CN201860030U - Self-stimulated Raman sum frequency laser wavelength converting device with compact structure - Google Patents
Self-stimulated Raman sum frequency laser wavelength converting device with compact structure Download PDFInfo
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- CN201860030U CN201860030U CN2010206135781U CN201020613578U CN201860030U CN 201860030 U CN201860030 U CN 201860030U CN 2010206135781 U CN2010206135781 U CN 2010206135781U CN 201020613578 U CN201020613578 U CN 201020613578U CN 201860030 U CN201860030 U CN 201860030U
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Abstract
The utility model discloses a self-stimulated Raman sum frequency laser wavelength converting device with a compact structure, which comprises a public resonant cavity. The public resonant cavity comprises a shared resonant cavity mirror and a shared output coupling mirror, wherein self-stimulated Raman scattering medium and a nonlinear sum frequency crystal are sequentially arranged between the shared resonant cavity mirror and the shared output coupling mirror. The device can effectively increase the quantity of usable singlet laser wavelengths.
Description
Technical Field
The utility model relates to a laser wavelength dress trades device, specificly relates to a compact structure's stimulated raman sum frequency laser wavelength conversion equipment.
Background
Generally, the output laser wavelength of the solid laser comes from the energy level transition of the laser material, the number of solid laser materials which can be practically used is not large, and each solid laser material only has a few available laser transition spectral lines, so that the practical single spectral line wavelength cannot meet the increasing demand.
With the research and development of nonlinear optical frequency conversion technology and corresponding nonlinear optical crystal, the nonlinear optical frequency conversion technology can convert the wavelength from the energy level transition of the laser crystal into a new laser wavelength, and the technologies are respectively called nonlinear optical frequency doubling, sum frequency, difference frequency, optical parametric conversion and the like. In nonlinear optics and sum frequency technology, the most common laser light of two different wavelengths participating in sum frequency is from energy level transition of laser material, for example, the two sub-resonators of U.S. patent No.5.345.457 generate two fundamental frequency light of 1064nm and 1318nm, respectively, through energy level transition of two laser crystals, and the two fundamental frequency light beams generate 589nm wavelength output through the sum frequency crystal at the common coincidence part of the resonator. Similar domestic technology has granted utility model patent No. 200410010917.6, which proposes a folded cavity structure with sum frequency in the cavity. There are also U.S. patent nos.: US20040125834a1, which is a technique in which two different wavelengths of fundamental light, referred to as sum frequencies, are obtained from a quasi-three level transition of a solid laser material, and the other from a four level transition of the solid laser material.
Another method of laser frequency conversion is a stimulated raman scattering technique, which converts fundamental frequency light incident on and passing through a raman scattering medium into laser light of a new wavelength by frequency shift caused by stimulated raman scattering of the raman scattering medium. The laser with the new wavelength can be converted into laser with another wavelength by the nonlinear optical frequency doubling technology. Chinese patent applications for such frequency doubling technology of raman laser are 200810138022.9 and 200720029555.4, respectively.
SUMMERY OF THE UTILITY MODEL
The utility model aims at combining above background art, providing a compact structure's stimulated raman sum frequency laser wavelength conversion equipment, further widen usable single spectral line laser wavelength quantity.
In order to solve the technical problem, the above object is achieved, the utility model discloses a following technical scheme realizes:
a self-stimulated Raman scattering medium and a nonlinear sum frequency crystal are sequentially arranged between the common resonant cavity mirror and the common output coupling mirror.
Preferably, a new self-excited raman scattering medium is formed by preparing the related film system sharing the resonator cavity mirror on the input surface of the self-excited raman scattering medium, so as to eliminate a separate lens, wherein the surface of the new self-excited raman scattering medium can be a concave surface, a plane surface or a convex surface.
The utility model discloses a compact structure's stimulated raman sum frequency laser wavelength conversion equipment's theory of operation as follows:
when the self-excited Raman scattering medium in the common resonant cavity is pumped by the pump light emitted by the external light source, transition wavelengths λ are respectively generated at different energy levels of the self-excited Raman scattering medium0And the second wavelength is lambda2Laser energy level transition laser. Wherein the wavelength is λ0Is oscillated in a common resonant cavity, and the second wavelength is lambda2Also propagating oscillation within the common resonant cavity. The wavelength is lambda0When the laser beam passes through the self-stimulated Raman scattering medium, the wavelength is lambda due to the stimulated Raman scattering effect0Produces a first wavelength lambda1And still propagating the oscillation within the common resonator. When the first wavelength is lambda1The stimulated Raman shift laser beam and the second wavelength are lambda2When laser beams are simultaneously incident and pass through the nonlinear sum frequency crystal, the nonlinear sum frequency crystal is used for carrying out laser energy level transitionInteraction, resulting in a wavelength λ different from the first wavelength1And the second wavelength is lambda2Of a new third wavelength of3And output by a common output coupling mirror.
