CN102074885B - The polarizer and laser cavity structure in a kind of laser cavity - Google Patents
The polarizer and laser cavity structure in a kind of laser cavity Download PDFInfo
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- CN102074885B CN102074885B CN201010611060.9A CN201010611060A CN102074885B CN 102074885 B CN102074885 B CN 102074885B CN 201010611060 A CN201010611060 A CN 201010611060A CN 102074885 B CN102074885 B CN 102074885B
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Abstract
The present invention relates to laser field, relate in particular to the polarizer in a kind of laser cavity. the invention discloses the polarizer and laser cavity structure in a kind of laser cavity, it utilizes the Walk-off crystal of generally making as the poor birefringece crystal of the uniformity of waste product, due to its inhomogeneity deviation, make away the e light that separates out no longer parallel at outgoing end face with o light, but there is certain angle theta, setting it as the polarizer is applied in laserresonator, utilize the deviation introducing loss of e light that e light loss is consumed, and o light is perpendicular to the lossless laser starting of oscillation of resonator, or make e light perpendicular to the lossless laser starting of oscillation of resonator, form the laser generation of single polarization, play and in laser cavity, play inclined to one side effect. in a kind of laser cavity of the present invention, the polarizer has the advantages such as volume is little, laser loss is little, spectral region is wide, be easy to produce in enormous quantities, cost is lower, can be applicable to microchip or separates in the multiple laser cavity structures such as cavate.
Description
Technical field
The present invention relates to laser field, relate in particular to the polarizer and laser cavity structure in a kind of laser cavity.
Background technology
In laser field, tend to need a kind of polarizing component to carry out polarization selection to the eigen mode in laser instrument, improve lasing efficiency to reach, obtain the objects such as High Extinction Ratio Laser output. Traditional is in laser cavity, to add the various polarization selectors such as Brewster sheet, polarization absorption sheet to be polarized. But these elements of often coming in and going out can significantly increase the loss of laser instrument, or size is larger, is difficult to be integrated in micro-slice laser. Application number is the Chinese invention patent of CN200910165033.0, discloses a kind of for playing the inclined to one side absorption-type polarizer in chamber. In this patent, utilize polarizer and the partial polarization device of the absorption inconsistent formation of two polarization directions of aeolotropic crystal of adulterating in part spectral region. It tends to significantly increase the loss of laser instrument, and its spectral region is little, need to utilize different aeolotropic crystals to realize rising partially of different spectral bands.
Summary of the invention
For overcoming the problems referred to above, the present invention proposes the polarizer and corresponding laser cavity structure in a kind of laser cavity.
For achieving the above object, technical scheme provided by the invention is: the polarizer in a kind of laser cavity, comprise a birefringece crystal, it is characterized in that: described birefringece crystal is the poor Walk-off crystal of uniformity, as other the birefringece crystal such as YVO4 birefringece crystal or a-BBO. There is certain angle in e light and o light that the outgoing end face of described Walk-off crystal is propagated, e in this crystal when serious, and the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ".
Further, described Walk-off crystal polarizer can form a kind of half-separation type laser cavity structure with an even gain medium and a back cavity eyeglass. The front end face plating laser front cavity mirror film of described gain medium, the front end face plating laser Effect of Back-Cavity Mirror film of described back cavity eyeglass, the two forms laserresonator.
Further, described Walk-off crystal polarizer also can form a kind of micro-piece type laser cavity structure with an even gain medium. The front end face plating laser front cavity mirror film of described gain medium, the rear end face plating laser Effect of Back-Cavity Mirror film of described Walk-off crystal polarizer, the two forms laserresonator.
Further, can in above-mentioned micro-piece type laser cavity structure, insert other the nonlinear crystalline material such as a passive Q-adjusted crystal or frequency-doubling crystal, as Cr:YAG, just can obtain like this adjusting Q pulse laser output of high polarization ratio.
