CN102073187B - Crystal frequency multiplier - Google Patents
Crystal frequency multiplier Download PDFInfo
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- CN102073187B CN102073187B CN2010105814949A CN201010581494A CN102073187B CN 102073187 B CN102073187 B CN 102073187B CN 2010105814949 A CN2010105814949 A CN 2010105814949A CN 201010581494 A CN201010581494 A CN 201010581494A CN 102073187 B CN102073187 B CN 102073187B
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Abstract
The present invention discloses a crystal frequency multiplier. By adopting the Walk-Off effect of a nonlinear crystal, frequency multiplication ultraviolet light of e light produced in a nonlinear process is reflected by a side face and is transmitted out through another side face at a Brewster angle. Therefore, the output end of a crystal apparatus needs not to be coated with a membrane related to the frequency multiplication light, a membrane layer can be prevented from being damaged by light in the frequency multiplication ultraviolet light capable of damaging the membrane layer, and the coating process can be simplified.
Description
Technical field
The present invention relates to laser field, particularly relate to a kind of crystal frequency multiplier.
Background technology
Generally, in order to reduce the cavity loss of laser instrument, reduce threshold value, improve output power, we often need plate anti-reflection film or utilize Brewster angle to reduce reflectivity on the logical light face of laser crystal.But for the coating materials of routine, the irradiation of Ultra-Violet Laser will produce irreversible damage, thus make the cavity loss of laser instrument seriously rise, greatly improved laser instrument threshold value, reduce work efficiency.Then there is bigger difference in the Brewster angle of fundamental frequency light and frequency doubled light, is difficult to realize simultaneously antireflective effect.Conventional processing mode is to use special ultraviolet coating materials to carry out plated film, reduce uv absorption with the damage of minimizing to rete, but long-term Ultra-Violet Laser still possibly cause damage to this rete.This causes work efficiency, serviceability and the mission life of doubling frequency ultraviolet laser to receive serious limit undoubtedly.
Summary of the invention
To the problems referred to above; The objective of the invention is to design a kind of crystal frequency multiplier; The output terminal that reaches quartz crystal device need not to plate the film system relevant with ultraviolet frequency double light, and then prevents that ultraviolet frequency double light from damaging rete the damage light of rete, has also simplified the purpose of the technology difficulty of plated film simultaneously.
For achieving the above object; The technical scheme that the present invention proposes is: a kind of crystal frequency multiplier; Be used to produce ultraviolet frequency double light; It is characterized in that: described crystal incident end face (101) becomes to make incident fundamental frequency light to produce the angle of walk-off effect with optical axis (102) direction of crystal frequency multiplier; And frequency multiplication e light (106) is walked from the corresponding side of direction and is finished to frequency multiplication e light total reflection face (105), and another side polishing relative with above-mentioned fully reflecting surface is slit into the angle (103) that becomes Brewster angle with the frequency multiplication e light (106) of fully reflecting surface reflection.
Further; As optimal way of the present invention; For fear of the ultraviolet light that produces near the fundamental frequency light output end after offside reflection from the output of fundamental frequency optical output port, in the fully reflecting surface (105) near the crystal frequency multiplier surface frosted (104) of fundamental frequency light output end face (107).
Further, described incident fundamental frequency light is O light or O light and e light.
Further, as a kind of optimal way of the present invention, described crystal frequency multiplier fundamental frequency light-incident end (101) is coated with anti-reflection film or described fundamental frequency light that fundamental frequency light height is passed through with output end face (107) and becomes Brewster angle with output terminal.
