CN106207732B - A kind of method of two steps excitation continuous wave ultraviolet laser - Google Patents
A kind of method of two steps excitation continuous wave ultraviolet laser Download PDFInfo
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- CN106207732B CN106207732B CN201510210144.4A CN201510210144A CN106207732B CN 106207732 B CN106207732 B CN 106207732B CN 201510210144 A CN201510210144 A CN 201510210144A CN 106207732 B CN106207732 B CN 106207732B
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Abstract
The invention discloses a kind of method of two step excitation continuous wave ultraviolet laser, output wavelength becomes directional light for the output laser of 532nm frequency double lasers after collimating mirror collimates, and directional light is by focus lamp to Er：YAP crystal is close to the Er of focus lamp side：YAlO3Crystal end-face center, Er：YAlO3Er in crystal3+Pump light is absorbed, Er：YAlO3Ground state is in crystal4I15/2Er on energy level3+Excitation reaches2H11/2Energy level；It is in2H11/2The Er of energy level3+Pump light is absorbed, is in2H11/2The Er of energy level3+It transits to2P3/2Energy level, with2P3/2The Er of energy level3+Increase,2P3/2The Er of energy level3+Accumulation realizes population inversion and the output of 320nm up-conversion lasings.Quality for outputting laser beam of the present invention is high, efficiency is relatively high, laser is tunable, stability is good.
Description
Technical field
The invention belongs to field of laser device technology more particularly to a kind of methods of two step excitation continuous wave ultraviolet laser.
Background technology
Ultraviolet band laser light data storage, photoetching technique, CD control, micro Process, Atmospheric Survey, microelectronics,
The fields such as photochemistry, photobiology and medical treatment are widely used.Wherein ultraviolet continuous laser is killed in treatment skin disease, sterilization
The principal light source of poison, ore identification etc., the ultraviolet continuous lasers of wherein 320nm are the treatment skin disease (skins such as treatment psoriasis
Skin disease) principal light source.
Diode laser：The laser can be directly realized by the output of visible light wave range continuous laser, but the laser light exported
Beam quality is poor, it is impossible to reach the requirement of higher medical level.
Invention content
The purpose of the present invention is to provide a kind of methods of two step excitation continuous wave ultraviolet laser, it is intended to solve diode
The laser beam quality of laser output is poor, it is impossible to the problem of reaching higher medical level requirement.
The invention is realized in this way a kind of method of two steps excitation continuous wave ultraviolet laser, two step excitation are continuous
The method of wave ultraviolet laser includes：
Output wavelength becomes directional light for the output laser of 532nm frequency double lasers after collimating mirror collimates first, puts down
Row light is by focus lamp to Er:YAP crystal is close to the Er of focus lamp side:YAlO3At the center of crystal end-face, Er:YAlO3It is brilliant
Er in body3+Pump light is absorbed, Er:YAlO3Ground state is in crystal4I15/2Er on energy level3+Excitation reaches2H11/2Energy level；
Second in2H11/2The Er of energy level3+Pump light is further absorbed, is in2H11/2The Er of energy level3+It transits to2P3/2Energy
Grade, with2P3/2The Er of energy level3+It is more and more,2P3/2The Er of energy level3+Reach certain accumulation, realize population inversion and
320nm up-conversion lasings export；
The crystal for realizing continuous wave ultraviolet laser is excited to have Er doping oxides crystal, Er doped fluorides crystalline substance using two steps
Body；Double microchip crystal structures realize ultraviolet laser output in resonator；Quality for outputting laser beam is high, the light beam of laser output
Mass M2Factor ＜ 1.1 close to 1, the efficiency that laser continuously exports is 10% or so, and relatively high, laser is tunable, output
The stability of laser is good.
Further, under the action of laserresonator, the laser of 320nm forms oscillation in the resonator of laser, realizes
320nm switched lasers export.
Further, the Er:YAP crystal includes two Er:YAlO3Crystal；Two crystal are separately put, be conducive to alleviate by
The two crystal form the fuel factor of laser resonant cavity.
Close to focus lamp end Er:YAlO3515nm-565nm high-transmission rates, 310-330nm high are coated on the end face of crystal
The film of reflectivity, another end face are coated with the film of 515nm-565nm, 310-330nm high-transmission rate.It is plated on this crystal in this way
Film, can make crystal be coated with 515nm-565nm high-transmission rates, 310-330nm high reflectances film the suitable laser resonance in end face
One total reflection mirror of chamber, and another end face is coated with the film of 515nm-565nm, 310-330nm high-transmission rate, helps to reduce
The loss of pump light and laser transmission process, and then improve the transfer efficiency of laser.
