CN101090194A - Laser resonant cavity of preventing mismatching - Google Patents
Laser resonant cavity of preventing mismatching Download PDFInfo
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- CN101090194A CN101090194A CN 200610087133 CN200610087133A CN101090194A CN 101090194 A CN101090194 A CN 101090194A CN 200610087133 CN200610087133 CN 200610087133 CN 200610087133 A CN200610087133 A CN 200610087133A CN 101090194 A CN101090194 A CN 101090194A
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Abstract
This invention discloses an anti-detuning laser resonator with high optical beam quality including an output mirror and a rear mirror set oppositely in co-axis, said rear mirror is in the shape of right angle taper of 90deg. This invention is helpful to realize output of laser of high beam quality having the advantages of anti-detuning, easy tuning, no hard edge difraction loss and high emission rate.
Description
Technical field
The present invention relates to the solid state laser technology, particularly a kind of laserresonator of preventing mismatching high light beam quality.
Background technology
In many laser applications, not only require laser to have beam quality preferably, more require laser that stronger preventing mismatching ability is arranged, and, wish that also the design of laser itself has advantages such as easy to assembly, that debugging is simple in order to satisfy large batch of production requirement.
In the prior art, the extensive method that adopts of preventing mismatching ability that strengthens laser is to adopt the back reflection chamber mirror of prism of corner cube as resonant cavity, as disclosed technology in document 1: Ye Yidong etc. " characteristics of cube-corner prism laser resonator; light laser and ion beam; the 16th the 8th phase of volume, in August, 2004 ".The preventing mismatching ability is strong, easy to assembly, debugging advantage such as simple though prism of corner cube has as back reflection chamber mirror, because that prism of corner cube has three right angles is stupefied, so can cause the outgoing hot spot to be divided into six lobes of obvious symmetry as the Effect of Back-Cavity Mirror reflex time; And because the stupefied hard-edge diffraction loss in right angle also causes out the reduction of light energy; In addition, this method is also very high to the requirement on machining accuracy of prism of corner cube, generally requires its angle of reflection precision will be in 3 seconds, and these all make its application be very restricted.Fig. 1 represents the schematic diagram of prism of corner cube as back reflection chamber mirror, and in the ideal case, 3 interior reflective surfaces of prism of corner cube are orthogonal among the figure, and the incident ray in effective incidence angle can strictly reflect back by the rightabout that is parallel to incident ray.The reflection ray of prism of corner cube and incident ray have certain translation on the position, both are about center, the summit symmetry of prism.Φ represents the logical light diameter of prism of corner cube among the figure, and h represents the height of prism of corner cube, and just the summit is to the vertical range of logical light bottom surface.
Because cirrhosis diffraction loss is preferably easily debugged, do not had to the deficiencies in the prior art with regard to needing a kind of laserresonator of improved preventing mismatching high light beam quality.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the laserresonator of a kind of preventing mismatching, easily debugging, no hard-edge diffraction loss, high light beam quality that light extraction efficiency is high is provided.
In order to achieve the above object, the present invention takes following technical scheme.
A kind of laserresonator of preventing mismatching comprises the common optical axis setting in opposite directions of outgoing mirror and Effect of Back-Cavity Mirror, it is characterized in that, described Effect of Back-Cavity Mirror is the right angle taper shape, and the cone angle of this circular cone is 90 °.
Further, the conical Effect of Back-Cavity Mirror in described right angle is the side polishing.
Further, there is the anti-reflection film corresponding with optical maser wavelength described circular cone bottom surface.
Further, described circular cone bottom surface is vertical with described optical axis.
Laserresonator employing cone angle of the present invention is 90 ° the conical Effect of Back-Cavity Mirror in right angle, goes into to inject the light of this right angle circular cone arbitrarily, all can strictly reflect back by the rightabout that is parallel to incident ray.So just realize the calm certainly of light, exempt from debugging.
Compared with prior art, the invention has the advantages that:
1) as shown in Figure 2, the incident ray in effective incidence angle can strictly reflect back by the rightabout that is parallel to incident ray.The reflection ray of circular cone prism and incident ray have certain translation on the position, both are about center, the summit symmetry of prism.Φ represents the logical light diameter of circular cone prism among the figure, and h represents the height of circular cone prism, and just the summit is to the vertical range of logical light bottom surface; Because be 90 degree right angle circular cones, so can realize upper and lower, left and right inverted image, this helps to realize the laser output of high light beam quality for the laser pump cavity of inhomogeneous pumping.Among Fig. 2 as signal, illustrate incident light " on " word, form upper and lower a, left side and right inverted image at the light of reflected back.
2) because the right angle circular cone has only a summit, the image angle cone prism does not have three right angle ribs, thereby its diffraction loss is significantly reduced.And can not be divided into six lobes by image angle cone prism shoot laser yet.Therefore laserresonator of the present invention has preventing mismatching, easily debugging, no hard-edge diffraction loss, advantage that light extraction efficiency is high.
