CN1464599A - Up conversion intracavity sum frequency ultraviolet laser - Google Patents
Up conversion intracavity sum frequency ultraviolet laser Download PDFInfo
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- CN1464599A CN1464599A CN 02124624 CN02124624A CN1464599A CN 1464599 A CN1464599 A CN 1464599A CN 02124624 CN02124624 CN 02124624 CN 02124624 A CN02124624 A CN 02124624A CN 1464599 A CN1464599 A CN 1464599A
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Abstract
A sum frequency UV laser in upconversion intracavity is characterized by that parts of intracavity sum frequency upconversion principal wave laserparts are designed and iraser is utilized to output ultraviolet laser, consisting of a piece of laser medium, a piece of nonlinear optical crystal and a pair of laser cavity mirror. It provides simple and compacted structure as well as high stability and reliability.
Description
A kind of going up in the conversion chamber relates to the solid state laser design field with the frequency ultraviolet laser.
A kind ofly go up in the conversion chamber and ultraviolet laser frequently, advantages such as solid state laser has the beam quality height, it is reliable and stable to turn round, long service life.Calculate and the extensive use in field such as spectral measurement along with the development of laser technology and at information stores, photometry, short wavelength's Solid State Laser particularly ultraviolet Solid Laser Elements causes people's attention day by day.Existing solid Ultra-Violet Laser generally adopts the infrared semiconductor laser pumping output wavelength solid fundamental wave of laser longer than this semiconductor laser, just can obtain through at least twice frequency multiplication or with the frequency process again.Except a laser medium, also need to adopt the nonlinear optical crystal more than two in its Laser Devices.This just makes device architecture very complicated, the price comparison costliness.Need in the use often device for non-linear optical wherein to be adjusted and proofreaied and correct, maintenance cost is higher, and stability and reliability are all poor,, can't use in a lot of fields also than higher the requirement of environment for use.Though conversion is from making the compactedness of device reach ultimate attainment with the frequency scheme in the employing, but non-linear laser crystal often exists the self-absorption to Ultra-Violet Laser, retrained the running efficiency and the outgoing wave-length coverage of device, up-conversion lasing performance and non-linear optical property all preferably crystalline material also be more difficult to get.This programme adopts the frequency up-conversion laser crystal to make the wavelength of fundamental wave of laser be shorter than the infrared laser wavelength of pumping, utilize nonlinear optical crystal with this fundamental wave of laser and infrared frequency multiplication laser and the Ultra-Violet Laser of exporting high light beam quality frequently again, can make the output area of Ultra-Violet Laser bigger, running efficiency is higher.
A kind of go up in the conversion chamber and an infrared laser pumping of ultraviolet laser design frequently by laser medium and the ultraviolet solid state laser that nonlinear optical crystal constitutes, infrared laser is transformed into the ultraviolet Solid State Laser effectively exports.Purpose be to solve current by infrared laser pumping output ultraviolet Solid State Laser need adopt laser system complex structure that a series of device for non-linear optical brings, difficult in maintenance, problem such as cost an arm and a leg, make device try one's best compactness and miniaturization, improve operation stability simultaneously, reduce device cost.
The present invention adopts following technical scheme:
The laser medium that this solid ultraviolet laser adopts is for can being produced the rare earth ion of frequency up-conversion lasing, as Pr
3+, Nd
3+, Ho
3+, Er
3+, Tm
3+Etc. rare earth ion doped YAlO
3, LiYF
4, YAG, LaF
3In crystal, the doping content of rare earth ion is at 0.5at.%～30at.%; Mix the fluoride glass of above-mentioned ion and transparent ceramic etc., the doping content of rare earth ion is at 0.5at.%～30at.%.Such laser medium can be referred to as frequency up-conversion lasing medium.Adopt nonlinear optical crystal (as KTP, LBO, BBO, KNbO
3Deng) carry out in the chamber and frequency to last conversion fundamental wave of laser and infrared pumping laser.And constitute solid state laser with corresponding plated film sheet.
This solid ultraviolet laser adopts the infrared laser pumping.Make the wavelength of fundamental wave of laser be shorter than the infrared laser wavelength of pumping through transfer process on the frequency of active ions, utilize nonlinear optical crystal again this fundamental wave of laser and infrared pumping laser and the Ultra-Violet Laser of exporting high light beam quality frequently.So claim that this device is in the last conversion chamber and the frequency ultraviolet laser.
A kind of go up in the conversion chamber and the structure of frequency ultraviolet laser as shown in drawings, wherein (1) is frequency up-conversion lasing medium; (2) be nonlinear optical crystal; (3) be incident plated film chamber mirror; (4) be outgoing plated film chamber mirror; (5) be infrared pumping laser incident direction; (6) be the Ultra-Violet Laser exit direction.