Further, described Walk-off crystal polarizer also can form the vertical Austria of a kind of lyot(with a birefringece crystal and an even gain medium) wave filter laser cavity structure. In the middle of birefringece crystal described in described gain medium is clipped in and described Walk-off crystal polarizer; The front end face plating laser front cavity mirror film of described birefringece crystal, the rear end face plating laser Effect of Back-Cavity Mirror film of described Walk-off crystal polarizer; Described birefringece crystal, as ktp crystal, forms lyot wave filter laserresonator with described Walk-off crystal polarizer, forms the vertical film of choosing and play dual parts inclined to one side in laser cavity.
Further, gain medium recited above is conventional as Nd:YAG; In above-mentioned all laser cavity structures, can utilize the deviation introducing loss of e light that e light loss is consumed, and o light is lossless in laser starting of oscillation perpendicular to resonator, forms the laser generation of single polarization, plays and in laser cavity, plays inclined to one side effect; Also can, at Walk-off light splitting end, make Effect of Back-Cavity Mirror vertical with e light, the angle that now normal of o light and chamber mirror forms a non-zero be depleted in laser cavity, thus the polarizing of e light swing, form the laser generation of single polarization, play and in laser cavity, play inclined to one side effect.
In a kind of laser cavity of the present invention, the polarizer has the advantages such as volume is little, laser loss is little, spectral region is wide, be easy to produce in enormous quantities, cost is lower, can be applicable to microchip or separates in the multiple laser cavity structures such as cavate.
Brief description of the drawings
Fig. 1 is a kind of half-separation type laser cavity structure schematic diagram, and wherein the polarizing of o light is swung, and forms single polarization laser vibration;
Fig. 2 is a kind of half-separation type laser cavity structure schematic diagram, and wherein the polarizing of e light is swung, and forms single polarization laser vibration;
Fig. 3 is a kind of micro-piece type laser cavity structure schematic diagram, and wherein the polarizing of o light is swung, and forms single polarization laser vibration;
Fig. 4 is a kind of micro-piece type laser cavity structure schematic diagram, and wherein the polarizing of e light is swung, and forms single polarization laser vibration;
Fig. 5 is a kind of microchip passively Q switched laser cavity configuration schematic diagram, and wherein the polarizing of o light is swung, and forms single polarization laser vibration;
Fig. 6 is a kind of microchip passively Q switched laser cavity configuration schematic diagram, and wherein the polarizing of e light is swung, and forms single polarization laser vibration;
Fig. 7 is that a kind of lyot(is vertical difficult to understand) wave filter laser cavity structure schematic diagram, wherein the polarizing of o light is swung, and forms single polarization laser vibration;
Fig. 8 is that a kind of lyot(is vertical difficult to understand) wave filter laser cavity structure schematic diagram, wherein the polarizing of e light is swung, and forms single polarization laser vibration.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described further to explanation.
Technical scheme provided by the invention is: the polarizer in a kind of laser cavity, comprise a birefringece crystal, it is characterized in that: described birefringece crystal is the poor Walk-off crystal of uniformity, as other the birefringece crystal such as YVO4 birefringece crystal or a-BBO. There is certain angle in e light and o light that the outgoing end face of described Walk-off crystal is propagated, e in this crystal when serious, and the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ". Described Walk-off crystal is applied in the multiple laser cavity structure such as microchip or separate type.
Its general principle is: utilize the poor birefringece crystal of uniformity to make Walk-off crystal, due to its inhomogeneity deviation, make away the e light that separates out no longer parallel at outgoing end face with o light, but have certain angle theta. For example YVO4 birefringece crystal is as Walk-off crystal, because optical direction is not heavy straight with crystal growth direction, therefore uniformity is poor, and usually the o light of outgoing and e light have certain angle, e in this crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ". Utilize this feature, this type of Walk-off crystal is incorporated in laserresonator, utilize the deviation introducing loss of e light that e light loss is consumed, and o light is perpendicular to the lossless laser starting of oscillation of resonator, form the laser generation of single polarization, play and in laser cavity, play inclined to one side effect. This kind of polarizer is particularly suitable for rising partially in the micro-slice laser in average chamber, also can be applied in other cavity structures, in disengagement chamber structure. In addition, also can adopt allow e light starting of oscillation o light loss rise inclined to one side effect, now we require at Walk-off light splitting end, chamber mirror should be vertical with e light, the angle that now o light just can form a non-zero with the normal of chamber mirror is depleted in laser cavity, thereby the polarizing of e light is swung, and forms the laser generation of single polarization, play and in laser cavity, play inclined to one side effect.