Wherein, said λ1、λ2And λ3Should satisfy the sum frequency relation 1/lambda3＝1/λ2+1/λ1. The nonlinear sum frequency crystal needs to be at the lambda1And λ2Is cut in a phase matching direction of the nonlinear sum frequency interaction such that said λ2、λ3And λ1Satisfy the phase matching relation when propagating in the nonlinear sum frequency crystalWherein,and
are all vectors and are respectively said wavelength λ1Stimulated Raman shift laser of wavelength lambda2Laser energy level transition laser and wavelength of lambda3The sum frequency laser light has a refractive index as it propagates in the nonlinear sum frequency crystal.
Through the application of above-mentioned technique, the utility model discloses a compact structure's stimulated raman sum frequency laser wavelength conversion equipment can effectively widen usable single spectral line laser wavelength quantity.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic structural diagram of an embodiment of the stimulated raman sum frequency laser wavelength conversion device with a compact structure according to the present invention.
Fig. 2 is a schematic diagram of a further improved structure of the embodiment disclosed in fig. 1.
The reference numbers in the figures illustrate: 1. the self-excited Raman scattering medium comprises a shared resonant cavity mirror, 2 self-excited Raman scattering medium, 3 nonlinear sum frequency crystal, 4 shared output coupling mirror and 5 novel self-excited Raman scattering medium.
Detailed Description
Example 1:
referring to fig. 1, a stimulated raman sum frequency laser wavelength conversion device with a compact structure includes a common resonant cavity, where the common resonant cavity includes a common resonant cavity mirror 1 and a common output coupling mirror 4, and a self-stimulated raman scattering medium 2 and a nonlinear sum frequency crystal 3 are sequentially disposed between the common resonant cavity mirror 1 and the common output coupling mirror 4.
Preferably, referring to fig. 2, a new self-excited raman scattering medium 5 is formed by preparing the relevant film system of the common resonator cavity mirror 1 on the input surface of the self-excited raman scattering medium 2, thereby eliminating a separate lens, wherein the surface of the new self-excited raman scattering medium 5 can be a concave surface, a plane surface or a convex surface.
The invention is described in further detail below in a preferred embodiment:
GdVO4 self-excited Raman crystal, the surface of which opposite to the nonlinear sum frequency crystal 3 can be a plane or a curved surface, is adopted by the novel self-excited Raman scattering medium 5, the reflectivity of light beams with the wavelengths of 1064nm, 1342nm and 1175nm is more than 99.5%, the transmittance of light beams with the wavelengths of 808nm is more than 90%, and an antireflection film with the transmittance of light beams with the wavelengths of 1064nm, 1342nm and 1175nm is more than 99% is prepared on the other side.
Furthermore, the nonlinear sum frequency crystal 3 adopts a nonlinear sum frequency crystal such as LBO, BiBO, KTP or KTA and the like, cutting is carried out according to the phase matching direction of the wavelength of 1342nm and the wavelength of 1175nm sum frequency generation 626nm, and antireflection films for light beams with four wavelengths such as 1064nm, 1342nm, 1175nm and 626nm are prepared on two light passing surfaces of the nonlinear sum frequency crystal 3.
Furthermore, the surface film system close to the nonlinear sum frequency crystal 3 of the common output coupling mirror 4 is a multilayer dielectric film which is required to have the reflectivity of more than 99.5% for light beams with the wavelengths of 1064nm, 1342nm and 1175nm, an antireflection film with the transmissivity of more than 90% for the light beam with the wavelength of 626nm, and an antireflection film with the transmissivity of more than 99% for the light beam with the wavelength of 626nm is prepared on the other surface.
When the Nd: GdVO4 crystal in the Raman resonant cavity is pumped by an external light source, laser transition with the wavelength of 1064nm and 1342nm is generated, when a laser beam with the wavelength of 1064nm passes through the Nd: GdVO4 crystal, the laser with the wavelength of 1175nm is generated by frequency shifting the laser with the wavelength of 1064nm due to the stimulated Raman scattering effect, and the laser with the wavelength of 1064nm and 1342nm simultaneously propagate and oscillate in the common resonant cavity; since the nonlinear sum frequency crystal 3 is cut in the phase matching direction of 1342nm and 1175nm wavelength sum frequency generation 626nm wavelength, when the laser light with 1342nm and 1175nm wavelength is simultaneously incident and passes through the nonlinear sum frequency crystal 3, the sum frequency laser light with 626nm wavelength is generated due to the nonlinear optical sum frequency interaction and is output by the common output coupling mirror 4.
Example 2:
this embodiment has a structure similar to that of embodiment 1 except that the novel self-excited Raman scattering medium 5 uses laser transition lines of 1064nm and 1084nm wavelengths of Nd: GdVO4 self-excited Raman crystal as the wavelengths lambda0And a second wavelength lambda2The surface of the crystal opposite to the nonlinear sum frequency crystal 3 can be a plane or a curved surface, a multilayer dielectric film with the reflectivity of more than 99.5% for light beams with the wavelengths of 1064nm, 1084nm and 1175nm and the transmissivity of more than 90% for the light beams with the wavelengths of 808nm is prepared, and an antireflection film with the transmissivity of more than 99% for the light beams with the wavelengths of 1064nm, 1084nm and 1175nm is prepared on the other surface.
