CN201397438Y - Non-critical phase matching frequency doubler - Google Patents
Non-critical phase matching frequency doubler Download PDFInfo
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- CN201397438Y CN201397438Y CN2009201383462U CN200920138346U CN201397438Y CN 201397438 Y CN201397438 Y CN 201397438Y CN 2009201383462 U CN2009201383462 U CN 2009201383462U CN 200920138346 U CN200920138346 U CN 200920138346U CN 201397438 Y CN201397438 Y CN 201397438Y
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- phase matching
- light
- frequency
- noncritical phase
- crystal
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model relates to the field of lasers, in particular to the field of frequency doublers. A non-critical phase matching frequency doubler is characterized in that a base wave light reflection reducting coating layer is plated on an incident light path of a non-critical phase matching crystal, a frequency doubled light or/and a frequency light reflection reducting coating layer is platedon an emergent light path, and the other parts of the two sides of the crystal are provided with base wave light and frequency doubled light or/and frequency light reflection film layer used for reflecting light beams back and forth in a 'Z'-shape. The incident angle of light entering into the non-critical phase matching crystal at the emergent light path is the receiving range of a non-critical phase matching angle of the non-critical phase matching crystal. The doubler adopts the technical solution, has smaller volume compared with an original frequency doubler, and has the advantages of simple and reasonable structure, and can be widely applied in the fields which need the laser frequency doubling.
Description
Technical field
The utility model relates to laser field, relates in particular to field of frequency multipliers.
Background technology
At laser field, people often obtain short wavelength laser output by nonlinear crystal.Continuous light is adopted the intracavity frequency doubling mode more, and its structure is complicated, and especially so-called " green glow noise " often makes laser power higher noise occur, and to the intracavity frequency doubling of high power continuous light, the optical element in the easy damaged laser cavity.As adopt the cavity external frequency multiplication mode, and then require the long strict control in chamber, make very complicatedly, and the continuous light single passes through nonlinear crystal, light-phototranstormation efficiency is very low.Under the small-signal situation, shg efficiency is directly proportional with nonlinear crystal length, but nonlinear crystal costs an arm and a leg usually, and size is difficult to do very greatly simultaneously.
The utility model content
At the problems referred to above, the utility model proposes a kind of volume frequency multiplier littler and simple in structure and solve.
The technical solution of the utility model is:
The noncritical phase matching frequency multiplier is to be coated with the fundamental wave antireflective coating at the input path place of noncritical phase matching crystal, the emitting light path place be coated with frequency doubled light or and light antireflective coating frequently, other parts of its both sides are provided with in order to the fundamental wave that light beam " Z " font is launched back and forth and frequency doubled light or and optical reflection film layer frequently.
Further, the light at the input path place incident angle that enters the noncritical phase matching crystal is subjected within the scope for the noncritical phase matching corner connection of this noncritical phase matching crystal.
Further, mode one: described fundamental wave and frequency doubled light or and frequently the optical reflection film layer directly be plated on both sides on the noncritical phase matching crystal.
Further, mode two: described fundamental wave and frequency doubled light or and frequently the optical reflection film layer be plated on the plain film, described plain film is positioned over the both sides of noncritical phase matching crystal again.
Further, mode three: described fundamental wave and frequency doubled light or and frequently the optical reflection film layer be plated on the concave surface sheet, described concave surface sheet is positioned over the both sides of noncritical phase matching crystal again.
Further, mode four: described fundamental wave and frequency doubled light or and frequently the optical reflection film layer be plated on plain film and the concave surface sheet, described plain film is positioned over a side of noncritical phase matching crystal, described concave surface sheet is positioned over the opposite side of noncritical phase matching crystal.
The optical texture that noncritical phase matching frequency multiplier module of the present utility model constitutes is that lens and phase compensator are placed in the between any two insertion of a plurality of described noncritical phase matching frequency multipliers on linear light path.Perhaps, concave mirror and phase compensator are placed in the between any two insertion of a plurality of described noncritical phase matching frequency multipliers on " Z " font light path.
The utility model adopts technique scheme, has the littler volume of original relatively frequency multiplier, and simple and reasonable advantage.Needing can be widely used in the field of laser freuqency doubling.
