CN201041920Y - Ultraviolet output optical system - Google Patents
Ultraviolet output optical system Download PDFInfo
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- CN201041920Y CN201041920Y CNU2007200505139U CN200720050513U CN201041920Y CN 201041920 Y CN201041920 Y CN 201041920Y CN U2007200505139 U CNU2007200505139 U CN U2007200505139U CN 200720050513 U CN200720050513 U CN 200720050513U CN 201041920 Y CN201041920 Y CN 201041920Y
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- ultraviolet
- laser
- harmonic
- level crossing
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Abstract
The utility model relates to a UV output optical system used for a harmonic solid UV laser, the UV output optical system consists of a laser cavity folding flat mirror and one or more UV output flat mirrors. The UV output flat mirror is a multilayered medium film multi-wavelength reflection transmission flat mirror. The UV output optical system of the utility model can filter the fundamental waves and secondary harmonic components mixed in the UV output beams, and greatly enhance the transmittance of UV output light simultaneously. The utility model has the advantages of compact structure and small bulk.
Description
[technical field]
The utility model relates to a kind of optic system for outputting ultraviolet, refers in particular to a kind of optic system for outputting ultraviolet that is used for the employing dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing combination of harmonic wave solid ultraviolet laser.
[background technology]
Harmonic wave solid ultraviolet laser is to adopt the method for the non-linear high order harmonic component generation of first-harmonic to export the solid state laser of laser to obtain the ultraviolet light wave band.The solid ultraviolet laser has irreplaceable extensive use in fields such as material retrofit, biomedicines.
Because the method that high order harmonic component produces, the ultraviolet light beam of first-harmonic, second harmonic and high order harmonic component all has the light path of coincidence usually, when even the high order harmonic component crystal places resonant cavity outer, owing to can not accomplish 100% of first-harmonic is reflected to the high-reflecting film of first-harmonic, and fundamental power is quite high in the chamber, so still contain the first-harmonic composition of significant proportion in the high order harmonic component light beam.These first-harmonic and second harmonics that are blended in the ultraviolet output beam must be removed away from final ultraviolet output beam, with the application that guarantees Ultra-Violet Laser be not mingled in wherein first-harmonic and the influence of second harmonic power, guarantee the fineness of materials processing.
From following experimental data as seen, see also Fig. 1, before not adopting optic system for outputting ultraviolet of the present utility model, ultraviolet output laser is after level crossing M5 reflection output, be mixed with first-harmonic and second harmonic, gross power is 5.66W, after the quartz prism beam split, the gross power of three wavelength is 4.32W, wherein 1064nm 0.99w; 532nm 0.29w; The 355nm ultraviolet light is 3.04w.First-harmonic and second harmonic luminous power account for 30% of gross output.
If use ultraviolet band pass filter, as adopt the ZWB1 (UG11 that is equivalent to German Schott) of Shanghai coloured optical glass factory, to the transmitance of ultraviolet 355nm about 80%, because infrared 1064nm is still had seeing through of a few percent, so need with 2 ZWB1, like this, the light transmittance of ultraviolet only is about 60%.Moreover, be the solid ultraviolet laser of watt level for power output, filter is very fast cracked owing to generating heat after watt level laser power irradiation.So generally all use the prism beam split.Just 532nm is separated from ultraviolet 355nm as the patent CN2805154Y of Northwest University (on August 9th, 2006), see also Fig. 2 with the method.As this method of front analysis of experimental data the transmitance of ultraviolet light is about 76%, and, spatially need long distance just can separate light beams of different wavelengths.
Therefore, provide a kind of ultraviolet power output height, output ultraviolet light purity height, the optic system for outputting ultraviolet that is used for harmonic wave solid ultraviolet laser that space hold is few is real in necessary.
[summary of the invention]
The purpose of this utility model provides a kind of ultraviolet power output height, output ultraviolet light purity height, the optic system for outputting ultraviolet that space hold is few.
For realizing the utility model purpose, provide following technical scheme:
A kind of optic system for outputting ultraviolet that is used for harmonic wave solid ultraviolet laser is provided, this optic system for outputting ultraviolet comprises the folding level crossing of laser cavity and at least one ultraviolet output plane mirror, and this ultraviolet output plane mirror is a dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing.