Another piece of Er:YAlO3Crystal is coated with 515nm-565nm, 310-330nm high-transmission rate close to the end face at focus lamp end
Film, another end face be coated with 310-330nm transmissivities be 1% film.The plated film in this way on this crystal, at an end of crystal
Faceted crystal is coated with the film of 515nm-565nm, 310-330nm high-transmission rate, helps to reduce pump light and laser transmission process
Loss, and then the transfer efficiency of laser is improved, and the suitable laser of film that another end face 310-330nm transmissivities are 1%
One partial reflectance of resonator.
Further, the collimating mirror is the planoconvex spotlight that focal length is 35mm, this collimating mirror two sides is coated with 515nm-565nm high
Saturating film.This collimating mirror cooperation focus lamp uses, in Er:YAlO3Form about 857 μm of pump spot on crystal, it is big on crystal
Pump spot, convenient for improve Er:YAlO3The pump power injected in crystal.This collimating mirror two sides is coated with 515nm-565nm high
Saturating film helps to reduce loss of the pump light in transmission process, improves the utilization rate of pump light.
Further, the focus lamp be focal length be 75mm planoconvex spotlight, this focus lamp two sides be coated with 532nm high thoroughly
Film.This focus lamp cooperation collimating mirror uses, in Er:YAlO3Form about 857 μm of pump spot on crystal, big pump on crystal
Pu hot spot, convenient for improving Er:YAlO3The pump power injected in crystal.It is saturating that this focus lamp two sides is coated with 515nm-565nm high
Film helps to reduce loss of the pump light in transmission process, improves the utilization rate of pump light.
Description of the drawings
Fig. 1 is the Method And Principle schematic diagram of two steps excitation continuous wave ultraviolet laser provided in an embodiment of the present invention；
In figure：1st, frequency double laser；2nd, collimating mirror；3rd, focus lamp；4、Er:YAP crystal.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Below in conjunction with the accompanying drawings 1 and application of the specific embodiment to the method for two steps excitation continuous wave ultraviolet laser of the invention
Principle is further described.
The frequency double laser 1 that output wavelength is 532nm exports laser and becomes directional light after the collimation of collimating mirror 2, this is flat
Row light is after focus lamp 3, Er:YAP crystal 4 includes two Er:YAlO3Crystal, this directional light (pump light) focus on Er:
YAlO3Crystal is close to the Er of 3 side of focus lamp:YAlO3At the center of crystal end-face, Er:YAlO3Er in crystal3+Absorb pumping
Light, Er:YAlO3Ground state is in crystal4I15/2Er on energy level3+Excitation reaches2H11/2Energy level completes first step excitation, place
In2H11/2The Er of energy level3+Pump light is further absorbed, is in2H11/2The Er of energy level3+It transits to2P3/2Energy level, with2P3/2Energy level
Er3+It is more and more,2P3/2The Er of energy level3+Reach certain accumulation, realize population inversion；
Under the action of laserresonator, the laser of 320nm forms oscillation, this resonator plating two in the resonator of laser
Block Er:YAlO3On the end face of crystal, it is coated with that 515nm-565nm high is saturating, 310- on the end face close to focus lamp 3 end crystal
Film anti-330nm high, another piece of Er:YAlO3Crystal is coated with 310-330nm transmitances on the end face of laser output
1% film, in high level2P3/2The a large amount of Er of energy level3+To low-lying level4I15/2Energy level transition is realized to convert on 320nm and be swashed
Light output.
