CN1268045C - Uppor conversion self sum frequency UV laser - Google Patents
Uppor conversion self sum frequency UV laser Download PDFInfo
- Publication number
- CN1268045C CN1268045C CN 02120548 CN02120548A CN1268045C CN 1268045 C CN1268045 C CN 1268045C CN 02120548 CN02120548 CN 02120548 CN 02120548 A CN02120548 A CN 02120548A CN 1268045 C CN1268045 C CN 1268045C
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- CN
- China
- Prior art keywords
- laser
- crystal
- conversion
- frequency
- ultraviolet
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- Expired - Fee Related
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The present invention relates to an ultraviolet laser device with up conversion and self frequency summation, which relates to the design field of laser crystals and solid laser devices. Two end surfaces of a nonlinear laser crystal with frequency up-conversion are cut along a phase matching direction which is perpendicular to a frequency summing fundamental wave laser and a pumping laser, and form a solid laser device with a corresponding plated film sheet. Ultraviolet lasers are output by utilizing infrared laser pumping. The device is composed of a piece of up-conversion nonlinear laser crystal and a pair of laser cavity mirrors, and has the advantages of simple and compact structure, and high stability and reliability.
Description
Technical field
The present invention relates to laser crystal and solid state laser design field.
Background technology
Solid state laser has advantages such as beam quality height, reliable and stable, the long service life of running.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 crystal, 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.
Summary of the invention
The present invention design a kind of infrared laser pumping, by single crystal constitute go up conversion from and ultraviolet laser frequently, infrared laser is transformed into the output of ultraviolet Solid State Laser effectively.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 crystal that this solid ultraviolet laser adopts is, doping can produce the nonlinear optical crystal of the rare earth ion of frequency up-conversion lasing as active ions, this crystalloid has nonlinear optical effect and passes through the dual-use function that processes such as excited state absorption or energy delivery produce the frequency up-conversion lasing, can be referred to as the conversion non-linear laser crystal.For example: at present existing nonlinear optical crystal Gd
xY
1-xAl
3(BO
3)
4, Ca
4Gd
xY
1-xO (BO
3)
3, Gd
2xY
2 (1-x)(MoO
4)
3, (wherein x can change to 1 from 0), LaSc
3(BO
3)
4In, with rare earth ion such as Pr
3+, Ho
3+, Er
3+, Tm
3+Deng, as all or part of replacement of active ions Gd
3+, Y
3+Or La
3+Ion.Perhaps other can be by rare-earth ion activated nonlinear optical crystal, as RE
3+: MgO:LiNbO
3, RE
3+: ZnO:LiNbO
3(rare earth ions such as RE=Pr, Ho, Er, Tm) etc.
With the both ends of the surface of last conversion non-linear laser crystal, along perpendicular to the phase matched direction cutting of frequently going up the conversion fundamental wave of laser, and constitute solid state laser with corresponding plated film sheet.
This solid ultraviolet laser adopts infrared laser to carry out end 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, the Ultra-Violet Laser that the nonlinear optical effect of utilizing non-linear laser crystal self to have is again exported high light beam quality with the infrared laser and the frequency of this fundamental wave of laser and pumping.Former this device that claims is oneself and a frequency laser of last conversion.
The present invention program's implementation now is described in conjunction with the accompanying drawings:
At first, according to the situation of infrared pumping laser and the requirement of shoot laser, select suitable rare earth ion as active ions and suitable nonlinear optical crystal as host crystal, last conversion non-linear laser crystal growth.Basis and frequency needs carry out the orientation cutting to last conversion non-linear laser crystal (1) again, make its incident vertical with required phase matched direction with the outgoing end face, the length of crystal can be determined (generally millimeter 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.The laser cavity that afterwards this crystal is placed the medium diaphragm (2) of two suitable laser operations and (3) to constitute, be one be suitable for infrared laser along the single crystal of direction (4) pumping from and ultraviolet laser frequently, along direction (5) output Ultra-Violet Laser.
