Wherein said laser resonant cavity comprises total reflective mirror 1, refrative cavity mirror 3 and electrooptic crystal 4.
Said electrooptic crystal 4 is used for regulating the Q value.Under the end pumping mode, said total reflective mirror 1 need be coated with the anti-reflection and oscillation light highly reflecting films layer to pump light.Under the profile pump mode, said total reflective mirror 1 is coated with oscillation light highly reflecting films layer.
Said refrative cavity mirror 3 adopts the Brewster mirror, and the angle of placement need reach the requirement of the S polarised light total reflection that makes incident: promptly satisfy oscillation light and minute surface and be 90 °-θ
BCondition, the angle between reflection ray and the incident ray is 2 θ
B, and all be the S polarised light.θ wherein
BBe Brewster's angle.The Brewster mirror can play partially simultaneously, the effect of analyzing, reflection and outgoing mirror, can obtain good electric-optically Q-switched effect, can be used for the electric-optically Q-switched solid state laser of cavity dumping and the electrooptic crystal of all profile pump modes, end pumping mode.
Said electrooptic crystal 4 is coated with oscillation light anti-reflection film 41 near an end of said refrative cavity mirror 3; The other end then is coated with oscillation light highly reflecting films 42; Form high reflecting surface, wherein said highly reflecting films 42 effects are equivalent to another total reflective mirror of laser resonant cavity, and constitute resonant cavity with said total reflective mirror 1.And the reflecting surface of the optical axis of crystal of said electrooptic crystal 4 and said highly reflecting films 42 is vertical, promptly is parallel to the direction of propagation of oscillation light, so that the adjusting of said electrooptic crystal 4.Said highly reflecting films 42 are for plating or pad pasting forms and the end face of said electrooptic crystal 4.Said total reflective mirror 1 and said highly reflecting films 42 can be described as the first chamber mirror, the second chamber mirror of said resonant cavity, general name chamber mirror respectively.
The concrete electric-optically Q-switched process of said laser 100 is: for pressurization bright dipping mode; Under the pumping effect; Axial ray 6 by laser crystal 2 produces and said total reflective mirror 1 reflects is satisfying under the condition of Brewster's angle; After refrative cavity mirror 3 reflections via Brewster mirror formation, rising partially is S polarised light 7, is V through overvoltage
λ/4Behind the electrooptic crystal 4 of (λ is an optical maser wavelength), phase shifts pi/2, become circularly polarized light, by 42 reflections of said highly reflecting films, be V through overvoltage again
λ/4Said electrooptic crystal 4 time, total phase shifts is π, becomes the P polarization by the S polarization, becomes the refrative cavity mirror 3 that is made up of the Brewster mirror and transmits the P polarization light 8 outside the chamber.At this moment, big transmission loss makes in the chamber can not form laser generation, and laserresonator is in the low reactance-resistance ratio state.Under the pumping effect, the inverted population in the laser crystal 2 constantly accumulates; When the voltage on the said electrooptic crystal 4 moves back when being 0; Vibration is amplified in the resonant cavity that light 6 and S polarised light 7 can constitute at the highly reflecting films 42 of total reflective mirror 1 and said electrooptic crystal 4; Obtain gain, laserresonator is in high Q state of value, and light intensity constantly increases in the resonant cavity; Again the voltage on the said electrooptic crystal 4 is upgraded to V
λ/4, light 7 becomes the P polarization in the resonant cavity, can all be transmitted by the refrative cavity mirror 3 that the Brewster mirror constitutes outside the chamber, forms the laser Q pulse of high-peak power, narrow pulse width, light path shown in light 8.
The electric-optically Q-switched laser resonator of said structure is an adding pressure type.
In addition, according to another embodiment of the present invention, set up λ/4 wave plates between refrative cavity mirror 3 and the electrooptic crystal 4 at laser 200 as shown in Figure 2 and then become and move back the folding cavity-dumping electro-optic Q-switch laser resonant cavity of pressure type.Said laserresonator comprises total reflective mirror 1, refrative cavity mirror 3, electrooptic crystal 4 and λ/4 wave plates 9.
It should be noted that to convenient and describe that the element of same or similar function has adopted identical numbering among Fig. 1～Fig. 2, has only adopted new numbering at the different elements place, to show difference.
Under the end pumping mode, said total reflective mirror 1 need be coated with the anti-reflection and oscillation light highly reflecting films layer to pump light.Under the profile pump mode, said total reflective mirror 1 is coated with oscillation light highly reflecting films layer.