In a kind of laser cavity of the present invention, the polarizer has the advantages such as volume is little, laser loss is little, spectral region is wide, be easy to produce in enormous quantities, cost is lower, can be applicable to microchip or separates in the multiple laser cavity structures such as cavate, and detailed description of the invention is as follows.
Embodiment mono-: a kind of half-separation type laser cavity structure as shown in Figure 1, wherein 101 is laser instrument front cavity mirror film, 102 is non-birefringence (optical property is even) gain medium, as Nd:YAG, the 103 Walk-off polarizers of mentioning for the present invention, as other the Walk-off crystalloid such as YVO4 or a-BBO, 104 is laser instrument Effect of Back-Cavity Mirror film, and 105 is back cavity eyeglass. In laser cavity, o light 107 is vertical with Effect of Back-Cavity Mirror 104 forms and vibrates in laser cavity, e light 106 and the o light 107 of outgoing have a bias angle theta angle, e in this Walk-off crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ", its deviation and losing in laser cavity. In final laser cavity, only have the starting of oscillation of o light, reached inclined to one side effect.
In addition, also can make Effect of Back-Cavity Mirror 104 vertical with e light 106, as shown in Figure 2, so that e light 106 forms vibration in laser cavity, e light 106 and the o light 107 of outgoing have a bias angle theta angle, e in this Walk-off crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ", o light deviation and losing in laser cavity thus, only has the starting of oscillation of e light in final laser cavity, has reached inclined to one side effect.
Embodiment bis-: a kind of micro-piece type laser cavity structure as shown in Figure 3, on the basis of embodiment mono-, save back cavity eyeglass, directly Effect of Back-Cavity Mirror film 204 is plated on the polarizer 203, the front end face plating front cavity mirror film 201 of gain medium 202, wherein 202 is non-birefringence (optical property is even) gain medium, as Nd:YAG. In laser cavity, o light 206 is vertical with Effect of Back-Cavity Mirror film 204 forms and vibrates in laser cavity, e light 205 and the o light 206 of outgoing have a bias angle theta angle, e in this Walk-off crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ", its deviation and losing in laser cavity. In final laser cavity, only have the starting of oscillation of o light, reached inclined to one side effect.
In addition, also can make Effect of Back-Cavity Mirror 204 vertical with e light 205, as shown in Figure 4, so that e light 205 forms vibration in laser cavity, e light 205 has a bias angle theta angle with o light 206, e in this Walk-off crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ", o light deviation and losing in laser cavity thus, only has the starting of oscillation of e light in final laser cavity, has reached inclined to one side effect.
Further, as shown in Figure 5,6, can also in microchip structure, insert passive Q-adjusted crystal 207, as Cr:YAG, just can obtain like this adjusting Q pulse laser output of high polarization ratio. Or insert other the nonlinear crystalline material such as frequency-doubling crystal, to obtain double-frequency laser output.
Embodiment tri-: a kind of lyot(is as shown in Figure 7 vertical difficult to understand) wave filter laser cavity structure, by birefringece crystal 307, as ktp crystal, form the vertical Austria of lyot(with Walk-off crystal polarizer 303 of the present invention) wave filter, in laser cavity, form the vertical film of choosing and play dual parts inclined to one side. The wherein front end face of birefringece crystal 307 plating laser front cavity mirror film 301, the rear end face plating laser Effect of Back-Cavity Mirror film 304 of this polarizer 303, wherein 302 is gain medium, as Nd:YAG. Birefringece crystal 307 wherein also can play the effect of frequency multiplication or other nonlinear frequency transformation simultaneously. In laser cavity, o light 306 is vertical with Effect of Back-Cavity Mirror film 304 forms and vibrates in laser cavity, e light 305 and the o light of outgoing have a bias angle theta angle, e in this Walk-off crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ", its deviation and losing in laser cavity. In final laser cavity, only have the starting of oscillation of o light, reached inclined to one side effect.