Furthermore, the nonlinear sum frequency crystal 3 adopts a nonlinear sum frequency crystal such as LBO, BiBO, KTP or KTA and the like, cutting is carried out according to the phase matching direction of the wavelength of 1084nm and the wavelength of 1175nm sum frequency generation wavelength of 564nm, and antireflection films for light beams with four wavelengths such as 1064nm, 1084nm, 1175nm and 564nm are prepared on two light passing surfaces of the nonlinear sum frequency crystal 3.
Furthermore, the surface film system of the common output coupling mirror 4 close to the nonlinear sum frequency crystal 3 is a multilayer dielectric film which is required to have the reflectivity of more than 99.5% for light beams with the wavelengths of 1064nm, 1084nm and 1175nm, an antireflection film with the transmissivity of more than 90% for the light beam with the wavelength of 564nm, and an antireflection film with the transmissivity of more than 99% for the light beam with the wavelength of 564nm is prepared on the other surface.
When the Nd: GdVO4 crystal in the Raman resonant cavity is pumped by an external light source, laser transition with the wavelength of 1064nm and 1084nm is generated, when a laser beam with the wavelength of 1064nm passes through the Nd: GdVO4 crystal, the laser with the wavelength of 1175nm is generated by frequency shifting the laser with the wavelength of 1064nm due to the stimulated Raman scattering effect, and the laser with the wavelength of 1064nm and 1084nm simultaneously propagate and oscillate in the common resonant cavity; since the nonlinear sum frequency crystal 3 is cut in the direction of matching the phase of 1084nm and 1175nm wavelength sum frequency generation 564nm wavelength, when the 1084nm and 1175nm wavelength laser light is simultaneously incident and passes through the nonlinear sum frequency crystal 3, due to the nonlinear optical sum frequency interaction, the sum frequency laser light with the wavelength of 564nm is generated and output by the common output coupling mirror 4.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (5)
1. A compact self-stimulated raman sum frequency laser wavelength conversion device comprising a common resonator including a common resonator mirror (1) and a common output coupler mirror (4), characterized in that: and a self-excited Raman scattering medium (2) and a nonlinear sum frequency crystal (3) are sequentially arranged between the common resonant cavity mirror (1) and the common output coupling mirror (4).
2. The compact self-stimulated raman and sum frequency laser wavelength conversion device of claim 1, wherein: and the related membrane system of the shared resonant cavity mirror (1) is prepared on the surface of the input end of the self-excited Raman scattering medium (2) to form a new self-excited Raman scattering medium (5).
3. The compact self-stimulated raman and sum frequency laser wavelength conversion device of claim 2, wherein: the new self-excited Raman scattering medium (5) surface can be any one of a concave surface, a plane surface or a convex surface.
4. The compact self-excited raman and sum frequency laser wavelength conversion device according to any one of claims 1 to 3, wherein: the nonlinear sum frequency crystal (3) is any one of LBO, BiBO, KTP or KTA nonlinear sum frequency crystal.
5. The compact structure stimulated raman and frequency laser wavelength conversion device according to claim 2 or 3, characterized in that: the novel self-excited Raman scattering medium (5) adopts a self-excited Raman crystal of Nd: GdVO 4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102055129A (en) * | 2010-11-18 | 2011-05-11 | 苏州生物医学工程技术研究所 | Self-stimulated Raman sum frequency laser wavelength conversion device with compact structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102055129A (en) * | 2010-11-18 | 2011-05-11 | 苏州生物医学工程技术研究所 | Self-stimulated Raman sum frequency laser wavelength conversion device with compact structure |
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Effective date of registration: 20160923 Address after: Kolding road high tech Zone of Suzhou City, Jiangsu Province, No. 88 215163 Patentee after: SUZHOU INSTITUTE OF BIOMEDICAL ENGINEERING AND TECHNOLOGY, CHINESE ACADEMY OF SCIENCES Address before: 215000 No. 14 Longshan Road, hi tech Zone, Jiangsu, Suzhou Patentee before: Suzhou Institute of Biomedical Engineering and Technology |
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Effective date of registration: 20161216 Address after: 300300 Dongli economic and Technological Development Zone, Tianjin Road, No. 1, room 107-05, No. 1 Patentee after: The state of Tianjin Ka Yip Medical Technology Development Co. Ltd. Address before: Kolding road high tech Zone of Suzhou City, Jiangsu Province, No. 88 215163 Patentee before: SUZHOU INSTITUTE OF BIOMEDICAL ENGINEERING AND TECHNOLOGY, CHINESE ACADEMY OF SCIENCES |
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Granted publication date: 20110608 Termination date: 20191118 |