Said refrative cavity mirror 3 adopts the Brewster mirror, and the angle of placement need reach the requirement of the S polarised light total reflection that makes incident: promptly satisfy oscillation light and minute surface and be 90 °-θ
BCondition, the angle between reflection ray and the incident ray is 2 θ
B, and all be the S polarised light.θ wherein
BBe Brewster's angle.
The concrete electric-optically Q-switched process of said laser 100 is: extrude the light mode for moving back, under the pumping effect, satisfied under the condition of Brewster's angle by the axial ray 6 that laser crystal 2 produces and said total reflective mirror 1 reflects; After refrative cavity mirror 3 reflections that constitute via the Brewster mirror, rising partially is S polarised light 7, is behind 0 the electrooptic crystal 4 and λ/4 wave plates 9 through overvoltage; Phase shifts pi/2, become circularly polarized light, by 42 reflections of said highly reflecting films; Again when overvoltage is 0 said electrooptic crystal 4 and λ/4 wave plates 9; Total phase shifts is π, becomes the P polarization by the S polarization, becomes the refrative cavity mirror 3 that is made up of the Brewster mirror and transmits the P polarization light 8 outside the chamber.At this moment, big transmission loss makes in the chamber can not form laser generation, and laserresonator is in the low reactance-resistance ratio state.Under the pumping effect, the inverted population in the said laser crystal 2 constantly accumulates; Voltage on said electrooptic crystal 4 moves back and is upgraded to V
λ/4The time, vibration is amplified in the resonant cavity that light 6 and S polarization state light 7 can constitute at the highly reflecting films 42 of total reflective mirror 1 and said electrooptic crystal 4, the acquisition gain, and laserresonator is in high Q state of value, and light intensity constantly increases in the resonant cavity; The voltage on the said electrooptic crystal 4 being moved back is 0 again, and light 7 becomes the P polarization in the resonant cavity, can all be transmitted by the refrative cavity mirror 3 that the Brewster mirror constitutes outside the chamber, forms the laser Q pulse of high-peak power, narrow pulse width, light path shown in light 8.
Fig. 3 has shown application another preferred embodiment of the present invention.In Fig. 3, be said LD light-pumped solid state laser 300, mainly comprise laser resonant cavity (not indicating), place laser crystal 32 and pump light source (figure does not show) in the laser resonant cavity.Said laser resonant cavity is used to provide bulk of optical feedback; The stimulated radiation photon is is repeatedly come and gone in said resonant cavity to form relevant persistent oscillation; And direction and the frequency that comes and goes the vibration light beam in the chamber limited, to guarantee to export laser with certain directionality and monochromaticjty.Wherein said laser resonant cavity comprises total reflective mirror 31, fundamental frequency light turning mirror 34, polarization spectroscope 35, electrooptic crystal 36.
Said fundamental frequency light turning mirror 34 is arranged on the corner of said total reflective mirror 31 and polarization spectroscope 35, thereby forms L type resonant cavity.Said laser crystal 32 is arranged between said total reflective mirror 31 and the said fundamental frequency light turning mirror 34, and said polarization spectroscope 35 is arranged between said fundamental frequency light turning mirror 34 and the said electrooptic crystal 36.
Said electrooptic crystal 36 is near the end plating oscillation light anti-reflection film 361 of said polarization spectroscope 35, and the other end then plates oscillation light highly reflecting films 362.Wherein saidly shoot high another total reflective mirror that 362 effects of anti-film are equivalent to laser resonant cavity, and constitute resonant cavitys with said total reflective mirror 31.And the optical axis of crystal of said electrooptic crystal 36 is vertical with the reflecting surface of said highly reflecting films 362, promptly is parallel to the direction of propagation of oscillation light, so that the adjusting of said electrooptic crystal 36.General said refrative cavity mirror can comprise fundamental frequency light turning mirror 34 and polarization spectroscope 35.
Fig. 4 has shown the laser structure sketch map of using the other preferred embodiment of the present invention.The structural similarity of said laser 400 and LD light-pumped solid state laser 300 shown in Figure 3, its main distinction is: between said polarization spectroscope 35 and said electrooptic crystal 36, quarter-wave plate 37 is set further.Its characteristics remain: said electrooptic crystal 36 is near the end plating oscillation light anti-reflection film 361 of said quarter-wave plate 37; The other end then plates oscillation light highly reflecting films 362; Wherein saidly shoot high another total reflective mirror that 362 effects of anti-film are equivalent to laser resonant cavity, and constitute resonant cavitys with said total reflective mirror 31.And the optical axis of crystal of said electrooptic crystal 36 is vertical with the reflecting surface of said highly reflecting films 362, promptly is parallel to the direction of propagation of oscillation light, so that the adjusting of said electrooptic crystal 36.