In addition, also can make Effect of Back-Cavity Mirror 304 vertical with e light 305, as shown in Figure 8, so that e light 305 forms vibration in laser cavity, e light 305 and the o light 306 of outgoing have a bias angle theta angle, e in this Walk-off crystal when serious, the every propagation of o light 1cm just can produce the drift angle of 60 " 70 ", o light deviation and losing in laser cavity thus, only has the starting of oscillation of e light in final laser cavity, has reached inclined to one side effect.
Although specifically show and introduced this patent in conjunction with preferred embodiment; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (11)
1. the polarizer in a laser cavity, comprise a birefringece crystal, it is characterized in that: described birefringece crystal be uniformity poor and can make e light that this crystal outgoing end face propagates with the generation one of o light compared with the Walk-off crystal (103) of mitre, light beam deviation and losing in laser cavity in described e light and o light, another light beam, perpendicular to the lossless laser starting of oscillation of laser cavity, forms the laser generation of single polarization; Described Walk-off crystal (103) is for making the e in it, and the every propagation of o light 1cm just can produce the crystal of 60 ＂ drift angles, ＂-70, and described Walk-off crystal (103) is YVO4 or a-BBO crystal.
2. a half-separation type laser cavity structure, comprise an even gain medium (102), a polarizer (103) and a back cavity eyeglass (105), the front end face plating laser front cavity mirror film (101) of described gain medium, the front end face plating laser Effect of Back-Cavity Mirror film (104) of back cavity eyeglass, it is characterized in that: the described polarizer is the polarizer in laser cavity claimed in claim 1, between described gain medium and Effect of Back-Cavity Mirror.
3. a micro-piece type laser cavity structure, comprise an even gain medium (202) and a polarizer (203), the front end face plating laser front cavity mirror film (201) of described gain medium, it is characterized in that: the described polarizer (203) is the polarizer in laser cavity claimed in claim 1, the rear end face plating laser Effect of Back-Cavity Mirror film (204) of the described polarizer.
4. a kind of micro-piece type laser cavity structure as claimed in claim 3, is characterized in that: also comprise a nonlinear crystal (207); It is middle with Walk-off crystal polarizer (203) that described nonlinear crystal is clipped in described gain medium (202).
5. a kind of micro-piece type laser cavity structure as claimed in claim 4, is characterized in that: described nonlinear crystal (207) is passive Q-adjusted crystal or frequency-doubling crystal.
6. a lyot(is vertical difficult to understand) wave filter laser cavity structure, comprise a birefringece crystal (307), an even gain medium (302) and a polarizer (303), it is middle with the described polarizer (303) that described gain medium (302) is clipped in described birefringece crystal (307), the front end face plating laser front cavity mirror film (301) of described birefringece crystal, the rear end face plating laser Effect of Back-Cavity Mirror film (304) of the described polarizer, is characterized in that: the described polarizer is the polarizer in laser cavity claimed in claim 1; Described birefringece crystal (307) forms lyot wave filter laserresonator with described Walk-off crystal polarizer (303).
7. a kind of lyot wave filter laser cavity structure as claimed in claim 6, is characterized in that, described birefringece crystal (307) is nonlinear frequency transformation crystal.
8. a kind of lyot wave filter laser cavity structure as claimed in claim 7, is characterized in that: described nonlinear frequency transformation crystal is ktp crystal.
9. half-separation type laser cavity structure as claimed in claim 2, is characterized in that: described laser Effect of Back-Cavity Mirror is vertical with o light or vertical with e light; Described gain medium is Nd:YAG.
10. micro-piece type laser cavity structure as claimed in claim 3, is characterized in that: described laser Effect of Back-Cavity Mirror is vertical with o light or vertical with e light; Described gain medium is Nd:YAG.
11. lyot(as claimed in claim 6 are vertical difficult to understand) wave filter laser cavity structure, it is characterized in that: described laser Effect of Back-Cavity Mirror is vertical with o light or vertical with e light; Described gain medium is Nd:YAG.
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