Can be in last conversion non-linear laser crystal 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.At the last anti-reflection film of changing both ends of the surface plating pump light, fundamental wave and the ultraviolet light of non-linear laser crystal, can improve laser operation efficient.
Directly at the both ends of the surface plated film of last conversion non-linear laser crystal, 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:
Adopt the infrared light pumping Ultra-Violet Laser system of two blocks of above nonlinear optical crystals to compare with existing the needs, the present invention is exportable Ultra-Violet Laser by the laser that single upward conversion non-linear laser crystal constitutes 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.
Description of drawings
Accompanying drawing be a kind of go up conversion from and the schematic diagram of ultraviolet laser frequently, wherein (1) is to go up the conversion non-linear laser crystal, its end face along perpendicular to go up the conversion fundamental wave of laser frequently and cut with the phase matched direction of infrared pumping laser; (2) be the incident plated film chamber mirror of laser cavity; (3) be the outgoing plated film chamber mirror of laser cavity; (4) be infrared pumping laser incident direction; (5) be the Ultra-Violet Laser exit direction.
Embodiment
The infrared pumping laser and the Er of example 1:800 nano wave length
3+Change on 670 nanometers that ion produces fundamental wave of laser (
4F
9/2→
4I
15/2) and produce the output of 365 nanometer Ultra-Violet Lasers frequently.Last conversion non-linear laser crystal Er
xY
1-xCa
4O (BO
3)
3(x is between 0.001 to 1) both ends of the surface are along perpendicular to I class phase matching angle θ=90.0 °, φ=79.4 ° directed cutting, the size of determining crystal simultaneously (is generally end area and arrives square centimeter at square millimeter, length is square column or the cylinder between several millimeters to tens centimetres), the end face polishing is placed in the laser cavity.Incident plated film chamber mirror (2) is high saturating at 800 nano wave length places, 670 nanometers and 365 nanometers high anti-(R＞99%), and outgoing plated film chamber mirror (3) is high saturating in 800 nanometers and 670 nanometers high anti-(R＞99%), 365 nanometers.This be one be suitable for 800 nanometer infrared laser pumps along direction (4) pumping go up conversion from and ultraviolet laser frequently, along the Ultra-Violet Laser of direction (5) output 365 nano wave lengths.
Example 2: use Er
x(Gd
yY
1-y)
1-xCa
4O (BO
3)
3Er in (x is between 0.001 to 1, and y is between 0 to 1) alternate example 1
xY
1-xCa
4O (BO
3)
3(x is between 0.001 to 1) is as last conversion non-linear laser crystal, both ends of the surface along perpendicular to I class phase matching angle (along with y changes to 1 from 0, matching angle may depart from θ=90.0 °, φ=79.4 °) directed cutting, also can adopt way structure in the example 1 be suitable near infrared laser pump 800 nanometers along direction (4) pumping go up conversion from and ultraviolet laser frequently, along near the Ultra-Violet Laser of wavelength direction (5) output 365 nanometers.
Example 3: can utilize other nonlinear optical crystals such as LaSc
3(BO
3)
4, RE
3+: MgO:LiNbO
3, RE
3+: ZnO:LiNbO
3, Gd
xY
1-xAl
3(BO
3)
4And Gd
2xY
2 (1-x)(MoO
4)
3(wherein x can change to 1 from 0) arrives doping with rare-earth ions such as Pr in a hundred per cent molar concentration scope 0. 1 percent
3+, Ho
3+, Er
3+, Tm
3+Deng, determine corresponding infrared pumping laser wavelength according to the absorption spectra of rare earth ion, according to last conversion non-linear laser crystal being carried out the orientation cutting from phase-matching condition with frequency, only otherwise because of last conversion non-linear laser crystal causes laser to turn round to last conversion fundamental wave of laser and ultraviolet from the self-absorption with frequency laser, all can with reference to example 1 textural conversion from and the frequency ultraviolet laser.Infrared laser is along direction (4) pumping, and last conversion is from exporting along direction (5) with the frequency Ultra-Violet Laser.
