Method and device for generating multi-wavelength Raman laser by Raman frequency conversion
A frequency conversion and multi-wavelength technology, which is applied to lasers, laser components, and lasers using scattering effects, etc., can solve the problems of high Raman light threshold and poor Raman light beam quality, achieve high beam quality, and improve beam quality. quality, damage avoidance effect
Active Publication Date: 2016-04-06
北京赢圣科技有限公司
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However, the generation threshold of Raman light in this scheme is relatively high, and the beam quality of Raman light is often poor
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[0057] The pulsed linearly polarized 532nm pump light emitted by the Nd:YAG pump source is split into two parts by the beam splitter with a ratio of reflection and transmittance of 1:1. Half of the pump light is directly incident on the Raman seed source generator through the delay part, and is used to excite the Raman seed light. The other half of the pump light bypasses the Raman seed source generator and serves as the pump source for the Raman amplifier.
[0058] The two structures of the Raman seed source are suitable for pump sources with different repetition frequencies. The pump light with high repetition frequency can use the structure of an external Raman cavity, and the pump light with low repetition frequency is suitable for single-pass Raman. The structure of the generator. Here, an external Raman cavity is taken as an example. The pump light incident on the Raman seed source generator is coupled into the Raman cavity through an input mirror that is highly transpa...
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The invention provides a method for producing multi-wavelength laser by adopting Raman frequency conversion. The method comprises the following steps: incident pumping light is divided into a first beam and a second beam by a beam splitter; after the division, the first beam passes through a Raman seed resource generator, is reflected and then enters into a Raman amplifier in a paraxial incidence manner to serve as pumping light impulse of the Raman amplifier; the second beam enters into the Raman seed resource generator in an incidence way to form Raman seed light; the optical path difference of the Raman seed light and the pulse of the pumping light is adjusted through a time delay part so as to enable the Raman seed light and the pumping light to be superposed in time domain; the pulse of the pumping light and the Raman seed light form a small angle and together enter into the Raman amplifier, and multi-wavelength laser output is achieved through four-wave mixing. Devices for implementing the method are a laser pumping source, a beam splitter, a plurality of total reflective mirrors, the time delay part, the Raman seed source generator and the Raman amplifier. According to the invention, by adopting the way of pumping light paraxial incidence and using the principle of four-wave mixing, the production of the non-coaxial multi-wavelength Raman lasers is achieved.
Description
technical field [0001] The invention belongs to the field of laser frequency conversion, in particular to a method and a device for generating multi-wavelength laser by using Raman frequency conversion. Background technique [0002] The output wavelength of existing lasers is determined by the energy level structure of doped ions in the laser crystal. However, the types of doping ions are mostly common, such as Nd, Er, Yb, etc., so the output wavelength is relatively fixed and single. Many lasers with specific wavelengths have strong practical value, but cannot be directly generated from existing laser crystals. In order to meet the needs of different occasions, it is necessary to perform frequency conversion on existing wavelengths. At present, the common frequency conversion methods mostly use the second-order nonlinear effect of nonlinear crystals to realize the frequency multiplication and difference frequency of the fundamental frequency light. Most of these methods ...
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IPC IPC(8): H01S3/108H01S3/30
Inventor 李港徐洋陈檬
Owner 北京赢圣科技有限公司