According to different application, different for the overanxious requirement of first-harmonic, second harmonic, can a ultraviolet output plane of corresponding employing mirror, perhaps adopt two or three ultraviolet output plane mirrors combinations.Fold level crossing as the laser outgoing mirror with laser cavity, the laser of output is through described one or two or three ultraviolet output plane mirrors, effectively filter first-harmonic and the second harmonic light component that is mingled in the ultraviolet output beam, significantly improved the transmitance of ultraviolet output light, and this optic system for outputting ultraviolet compact conformation, volume are little.Experimental results show that optic system for outputting ultraviolet described in the utility model be applicable to power from milliwatt to solid ultraviolet laser up to 5～7 watts.
Adopt the harmonic wave solid ultraviolet laser of optic system for outputting ultraviolet described in the utility model, it comprises pumping source, pump optical transmission system, laser work crystal, second harmonic crystal, high order harmonic component crystal, laserresonator, Q-switching device and optic system for outputting ultraviolet, this optic system for outputting ultraviolet comprises the folding level crossing of laser cavity and at least one ultraviolet output plane mirror, and this ultraviolet output plane mirror is a dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing.
This laserresonator is made up of laserresonator plane reflection chamber mirror and plano-concave reflecting cavity mirror, refrative cavity level crossing.This Q-switching device and second harmonic crystal place in this laserresonator.This second harmonic crystal also is positioned at laserresonator.
This pumping source is a diode pumping, adopts the fiber-coupled diode array by pump optical transmission system and refrative cavity level crossing the laser work crystal to be carried out double-end pumping.This pump optical transmission system is profile pump or end pumping.
Compared with prior art, the utlity model has following advantage:
Optic system for outputting ultraviolet described in the utility model has significantly improved the transmitance of ultraviolet output light when effectively filtering the first-harmonic and second harmonic light component that is mingled in the ultraviolet output beam, have compact conformation, advantage that volume is little.Experimental results show that optic system for outputting ultraviolet described in the utility model be applicable to power from milliwatt to solid ultraviolet laser up to 5～7 watts.
[description of drawings]
Fig. 1 is without three wavelength light power division figure in the ultraviolet output beam of optic system for outputting ultraviolet;
Fig. 2 is that the existing 532nm wavelength light being separated with prismatic decomposition obtains 355nm wavelength light diagram;
Fig. 3 is the optic system for outputting ultraviolet light path principle figure of the utility model harmonic wave solid ultraviolet laser;
Fig. 4 is one of the light path principle figure of the utility model embodiment two and experimental result;
Fig. 5 is two of the light path principle figure of the utility model embodiment two and an experimental result.
[embodiment]
Be described in further detail below in conjunction with the operation principle of embodiment multilayer dielectric film multi-wavelength reflection and transmission level crossing combination optic system for outputting ultraviolet disclosed in the utility model.Embodiment one is a quadruple 266nm solid ultraviolet laser outside intracavity frequency doubling, the chamber, and its light path principle figure is seen Fig. 3.Embodiment two is intracavity frequency doubling and mixing 355nm solid ultraviolet laser, and its light path principle is seen accompanying drawing 4.
The utility model provides a kind of harmonic wave solid ultraviolet laser of being used for, the optic system for outputting ultraviolet that only makes up without prismatic decomposition with dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing, this optic system for outputting ultraviolet comprises the folding level crossing of laser cavity and two ultraviolet output plane mirrors, this ultraviolet output plane mirror is a dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing, its structure plane reflection diaphotoscope 6 as shown in Figure 3,9,10.
Harmonic wave solid ultraviolet laser in the embodiment one is by pump optical system 15,16,13,14,17,18,3,5, folding laserresonator 1,2,3,4,5,6,12,7, quadruple device 8,11,6,7 and optic system for outputting ultraviolet 6,9,10 are formed outside intracavity frequency doubling crystal 12, the chamber.The pump optical system is by pumping semiconductor diode array 15,16 warps and optical fiber 13,14 coupling backs are by fiber-optic output, by pump optical transmission system 17,18 also through folding the folding level crossing 3 of laserresonator, 5, the pumping light power of 808nm focused in the laser work crystal 4 form population inversion.
Spontaneous and the stimulated radiation that fundamental wave of laser is formed by population inversion in the laser work crystal 4 is via resonant cavity level crossing 7 peaceful concave mirrors 1, in folding laserresonator light path 1-2-3-4-5-6-12-7 back and forth repeatedly vibration form resonance.Fundamental power acts in the chamber and produces second harmonic in two frequency-doubling crystals 12 in the chamber, act on repeatedly back and forth between the light path 7-12-6-11-8 of second harmonic quadruple device outside folding laserresonator and chamber outside the chamber on the quadruple frequency crystal 11, improved the utilance of second harmonic.The four-time harmonic 266nm Ultra-Violet Laser that is produced is to level crossing 8 and 6 two-way advancing, after level crossing 8 reflections, by level crossing 6 outputs.