The present invention provides a kind of Walk-Off that utilizes nonlinear crystal (walk from) effect (promptly when the not parallel also out of plumb of the optical axis of the direction of propagation of light beam and crystal; The wave vector direction of e light will be separated with the energy flux density direction, produce so-called Walk-off (walk from) phenomenon) make produce in the non-linear process for the ultraviolet frequency double light of e light by offside reflection and in another side with the ultraviolet laser manufacture of Brewster angle output.On the logical light face of fundamental frequency light, will only need the anti-reflection film of plating fundamental frequency light or utilize Brewster angle to carry out anti-reflection; Simplify the coating process of the device anti-reflection film of laser instrument, helped the threshold value that realizes lower cavity loss, reduces laser instrument, the output power of raising laser instrument etc.These improve for making more excellent ultraviolet laser has great help.Frequency doubled light will continue to produce in the whole process of frequency-doubling crystal because fundamental frequency light passes; Export from the fundamental frequency optical output port after offside reflection for fear of the ultraviolet light that produces near the fundamental frequency light output end, need carry out frosted near the frequency-doubling crystal side of fundamental frequency light output end and handle.
Description of drawings
Fig. 1 is the typical structure of patent crystal frequency multiplier of the present invention;
The front view of Fig. 2 patent working example 1 of the present invention;
Fig. 3 is the vertical view of patent of invention embodiment 1;
Fig. 4 is the concrete structure figure of patent working example 2 of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
Typical structure like Fig. 1 crystal frequency multiplier is said; A kind of crystal frequency multiplier; Be used to produce ultraviolet frequency double light; It is characterized in that: described crystal frequency multiplier incident end face (101) becomes to make incident fundamental frequency light to produce the angle of walk-off effect with optical axis (102) direction; And frequency multiplication e light (106) is walked from the corresponding side of direction and is finished to frequency multiplication e light total reflection face (105), and another side polishing relative with above-mentioned fully reflecting surface is slit into the angle (103) that becomes Brewster angle with the frequency multiplication e light (106) of fully reflecting surface reflection.
Incident fundamental frequency light o light as shown in Figure 1 passes through frequency-doubling crystal; And produce frequency doubled light e light in this course; Frequency doubled light is walked to leave and (being fully reflecting surface 105) generation total reflection in the frequency-doubling crystal side of polishing, and the back can't harm outgoing from that relative crystal on side face of above-mentioned fully reflecting surface (105) with Brewster angle (103).The fully reflecting surface of frequency doubled light (103) can be parallel with the optics track of fundamental frequency light o light, also can be to present certain angle.
In addition; Frequency doubled light will continue to produce in the whole process of frequency-doubling crystal because fundamental frequency light passes; For fear of produce near the fundamental frequency light output end be the ultraviolet frequency double light of e light in fully reflecting surface (103) reflection back from the output of fundamental frequency optical output port, need carry out the frosted processing near the frequency-doubling crystal side of fundamental frequency light o light output end.
For reaching better effect, described crystal fundamental light-incident end (101) and output end face (107) are coated with the anti-reflection film that fundamental frequency light height is passed through.
Embodiment 1
As Fig. 2, shown in Figure 3 be shown in the embodiment of the invention 1; Frequency-doubling crystal is injected, penetrated to incident fundamental frequency light with Brewster angle; And produce frequency doubled light e light in this course; Frequency doubled light is walked to leave and in the frequency-doubling crystal side of polishing total reflection is taken place, and the back can't harm outgoing from the relative crystal on side face of fully reflecting surface with Brewster angle.Be similar to shown in Figure 1ly, the reflecting surface of frequency doubled light can be parallel with the optics track of fundamental frequency light o light, also can be to present certain angle.Frequency doubled light will continue to produce in the whole process of frequency-doubling crystal because fundamental frequency light passes; For fear of produce near the fundamental frequency light output end be the ultraviolet frequency double light of e light after offside reflection from the output of fundamental frequency optical output port, need carry out frosted (204) processing near the frequency-doubling crystal side of fundamental frequency light o light output end.
