Method and device for amplifying laser by adopting raman frequency conversion
A frequency conversion and laser amplification technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of poor Raman light beam quality and high Raman light threshold, and achieve improved beam quality and high beam quality. , the effect of avoiding damage
Active Publication Date: 2013-11-20
BEIJING UNIV OF TECH
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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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[0060] 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 pumping light bypasses the Raman seed source generator and serves as the pumping source of the Raman amplifier for Raman amplification of the Raman seed light.
[0061] 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 ...
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The invention provides a method for amplifying the laser by adopting the raman frequency conversion. The method comprises the following steps of utilizing a beam splitting mirror to split the incident pump light into a first path of light beam and a second path of light beam; ensuring the split first path of light beam to round a raman seed source generator, to be reflected and enter a beam combiner; ensuring the second path of light beam to enter the raman seed source generator to form raman seed light through a delay part; adjusting the pulse of the raman seed light source and the pump light, facilitating the overlapping of the raman seed light source and the pump light in the space and on the time domain so as to form a coaxial beam; and ensuring the coaxial beam to enter a raman amplifier so as to amplify the energy of the raman seed light. The device for implementing the method comprises a laser pump source, a beam splitting mirror, a first totally-reflecting mirror, a second totally-reflecting mirror, a delay part, a raman seed source generator, a beam combiner and a raman amplifier. By adding the beam splitting part, the beam combining part and the delay part, the energy amplification of the raman light can be realized, and the quality of the raman beam also can be guaranteed.
Description
technical field [0001] The invention belongs to the field of laser frequency conversion, in particular to a method and device for amplifying laser light by adopting 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, difference frequency, and sum frequency of the fundamental frequency light. Most of these me...
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IPC IPC(8): H01S3/108
Inventor 陈檬徐洋李港
Owner BEIJING UNIV OF TECH