The present invention program's implementation now is described in conjunction with the accompanying drawings:
At first,, select suitable rare earth ion to prepare the up-conversion lasing medium, medium is cut with end face polish again as active ions according to the requirement of shoot laser wavelength.The length of frequency up-conversion lasing medium (1) can be determined (generally hundreds of micron to tens centimetre between) according to the requirement of concrete material and device, and end area is generally square between the centimeter square at millimeter.According to nonlinear optical crystal (2) being carried out the orientation cutting with the phase matched needs of going up conversion fundamental wave of laser and infrared pumping laser frequently, make its incident vertical with required phase matched direction with the outgoing end face, the length of crystal can be determined (generally between several millimeters to several centimetres) according to the requirement of concrete material and device, and end area is generally square between the centimeter square at millimeter.Place two to be fit to upward to change in the chamber and the laser cavity of the incident plated film chamber mirror (3) of Ultra-Violet Laser running frequently and outgoing plated film chamber mirror (4) formation laser medium and nonlinear optical crystal afterwards.The position of the two can exchange as the case may be, to reach best output effect.This be one be suitable for infrared laser along direction (5) pumping go up in the conversion chamber and ultraviolet laser frequently, export Ultra-Violet Laser along direction (6).
Can be in the up-conversion lasing medium one of doping percentage to the sensitized ions of 99 percent molar concentration, as Yb
3+Deng, to strengthen absorption, improve laser operation efficient to pump light.Anti-reflection film at the both ends of the surface of up-conversion lasing medium and nonlinear optical crystal plating pump light, fundamental wave and ultraviolet light can improve laser operation efficient.
Be fit in the conversion chamber and the deielectric-coating of Ultra-Violet Laser running frequently at the up-conversion lasing medium of the most close incident and outgoing chamber mirror or the end face plating of nonlinear optical crystal, replace incident plated film chamber mirror (3) and outgoing plated film chamber mirror (4), can directly constitute one does not have incident chamber mirror and outgoing chamber mirror, but has the laser of identical function.
The useful effect that enforcement the present invention has is as follows:
Need to adopt the infrared laser pumping Ultra-Violet Laser system of two blocks of above nonlinear optical crystals to compare with existing, the present invention is exportable Ultra-Violet Laser by the laser that a frequency up-conversion lasing medium and nonlinear optical crystal constitute through the infrared laser pumping.The invention enables the Ultra-Violet Laser device compact more, overcome the complexity of device manufacturing, maintenance, adjustment, reduced manufacturing and maintenance cost, improved stability and the reliability of running, be convenient to use under the various environmental conditions, will further expand the application of Ultra-Violet Laser.
As follows in a kind of upward conversion chamber with the embodiment of frequency ultraviolet laser:
Pr is mixed in the infrared laser pumping of example 1:860nm wavelength
3+The last conversion of frequency up-conversion lasing medium generation 635nm fundamental wave of laser (
3P
0→
3F
2), produce the output of 365nm Ultra-Violet Laser with frequency in the chamber again.Laser structure as shown in drawings.Be coated with deielectric-coating on the incident plated film chamber mirror (3), near fundamental wave of laser 635nm high anti-(R＞99%), high saturating near infrared pumping laser 860nm.Be coated with deielectric-coating on the outgoing plated film chamber mirror (4), near 860nm and 635nm high anti-(R＞99.9%), transmitance is greater than 75% near 365nm.Frequency up-conversion lasing medium (1) is with Pr
3+Be active ions, Yb
3+Be the fluoride glass of sensitized ions, be generally end area 5 * 5mm
2Square column or the cylinder of φ=5mm, length is about 1cm, end face polishing is placed in the laser cavity.Nonlinear optical crystal (2) be both ends of the surface along perpendicular to the bbo crystal of I class phase matching angle θ=37.75 ° of cuttings of frequency 635nm fundamental wave of laser and the infrared pumping laser of 860nm, crystal length is generally 5mm to 1cm, end area is generally 5 * 5mm
2This be one be suitable for the 860nm infrared laser along direction (5) pumping go up in the conversion chamber and ultraviolet laser frequently, export the Ultra-Violet Laser of 365nm wavelength along direction (6).
Example 2: with reference to example 1, Er is mixed in the infrared laser pumping of 810nm wavelength
3+Frequency up-conversion laser crystal LiYF
4(1) produce 551nm go up the conversion fundamental wave of laser (
4S
3/2→
4I
15/2), produce the output of 328nm Ultra-Violet Laser with frequency in the chamber again.Laser structure as shown in drawings.Be coated with deielectric-coating on the incident plated film chamber mirror (3), near fundamental wave of laser 551nm high anti-(R＞99%), high saturating near infrared pumping laser 810nm.Be coated with deielectric-coating on the outgoing plated film chamber mirror (4), near 810nm and 551nm high anti-(R＞99.9%), transmitance is greater than 75% near 328nm.Nonlinear optical crystal (2) be both ends of the surface along perpendicular to the bbo crystal of I class phase matching angle θ=35.59 ° of cuttings of frequency 551nm fundamental wave of laser and the infrared pumping laser of 810nm.This be one be suitable for the 810nm infrared laser along direction (5) pumping go up in the conversion chamber and ultraviolet laser frequently, export the Ultra-Violet Laser of 328nm wavelength along direction (6).