Example 4: from example 1 to example 3, all can be in last conversion non-linear laser crystal one of doping percentage to the sensitized ions such as the Yb of 99 percent molar concentration
3+Deng to strengthen absorption, improve laser operation efficient to pump light.
Example 5: from example 1 to example 4, all can be at the anti-reflection film of both ends of the surface plating pump light, fundamental wave and the ultraviolet light of last conversion non-linear laser crystal to improve laser operation efficient.
Example 6: from example 1 to example 4, all can be directly constitute a laser that does not have incident chamber mirror and outgoing chamber mirror but have identical function at the both ends of the surface plated film of last conversion non-linear laser crystal.
Claims (5)
1, a kind of go up conversion from and ultraviolet laser frequently, by infrared laser pumping system, laser cavity with go up the conversion non-linear laser crystal and forms, it is characterized in that: only go up in the laser cavity and change non-linear laser crystal, this non-linear laser crystal employing LaSc with one
3(BO
3)
4Or Gd
xY
1-xAl
3(BO
3)
4Or Ca
4Gd
xY
1-xO (BO
3)
3Or Gd
2xY
2 (1-x)(MoO
4)
3, 0＜x≤1 wherein; With rare earth ion Pr
3+, Ho
3+, Er
3+Or Tm
3+, as all or part of replacement of active ions Gd
3+, Y
3+Or La
3+Ion; Perhaps adopt other can be by rare-earth ion activated nonlinear optical crystal RE
3+: MgO:LiNbO
3Or RE
3+: ZnO:LiNbO
3, wherein RE is Pr, Ho, Er or Tm rare earth ion; This laser adopts infrared laser to carry out end 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, the nonlinear optical effect of utilizing non-linear laser crystal self to have is again exported Ultra-Violet Laser with the infrared laser and the frequency of this fundamental wave of laser and pumping.
2, a kind of upward the conversion certainly and the frequency ultraviolet laser as claimed in claim 1, it is characterized in that: described going up changed non-linear laser crystal, and its both ends of the surface edge is perpendicular to cutting with phase matched direction frequently certainly.
3, a kind of going up as claimed in claim 1 changed certainly and the frequency ultraviolet laser, it is characterized in that: one of doping percentage is to the sensitized ions Yb of 99 percent molar concentration in the described upward conversion non-linear laser crystal
3+
4, a kind of going up as claimed in claim 1 changed certainly and the frequency ultraviolet laser, and it is characterized in that: the described both ends of the surface that go up the conversion non-linear laser crystal are plated the anti-reflection film of pump light, fundamental wave and ultraviolet light.
5, going up of a kind of claim 1 changed certainly and the frequency ultraviolet laser, it is characterized in that: directly at the both ends of the surface plated film of last conversion non-linear laser crystal, constitute a ultraviolet laser that does not have incident chamber mirror and outgoing chamber mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02120548 CN1268045C (en) | 2002-05-28 | 2002-05-28 | Uppor conversion self sum frequency UV laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02120548 CN1268045C (en) | 2002-05-28 | 2002-05-28 | Uppor conversion self sum frequency UV laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1462096A CN1462096A (en) | 2003-12-17 |
| CN1268045C true CN1268045C (en) | 2006-08-02 |
Family
ID=29742482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02120548 Expired - Fee Related CN1268045C (en) | 2002-05-28 | 2002-05-28 | Uppor conversion self sum frequency UV laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1268045C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675717B (en) * | 2020-05-14 | 2023-03-14 | 香港理工大学深圳研究院 | Up-conversion excitation unit and laser thereof |
-
2002
- 2002-05-28 CN CN 02120548 patent/CN1268045C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1462096A (en) | 2003-12-17 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060802 Termination date: 20130528 |