Description of drawings
Fig. 1 is the synoptic diagram of embodiment one of the present utility model;
Fig. 2 is the synoptic diagram of embodiment two of the present utility model;
Fig. 3 (a) is the synoptic diagram of embodiment three of the present utility model;
Fig. 3 (b) is the synoptic diagram of embodiment four of the present utility model;
Fig. 4 (a) is the synoptic diagram of first kind of optical texture of the utility model formation;
Fig. 4 (b) is the synoptic diagram of second kind of optical texture of the utility model formation.
Embodiment
Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.
It is very big usually to accept the angle when non-linear frequency-doubling crystal is realized critical phase matching, and when 1.064 μ m realized noncritical phase matching, it accepts the angle was θ as LBO
0=260mrad, promptly 15 °.
Of the present utility model first implements structure as shown in Figure 1, and wherein 101 is the noncritical phase matching crystal, and the S1 face removes the A part, and the S2 face is except that the remaining surface plating fundamental wave of B part and frequency doubled light or and frequency optical reflection film.The A part, i.e. fundamental wave incident place plating fundamental wave anti-reflection film S3; The B part, i.e. frequency doubled light outgoing place plating frequency doubled light or and frequency light anti-reflection film S4.If incident light and reflected light angle are θ, light beam is d in same reflecting surface adjacent spots centre distance, and nonlinear crystal length is L, then θ ≈ d/L.When θ＜＜θ
0Because crystal 101 optical axises are basic vertical with reflecting surface, fundamental wave is at crystal 101 reflex time back and forth, the fundamental wave that produces and frequency multiplication or and frequently the walk-off effect (work-off) of light can ignore, thereby fundamental wave is repeatedly passed through in nonlinear crystal 101, and this will prolong frequency multiplication or and the equivalent length of crystal frequently greatly.
The second enforcement structural principle of Fig. 2 and first embodiment of Fig. 1 are similar, and wherein 101 are the noncritical phase matching crystal, and 202,203 are plane mirror, and be high anti-to first-harmonic and higher hamonic wave simultaneously.Plane mirror 202 places plane mirror 201 left ends; Plane mirror 203 places plane mirror 201 right-hand members.Plane mirror 202, plane mirror 203 leave the space so that fundamental wave incident and frequency doubled light output.Because air refraction is about 1, thus can be similar to think fundamental wave and frequency doubled light or and frequency light do not produce chromatic dispersion.
Shown in Fig. 3 (a) the 3rd implements the principle of structure with first embodiment of Fig. 1 or second embodiment of Fig. 2.Wherein, 101 noncritical phase matching crystal, 3021,3022 ..., 302N is concave mirror.Because concave mirror 3021,3022 ..., the focusing function of 302N can make fundamental wave broken hair loose, and adopts this structure can make laser beam maintain higher power density.
Shown in Fig. 3 (b) the 4th implements similar and implements structure in the 3rd shown in Fig. 3 (a).It is adopt plane mirror 3031,3032 ..., 303N and concave mirror 3021,3022 ..., 302N realizes fundamental wave repeatedly by noncritical phase matching crystal 101, and light beam can not dispersed very soon.
Optical texture shown in Fig. 4 (a) is an application mode of the present utility model, comprises frequency multiplier module 4011,4012,4013 and 4014, lens 4041,4042,4043, phase compensation sheet 4031,4032,4033.Wherein the frequency multiplier module can be single frequency-doubling crystal, and the various noncritical phase matching crystal that also can be shown in Fig. 1, Fig. 2 or Fig. 3 (a), Fig. 3 (b) are implemented structure.Because light path is longer between each frequency multiplier, the air chromatic dispersion be can not ignore, for make fundamental wave and frequency multiplication or and frequently light enter that phase place is consistent in the next stage frequency multiplier, the utility model adopts the phase compensation sheet 4031,4032,4033 of optical wedge gusset plate or crystal plain film to regulate fundamental wave and frequency doubled light phase differential, and each element arrangements is on same direction, and this helps the adjustment of optics and integrally-built succinct.