From the Ultra-Violet Laser of level crossing 6 directive optic system for outputting ultraviolet midplane mirrors 9, be mixed with first-harmonic 1064nm near-infrared from transmission to the flat-folded chamber 6 that spill from flat-folded chamber mirror 5 reflection and the green glow of the part second harmonic 532nm that reflects by flat-folded mirror 6 through quadruple frequency crystals 11 backs from level crossing 8.This two part is not only because two faces of level crossing 6 are hundred-percent reflection 1064nm and transmission 532nm, the plated film data of level crossing 6: two difference plated films, oblique incidence, S1:1064nm is high instead, 532nm is high, and S2:266nm is high instead, 532nm is high; 9,10 two in this ultraviolet output plane mirror is plated film respectively, oblique incidence, and S1:1064nm and 532nm are high saturating, and 266nm is high anti-, and S2:1064nm and 532nm are anti-anti-.Near-infrared 1064nm has 0.3% see through, and green glow 532nm has 5% reflection.The ultraviolet 266nm output light that is mixed with 1064nm first-harmonic and 532nm second harmonic from flat-folded mirror 6 behind twice reflective filter of level crossing 9-10, by the highly purified 266nm Ultra-Violet Laser of level crossing 10 outputs.
Laser resonant cavity mirror is coated with following rete: laserresonator plano-concave reflecting cavity mirror 1, and concave surface: normal incidence, 1064nm is high anti-; Refrative cavity level crossing 3,5, oblique incidence, S1:1064nm is high anti-, and 808nm is high saturating; S2:808nm is anti-anti-.Laserresonator plane reflection chamber mirror 7, single face, normal incidence, 1064nm and 532nm are high anti-.
Plane mirror 8, single face is coated with: normal incidence, 532nm and 266nm are high anti-; Second harmonic 532nm green glow comes back reflective repeatedly by quadruple frequency crystal 11 between level crossing 7,8, thereby has improved the utilization ratio with second harmonic.
Embodiment two, see Fig. 4, and wherein first-harmonic resonance chamber mirror is M1 and M2, and fundamental oscillation becomes a square frame among Fig. 4 with second harmonic generation mechanism simplifying in the chamber, and LBO is the third overtone crystal that places in the laserresonator.In embodiment two by the chamber in mixing produce the Ultra-Violet Laser of 355nm.The plated film designing requirement of three level crossing M5 in the dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing combination optic system for outputting ultraviolet: oblique incidence, S1:1064nm and 532nm are anti-anti-, S2:1064nm and 532nm are high saturating, 355nm is high anti-. behind such configuration process three mirror contact lens, 1064nm has only 0.0008% to pass through, 532nm has only 0.13% to pass through, and ultraviolet 355nm has the transmitance greater than 97%, the calculating of face as follows:
(99%)
3=97% ultraviolet 355nm transmitance (in 355nm reflectivity 99%)
(2%)
3=0.0008% 1064nm transmitance (in 1064nm transmissivity 98%)
(5%)
3=0.125% 532nm transmitance (in 1064nm transmissivity 95%)
From the experimental data of accompanying drawing 4,5, when power meter being placed on when only surveying at a distance isolated 355nm uv power, the power meter reading is 2.5W, sees Fig. 5.If power meter is placed near prism output face place, see Fig. 4, make the light of three kinds of wavelength all inject power meter, the reading of power meter still is 2.5W, this shows, behind three mirror contact lens, the power of far infrared 1064nm (first-harmonic) and green glow 532nm (second harmonic) has dropped to negligible degree, thereby has obtained the very high 355nm ultraviolet output light of purity.The entire ultraviolet optic system for outputting to the loss of ultraviolet light less than 3%.
Dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing combination optic system for outputting ultraviolet disclosed in this invention can effectively filter and be mixed in output intrafascicular first-harmonic of Ultra-Violet Laser and second harmonic composition, and the entire ultraviolet optic system for outputting can be up to 97% to the transmitance of ultraviolet light.Experiment showed, this system can power up to the 355nm ultraviolet power output of 7W under normal operation.