Description of drawings
Fig. 1 represents the prism of corner cube structural representation of prior art Effect of Back-Cavity Mirror;
Fig. 2 represents the circular cone prism structural representation of the Effect of Back-Cavity Mirror of resonant cavity of the present invention;
Fig. 3 represents that the circular cone prism realization light of resonant cavity of the present invention is from calm reflection schematic diagram;
Fig. 4 represents the device schematic diagram of embodiment 1.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Make the laserresonator of preventing mismatching high light beam quality of the present invention with reference to Fig. 4, comprise that outgoing mirror 1 and right angle circular cone 4 are coaxial in opposite directions to be arranged on the optical axis.Adopt prior art that laser crystal bar 2 and accent Q unit 3 are set on the optical axis in this laserresonator.Wherein, outgoing mirror 1 and right angle circular cone 4 are installed on the whole mirror holder of a two-dimensional adjustable, and this mirror holder is the mirror holder of prior art, such as buying from the market.Laser bar 2 in the present embodiment is selected conventional Nd:YAG crystal for use, doping content 1%, and two end surfaces of laser bar crystal all are coated with the anti-reflection film that wavelength is 1064nm, and coating technique is well known to those skilled in the art; Transfer Q unit 3 can select electric-optically Q-switched unit for use, also can select the acousto-optic Q modulation unit for use, or passive Q-adjusted unit.The material of right angle conscope 4 adopts K9 glass, also can select the glass or the fused quartz of other trades mark for use, adopts K9 glass in the present embodiment.Right angle conscope 4 as the resonant cavity Effect of Back-Cavity Mirror, make its bottom surface vertical during installation with optical axis in the resonant cavity, polish the side of right angle conscope 4, the cone angle of this circular cone is 90 °, its bottom surface diameter generally is greater than or equals the diameter of laser crystal bar 2, because be that the right angle is conical, the bottom surface diameter is in case definite, highly also just definite.And the circular cone bottom surface of right angle conscope 4 is coated with the anti-reflection film of used optical maser wavelength, and the optical maser wavelength in the present embodiment is elected 1064nm as, so anti-reflection film is anti-reflection to the light of wavelength 1064nm.Outgoing mirror 1 adopts the speculum of part coupling output, and transmitance chooses 90% in the present embodiment, and it is K9 glass that material adopts, and also can select the glass or the fused quartz of other trades mark for use, and the diameter of outgoing mirror 1 is more than or equal to the diameter of laser crystal bar 2.
As shown in Figure 2, the incident ray in effective incidence angle can strictly reflect back by the rightabout that is parallel to incident ray.The reflection ray of circular cone prism and incident ray have certain translation on the position, both are about center, the summit symmetry of prism.Φ represents the logical light diameter of circular cone prism among the figure, and h represents the height of circular cone prism, and just the summit is to the vertical range of logical light bottom surface; Because be 90 degree right angle circular cones, so can realize upper and lower, left and right inverted image, this helps to realize the laser output of high light beam quality for the laser pump cavity of inhomogeneous pump mode.Among Fig. 2 as signal, illustrate incident light " on " word, form upper and lower a, left side and right inverted image at the light of reflected back, because total order of reflection is an even number, so thing is similar with picture, because optical axis x ' and x are reverse, so y ' and y are inevitable reverse; Be the right angle circular cone because of what play reflex again, so y and z are rotational symmetric, just y and z are equivalents, so y ' also becomes mirror image with z '.
Because the reflecting surface of right angle circular cone is a taper seat, so there is not hard-edge diffraction loss.As shown in Figure 3, solid line represents to become with optical axis the signal direction of advancing of the incident ray and the reflection ray of any angle among the figure; Article one, dotted line is represented the signal direction of advancing of incident ray parallel with optical axis and reflection ray; As seen, and though light be with optical axis incident abreast or with optical axis incident at an angle, reflection ray is all parallel with incident ray oppositely.Those skilled in the art know, obtain through how much derivations, the right angle circular cone can be realized the reflected in parallel of incident light, thereby this assembling that has not only solved laser is from calm, preventing mismatching but also can reduce laser the even distribution in gain media requires to improve beam quality to pump light.Because the existence still of conical tip diffraction loss, the existence of laser beam center bright spot is avoided may damaging of laser crystal, thereby is improved machine life in the time of can reducing the pulse laser work that especially gains higher.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1, a kind of laserresonator of preventing mismatching comprises the common optical axis setting in opposite directions of outgoing mirror and Effect of Back-Cavity Mirror, it is characterized in that, described Effect of Back-Cavity Mirror is the right angle taper shape, and the cone angle of this circular cone is 90 °.
According to the laserresonator of the described preventing mismatching of claim 1, it is characterized in that 2, the conical Effect of Back-Cavity Mirror in described right angle is the side polishing.
According to the laserresonator of claim 1 or 2 described preventing mismatchings, it is characterized in that 3, there is the anti-reflection film corresponding with optical maser wavelength described circular cone bottom surface.
According to the laserresonator of claim 1 or 2 described preventing mismatchings, it is characterized in that 4, described circular cone bottom surface is vertical with described optical axis.
According to the laserresonator of the described preventing mismatching of claim 3, it is characterized in that 5, described circular cone bottom surface is vertical with described optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610087133 CN101090194A (en) | 2006-06-13 | 2006-06-13 | Laser resonant cavity of preventing mismatching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610087133 CN101090194A (en) | 2006-06-13 | 2006-06-13 | Laser resonant cavity of preventing mismatching |
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| CN101090194A true CN101090194A (en) | 2007-12-19 |
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| CN 200610087133 Pending CN101090194A (en) | 2006-06-13 | 2006-06-13 | Laser resonant cavity of preventing mismatching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887696A (en) * | 2014-03-21 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Laser outputting tangential polarized beam |
-
2006
- 2006-06-13 CN CN 200610087133 patent/CN101090194A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887696A (en) * | 2014-03-21 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Laser outputting tangential polarized beam |
| CN103887696B (en) * | 2014-03-21 | 2016-09-21 | 中国科学院上海光学精密机械研究所 | Export the laser instrument of tangential polarized beam |
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Open date: 20071219 |