Example 3: with reference to example 1, Tm is mixed in the infrared laser pumping of 1120nm wavelength
3+The last conversion of fluoride glass (1) generation 480nm fundamental wave of laser (
1G
4→
3H
6), produce the output of 336nm Ultra-Violet Laser with frequency in the chamber again.Laser structure as shown in drawings.Be coated with deielectric-coating on the incident plated film chamber mirror (3), near fundamental wave of laser 480nm high anti-(R＞99%), high saturating near infrared pumping laser 1120nm.Be coated with deielectric-coating on the outgoing plated film chamber mirror (4), near 1120nm and 480nm high anti-(R＞99.9%), transmitance is greater than 75% near 336nm.Nonlinear optical crystal (2) be both ends of the surface along perpendicular to the bbo crystal of I class phase matching angle θ=32.29 ° of cuttings of frequency 480nm fundamental wave of laser and the infrared pumping laser of 1120nm.This be one be suitable for the 1120nm infrared laser along direction (5) pumping go up in the conversion chamber and ultraviolet laser frequently, export the Ultra-Violet Laser of 336nm wavelength along direction (6).
Claims (6)
- One kind go up in the conversion chamber and frequently ultraviolet laser form by infrared laser pumping system, laser cavity, frequency up-conversion lasing medium and nonlinear optical crystal, it is characterized in that: in the laser cavity with a frequency up-conversion lasing medium (1) and a nonlinear optical crystal (2); Frequency up-conversion lasing medium is doping Pr 3+, Nd 3+, Ho 3+, Er 3+Or Tm 3+The YAlO of rare earth ion 3, LiYF 4, YAG or LaF 3A kind of in the crystal, the doping content of rare earth ion is at 0.5at.%～30at.%; Perhaps be doping Pr 3+, Nd 3+, Ho 3+, Er 3+Or Tm 3+The fluoride glass of rare earth ion or transparent ceramic, the doping content of rare earth ion is at 0.5at.%～30at.%; Nonlinear optical crystal is KTP, LBO, BBO or KNbO 3A kind of in the crystal.
- 2. a kind of going up as claimed in claim 1 changed in the chamber and the frequency ultraviolet laser, it is characterized in that: to described nonlinear optical crystal, according to carrying out the orientation cutting with the phase matched needs of going up conversion fundamental wave of laser and infrared pumping laser frequently, make its incident vertical with required phase matched direction with the outgoing end face, the length of crystal can determine that end area is square between the centimeter square at millimeter according to the requirement of concrete material and device.
- 3. a kind of going up as claimed in claim 1 changed in the chamber and the frequency ultraviolet laser, and it is characterized in that: one of doping percentage is to the sensitized ions Yb of 99 percent molar concentration in described frequency up-conversion lasing medium 3+
- 4. a kind of going up as claimed in claim 1 changed in the chamber and the frequency ultraviolet laser, it is characterized in that: the anti-reflection film that plates pump light, fundamental wave and ultraviolet light in the both ends of the surface of described frequency up-conversion lasing medium and nonlinear optical crystal.
- 5. a kind of going up as claimed in claim 1 changed in the chamber and the frequency ultraviolet laser, it is characterized in that: a described frequency up-conversion lasing medium (1) and a nonlinear optical crystal (2), the location swap of the two.
- 6. a claim 1 goes up in the conversion chamber and the frequency ultraviolet laser, it is characterized in that: be fit in the conversion chamber and the deielectric-coating of Ultra-Violet Laser running frequently at the frequency up-conversion lasing medium of the most close incident plated film chamber mirror and outgoing plated film chamber mirror and the end face plating of nonlinear optical crystal, directly constitute a laser that does not have incident chamber mirror and outgoing chamber mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02124624 CN1464599A (en) | 2002-06-20 | 2002-06-20 | Up conversion intracavity sum frequency ultraviolet laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02124624 CN1464599A (en) | 2002-06-20 | 2002-06-20 | Up conversion intracavity sum frequency ultraviolet laser |
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| Publication Number | Publication Date |
|---|---|
| CN1464599A true CN1464599A (en) | 2003-12-31 |
Family
ID=29743860
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02124624 Pending CN1464599A (en) | 2002-06-20 | 2002-06-20 | Up conversion intracavity sum frequency ultraviolet laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102551884A (en) * | 2012-02-10 | 2012-07-11 | 北京天助畅运医疗技术股份有限公司 | Ultrasonic imaging microwave therapeutic instrument |
-
2002
- 2002-06-20 CN CN 02124624 patent/CN1464599A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102551884A (en) * | 2012-02-10 | 2012-07-11 | 北京天助畅运医疗技术股份有限公司 | Ultrasonic imaging microwave therapeutic instrument |
| CN102551884B (en) * | 2012-02-10 | 2014-12-17 | 北京天助畅运医疗技术股份有限公司 | Ultrasonic imaging microwave therapeutic instrument |
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