The above only is a preferable embodiment of the present utility model; protection range of the present utility model is not limited thereto, and those of skill in the art are any to be included within the utility model protection range based on non-material change on the technical solutions of the utility model.
Claims (10)
1. optic system for outputting ultraviolet that is used for harmonic wave solid ultraviolet laser, it is characterized in that, this optic system for outputting ultraviolet comprises that laser cavity folds level crossing (6) and at least one or a plurality of ultraviolet output plane mirror (9,10), and this ultraviolet output plane mirror is a dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing.
2. optic system for outputting ultraviolet as claimed in claim 1 is characterized in that, (6) two difference of this folding level crossing plated film, and oblique incidence, S1:1064nm is high instead, 532nm is high, and S2:266nm is high instead, 532nm is high; Two in this ultraviolet output plane mirror (9,10) is plated film respectively, oblique incidence, and S1:1064nm and 532nm are high saturating, and 266nm is high anti-, and S2:1064nm and 532nm are anti-anti-.
3. harmonic wave solid ultraviolet laser that adopts optic system for outputting ultraviolet as claimed in claim 1 or 2, it comprises pumping source, pump optical transmission system, laser work crystal, second harmonic crystal, high order harmonic component crystal, laserresonator, Q-switching device and optic system for outputting ultraviolet, it is characterized in that, this optic system for outputting ultraviolet comprises the folding level crossing of laser cavity and at least one ultraviolet output plane mirror, and this ultraviolet output plane mirror is a dielectric multi-layer optical thin film multi-wavelength reflection and transmission level crossing.
4. harmonic wave solid ultraviolet laser as claimed in claim 3 is characterized in that, this laserresonator is made up of laserresonator plane reflection chamber mirror and plano-concave reflecting cavity mirror, refrative cavity level crossing.
5. harmonic wave solid ultraviolet laser as claimed in claim 4 is characterized in that this Q-switching device and second harmonic crystal place in this laserresonator.
6. harmonic wave solid ultraviolet laser as claimed in claim 3, it is characterized in that, this pumping source is a diode pumping, adopt optical fiber (13,14) the coupling diode array (15,16) by pump optical transmission system (17,18) and refrative cavity level crossing (3,5) laser work crystal (4) is carried out double-end pumping.
7. as claim 3 or 6 described harmonic wave solid ultraviolet lasers, it is characterized in that this pump optical transmission system is profile pump or end pumping.
8. harmonic wave solid ultraviolet laser as claimed in claim 3 is characterized in that, this second harmonic crystal (12) is positioned at laserresonator.
9. harmonic wave solid ultraviolet laser as claimed in claim 3 is characterized in that, (6) two difference of this folding level crossing plated film, and oblique incidence, S1:1064nm is high instead, 532nm is high, and S2:266nm is high instead, 532nm is high; Two in this ultraviolet output plane mirror (9,10) is plated film respectively, oblique incidence, and S1:1064nm and 532nm are high saturating, and 266nm is high anti-, and S2:1064nm and 532nm are anti-anti-.
10. harmonic wave solid ultraviolet laser as claimed in claim 3 is characterized in that this laser resonant cavity mirror is coated with following rete: the plano-concave reflecting cavity mirror (1) of laserresonator, and concave surface: normal incidence, 1064nm is high anti-; Refrative cavity level crossing (3,5), oblique incidence, S1:1064nm is high anti-, and 808nm is high saturating; S2:808nm is anti-anti-; Plane reflection chamber mirror (7), single face, normal incidence, 1064nm﹠amp; 532nm is high anti-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200505139U CN201041920Y (en) | 2007-04-19 | 2007-04-19 | Ultraviolet output optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200505139U CN201041920Y (en) | 2007-04-19 | 2007-04-19 | Ultraviolet output optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201041920Y true CN201041920Y (en) | 2008-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200505139U Expired - Lifetime CN201041920Y (en) | 2007-04-19 | 2007-04-19 | Ultraviolet output optical system |
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| CN (1) | CN201041920Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110367703A (en) * | 2019-08-05 | 2019-10-25 | 河南城建学院 | A kind of file cabinet saving precious file |
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2007
- 2007-04-19 CN CNU2007200505139U patent/CN201041920Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110367703A (en) * | 2019-08-05 | 2019-10-25 | 河南城建学院 | A kind of file cabinet saving precious file |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20080326 Effective date of abandoning: 20070419 |