Embodiment 2
Shown in Fig. 4 embodiment of the invention 2; Incident fundamental frequency light (comprising o light and e light simultaneously) is through being coated with the frequency-doubling crystal of fundamental frequency light anti-reflection film; And produce frequency doubled light e light in this course; Total reflection takes place in the frequency-doubling crystal side of polishing in the e light λ 1 of fundamental frequency light and the frequency doubled light e light λ 2 that produces, and frequency doubled light can't harm outgoing from that relative crystal on side face of fully reflecting surface with Brewster angle thereupon.Be similar to shown in Figure 1ly, the reflecting surface of frequency doubled light can be parallel with the optics track of fundamental frequency light o light, also can be to present certain angle.Frequency doubled light will continue to produce in the whole process of frequency-doubling crystal because fundamental frequency light passes; Export from the fundamental frequency optical output port after offside reflection for fear of the e light ultraviolet frequency double light that produces near the fundamental frequency light output end, need carry out frosted near the frequency-doubling crystal side of fundamental frequency light o light output end and handle.
What in sum, the present invention utilized Walk-Off (the walk from) effect of nonlinear crystal to make to produce in the non-linear process exports with Brewster angle by offside reflection and in another side for the ultraviolet frequency double light of e light.Thereby the output terminal that makes quartz crystal device need not to plate the film system relevant with ultraviolet frequency double light, thus avoid ultraviolet frequency double light to the damage light of rete to the rete damage problem, also simplified the technology difficulty (only need carry out plated film) of plated film simultaneously to fundamental frequency light.
Although specifically show and introduced this patent in conjunction with preferred embodiment; But the those skilled in the art should be understood that; In the spirit and scope of the present invention that do not break away from appended claims and limited; Can make various variations to the present invention in form with on the details, be protection scope of the present invention.
Claims (6)
1. crystal frequency multiplier; Be used to produce ultraviolet frequency double light; It is characterized in that: the incident end face of described crystal frequency multiplier (101) becomes to make incident fundamental frequency light to produce the angle of walk-off effect with the optical axis (102) of crystal frequency multiplier; And frequency multiplication e light (106) is walked from the corresponding side of direction and is finished to frequency multiplication e light total reflection face (105), and another side polishing relative with above-mentioned fully reflecting surface is slit into the angle (103) that becomes Brewster angle with the frequency multiplication e light (106) of fully reflecting surface reflection.
2. a kind of crystal frequency multiplier according to claim 1 is characterized in that in the described fully reflecting surface (105) near the surperficial frosted (104) of the crystal frequency multiplier of fundamental frequency light output end face (107).
3. a kind of crystal frequency multiplier according to claim 1 is characterized in that described incident fundamental frequency light is O light or O light and e light.
4. a kind of crystal frequency multiplier according to claim 1 is characterized in that described fully reflecting surface (105) is parallel with the optics track of fundamental frequency light o light or presents certain angle.
5. according to the described a kind of crystal frequency multiplier of the arbitrary claim of claim 1-4, it is characterized in that described crystal frequency multiplier fundamental frequency light-incident end (101) and output end face (107) are coated with the anti-reflection film that fundamental frequency light height is passed through.
6. according to the described a kind of crystal frequency multiplier of the arbitrary claim of claim 1-4, it is characterized in that frequency-doubling crystal is injected, penetrated to described incident fundamental frequency light with Brewster angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105814949A CN102073187B (en) | 2010-12-10 | 2010-12-10 | Crystal frequency multiplier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105814949A CN102073187B (en) | 2010-12-10 | 2010-12-10 | Crystal frequency multiplier |
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| Publication Number | Publication Date |
|---|---|
| CN102073187A CN102073187A (en) | 2011-05-25 |
| CN102073187B true CN102073187B (en) | 2012-10-31 |
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| CN2010105814949A Active CN102073187B (en) | 2010-12-10 | 2010-12-10 | Crystal frequency multiplier |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050880A (en) * | 2012-12-28 | 2013-04-17 | 清华大学 | Laser walk-off effect compensation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3856380A (en) * | 1973-05-15 | 1974-12-24 | Us Navy | Prism to separate a second harmonic from its fundamental frequency |
| CN101539703A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Frequency multiplier |
-
2010
- 2010-12-10 CN CN2010105814949A patent/CN102073187B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3856380A (en) * | 1973-05-15 | 1974-12-24 | Us Navy | Prism to separate a second harmonic from its fundamental frequency |
| CN101539703A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Frequency multiplier |
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| CN102073187A (en) | 2011-05-25 |
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