Second kind of optical texture principle of Fig. 4 (b) and first kind of optical texture of Fig. 4 (a) are similar, comprise frequency multiplier module 4011,4012,4013,4014 and 4015, concave mirror 4021,4022,4023 and 4024, phase compensation sheet 4031,4032,4033 and 4034. Concave mirror 4021,4022,4023 and 4024 and phase compensator 4031,4032,4033 and 4034 are placed in the between any two insertion of a plurality of described noncritical phase matching frequency multiplier modules 4011,4012,4013,4014 and 4015 on " Z " font light path.The utility model adopts the phase compensation sheet 4031,4032,4033 and 4034 of optical wedge gusset plate or crystal plain film to regulate fundamental wave and frequency doubled light phase differential, and adopts concave mirror 4021,4022,4023 and 4024 to make beam diameter maintain designed scope.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection domain of the present utility model.
Claims (8)
1. noncritical phase matching frequency multiplier, it is characterized in that: the input path place of noncritical phase matching crystal (101) (A district) is coated with fundamental wave antireflective coating (S3), emitting light path place (B district) be coated with frequency doubled light or and light antireflective coating (S4) frequently, other parts of its both sides are provided with in order to the fundamental wave that light beam " Z " font is launched back and forth and frequency doubled light or and optical reflection film layer (S1 and S2) frequently.
2. noncritical phase matching frequency multiplier according to claim 1 is characterized in that: the incident angle that the light in input path place (A district) enters noncritical phase matching crystal (101) is subjected within the scope for the noncritical phase matching corner connection of this noncritical phase matching crystal (101).
3. noncritical phase matching frequency multiplier according to claim 1 is characterized in that: described fundamental wave and frequency doubled light or and frequently optical reflection film layer (S1 and S2) directly be plated on both sides on the noncritical phase matching crystal (101).
4. noncritical phase matching frequency multiplier according to claim 1, it is characterized in that: described fundamental wave and frequency doubled light or and frequently optical reflection film layer (S1 and S2) be plated on the plain film, described plain film is positioned over the both sides of noncritical phase matching crystal (101) again.
5. noncritical phase matching frequency multiplier according to claim 1, it is characterized in that: described fundamental wave and frequency doubled light or and frequently optical reflection film layer (S1 and S2) be plated on the concave surface sheet, described concave surface sheet is positioned over the both sides of noncritical phase matching crystal (101) again.
6. noncritical phase matching frequency multiplier according to claim 1, it is characterized in that: described fundamental wave and frequency doubled light or and frequently optical reflection film layer (S1 and S2) be plated on plain film and the concave surface sheet, described plain film is positioned over a side of noncritical phase matching crystal (101), and described concave surface sheet is positioned over the opposite side of noncritical phase matching crystal (101).
7. according to the arbitrary described noncritical phase matching frequency multiplier of claim 1-6, it is characterized in that: lens and phase compensator are placed in the between any two insertion of a plurality of described noncritical phase matching frequency multipliers on linear light path.
8. according to the arbitrary described noncritical phase matching frequency multiplier of claim 1-6, it is characterized in that: concave mirror and phase compensator are placed in the between any two insertion of a plurality of described noncritical phase matching frequency multipliers on " Z " font light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201383462U CN201397438Y (en) | 2009-05-15 | 2009-05-15 | Non-critical phase matching frequency doubler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201383462U CN201397438Y (en) | 2009-05-15 | 2009-05-15 | Non-critical phase matching frequency doubler |
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| Publication Number | Publication Date |
|---|---|
| CN201397438Y true CN201397438Y (en) | 2010-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201383462U Expired - Fee Related CN201397438Y (en) | 2009-05-15 | 2009-05-15 | Non-critical phase matching frequency doubler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278128A (en) * | 2013-05-17 | 2013-09-04 | 中国工程物理研究院激光聚变研究中心 | Rapid and accurate measuring method for optimum matching angle of KDP (potassium dihydrogen phosphate) crystal |
-
2009
- 2009-05-15 CN CN2009201383462U patent/CN201397438Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278128A (en) * | 2013-05-17 | 2013-09-04 | 中国工程物理研究院激光聚变研究中心 | Rapid and accurate measuring method for optimum matching angle of KDP (potassium dihydrogen phosphate) crystal |
| CN103278128B (en) * | 2013-05-17 | 2015-11-04 | 中国工程物理研究院激光聚变研究中心 | One is KDP crystal optimum matching angle accurate measurement method fast |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100203 Termination date: 20130515 |