In sum; Of the present invention focusing on plates highly reflecting films with the end of electrooptic crystal, electrooptic crystal and refrative cavity mirror united two into one, thereby can omit a reflecting cavity mirror; Simplify the structure of resonant cavity; And finally simplify the structure of laser, and dwindle its volume, help the microminiaturization development of laser.
Certainly the present invention is not limited only to be applied in the listed laser of the foregoing description, can also be applied to the resonant cavity of general linear laser resonant cavity or other folded form resonance-cavity laser.
In the above-described embodiments, only the present invention has been carried out exemplary description, but those skilled in the art can carry out various modifications to the present invention after reading present patent application under the situation that does not break away from the spirit and scope of the present invention.
Claims (10)
1. laser resonant cavity; Comprise: the first chamber mirror, refrative cavity mirror and the electrooptic crystal that are provided with in regular turn; It is characterized in that: said electrooptic crystal is set to high reflecting surface away from an end of refrative cavity mirror; And said high reflecting surface is perpendicular to the optical axis of said electrooptic crystal, and said high reflecting surface is as the second chamber mirror of said laser resonant cavity.
2. laser resonant cavity as claimed in claim 1 is characterized in that: the other end of said electrooptic crystal is provided with anti-reflection film.
3. laser resonant cavity as claimed in claim 1 is characterized in that: the cavity dumping Q-switch laser way of output is adopted in laser output.
4. laser resonant cavity as claimed in claim 3 is characterized in that: the electric-optically Q-switched employing pressurization bright dipping mode of said electrooptic crystal.
5. laser resonant cavity as claimed in claim 3 is characterized in that: the light mode that extrudes is moved back in the electric-optically Q-switched employing of said electrooptic crystal.
6. laser resonant cavity as claimed in claim 1 is characterized in that: the high reflecting surface of said electrooptic crystal forms for electroplating.
7. laser resonant cavity as claimed in claim 1 is characterized in that: the high reflecting surface of said electrooptic crystal forms for attaching highly reflecting films.
8. laser resonant cavity as claimed in claim 1 is characterized in that: said refrative cavity mirror is the Brewster mirror.
9. electrooptic crystal that is applied in the laser resonant cavity, it is characterized in that: said electrooptic crystal one end face is high reflecting surface, and said high reflecting surface is perpendicular to the optical axis of said electrooptic crystal, and said high reflecting surface is as one of chamber mirror of laser resonant cavity.
10. laser; Comprise pump light source, laser resonant cavity and be installed on the laser crystal in the laser resonant cavity; Said laser resonant cavity is sequentially provided with the first chamber mirror, refrative cavity mirror and electrooptic crystal; It is characterized in that: said electrooptic crystal is set to high reflecting surface away from an end of refrative cavity mirror, and said high reflecting surface is perpendicular to the optical axis of said electrooptic crystal, and said high reflecting surface is as the second chamber mirror of said laser resonant cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106168135A CN102487177A (en) | 2010-12-31 | 2010-12-31 | Electro-optical crystal, laser resonant cavity and laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106168135A CN102487177A (en) | 2010-12-31 | 2010-12-31 | Electro-optical crystal, laser resonant cavity and laser |
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| CN102487177A true CN102487177A (en) | 2012-06-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900032A (en) * | 2017-11-20 | 2018-04-13 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of picosecond laser cleaning device |
| CN114256725A (en) * | 2021-12-23 | 2022-03-29 | 湖北久之洋信息科技有限公司 | External cavity feedback type all-fiber cavity emptying laser |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304150A (en) * | 2008-07-02 | 2008-11-12 | 福州高意通讯有限公司 | Structure of micro-slice type electro-optical Q-switching laser |
| CN101834400A (en) * | 2010-04-09 | 2010-09-15 | 华中科技大学 | Folding cavity-dumping electro-optic Q-switch laser resonant cavity |
-
2010
- 2010-12-31 CN CN2010106168135A patent/CN102487177A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304150A (en) * | 2008-07-02 | 2008-11-12 | 福州高意通讯有限公司 | Structure of micro-slice type electro-optical Q-switching laser |
| CN101834400A (en) * | 2010-04-09 | 2010-09-15 | 华中科技大学 | Folding cavity-dumping electro-optic Q-switch laser resonant cavity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900032A (en) * | 2017-11-20 | 2018-04-13 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of picosecond laser cleaning device |
| CN107900032B (en) * | 2017-11-20 | 2019-10-01 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | A kind of picosecond laser cleaning device |
| CN114256725A (en) * | 2021-12-23 | 2022-03-29 | 湖北久之洋信息科技有限公司 | External cavity feedback type all-fiber cavity emptying laser |
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Application publication date: 20120606 |