In an embodiment of the present invention collimating mirror 2 be focal length be 35mm convex lens, be coated with 515nm-565nm high thoroughly
Film is used as collimating mirror in device；Focus lamp 3 is that the convex lens that focal length is 75mm is coated with the saturating films of 532nm high, is used as in device poly-
Jiao Jing.Er:YAP crystal is plated with corresponding membrane system, close to the Er of focus lamp 3:YAlO3Crystal, close to 3 end of focus lamp
Er:YAlO3Crystal end-face is coated with the film that 515nm-565nm high is saturating, 310-330nm high is anti-, another end face of this crystal is coated with
515nm-565nm, 310-330nm high saturating film；Another piece of Er:YAlO3Crystal, the Er close to 3 end of focus lamp:YAlO3Crystal terminal
Face is coated with the saturating film of 515nm-565nm, 310-330nm high, another end face is coated with the film that 310-330nm transmitances are 1%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (4)
- A kind of 1. method of two steps excitation continuous wave ultraviolet laser, which is characterized in that two step excites continuous wave ultraviolet laser The method of device includes：First, output wavelength becomes directional light, directional light for the output laser of 532nm frequency double lasers after collimating mirror collimates By focus lamp to Er:YAP crystal is close to the Er of focus lamp side:YAlO3At the center of crystal end-face, Er:YAlO3In crystal Er3+Pump light is absorbed, Er:YAlO3Ground state is in crystal4I15/2Er on energy level3+Excitation reaches2H11/2Energy level, it is described Er:YAP crystal includes two Er:YAlO3Crystal, close to focus lamp end Er:YAlO3Be coated on the end face of crystal 515nm~ The film of 565nm high-transmission rates, 310nm~330nm high reflectances, another end face be coated with 515nm~565nm, 310nm~ The film of 330nm high-transmission rates, another piece of Er:YAlO3Crystal is coated with 515nm~565nm, 310nm close to the end face at focus lamp end The film of~330nm high-transmission rates, another end face are coated with the film that 310nm~330nm transmissivities are 1%；Secondly, it is in2H11/2The Er of energy level3+Pump light is further absorbed, is in2H11/2The Er of energy level3+It transits to2P3/2Energy level, With2P3/2The Er of energy level3+Increase,2P3/2The Er of energy level3+Accumulation, realizes population inversion and 320nm up-conversion lasings is defeated Go out.
- 2. the method for two steps excitation continuous wave ultraviolet laser as described in claim 1, which is characterized in that in laserresonator Under the action of, the laser of 320nm forms oscillation in the resonator of laser, realizes the output of 320nm switched lasers.
- 3. the method for two step as described in claim 1 excitation continuous wave ultraviolet laser, which is characterized in that the collimating mirror is Focal length is the planoconvex spotlight of 35mm, and two sides is coated with the film of 515nm~565nm high-transmission rates.
- 4. the method for two step as described in claim 1 excitation continuous wave ultraviolet laser, which is characterized in that the focus lamp is Focal length is that the planoconvex spotlight of 75mm is coated with the film of 532nm high-transmission rates.
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| CN201510210144.4A CN106207732B (en) | 2015-04-29 | 2015-04-29 | A kind of method of two steps excitation continuous wave ultraviolet laser |
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| CN201510210144.4A CN106207732B (en) | 2015-04-29 | 2015-04-29 | A kind of method of two steps excitation continuous wave ultraviolet laser |
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| CN109149340A (en) * | 2018-08-16 | 2019-01-04 | 海南师范大学 | It is a kind of can generation wavelength be 228nm deep ultraviolet full solid laser device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682397A (en) * | 1994-09-01 | 1997-10-28 | The United States Of America As Represented By The Secretary Of The Navy | Er:YALO upconversion laser |
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2015
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682397A (en) * | 1994-09-01 | 1997-10-28 | The United States Of America As Represented By The Secretary Of The Navy | Er:YALO upconversion laser |
Non-Patent Citations (5)
| Title |
|---|
| Cooperative and charge transfer luminescence in Yb3+-doped yttrium aluminum perovskite (YAlO3);Yongjun Dong et al.;《Journal of Crystal Growth》;20061231;第289卷;676–680 * |
| Photon Avalanche Upconversion in Er3+:YA103;Richard Scheps;《IEEE JOURNAL OF QUANTUM ELECTRONICS》;19950228;第31卷(第2期);309-316 * |
| Ultraviolet and violet upconversion luminescence in Er3+-doped yttrium aluminum garnet crystals;Huailiang Xu et al.;《PHYSICAL REVIEW B》;20020703;第66卷;035103-1至035103-5 * |
| Upconversion in Er3+:YA103 produced by metastable state absorption;Richard Scheps;《Optical Materials》;19970331;第7卷;75-88 * |
| UPCONVERSION LASER PROCESSES;RICHARD SCHEPS;《Prog. Quant. Electr.》;19961231;第20卷(第4期);271-358 * |
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