Method for improving stability of ultra-short laser frequency-doubling energy

An ultra-short laser, stable technology, used in lasers, laser parts, phonon exciters, etc., can solve the problems of energy stability deterioration, energy stability requirements, etc., to improve energy stability, vertical and horizontal Distribution smoothing effect

Active Publication Date: 2015-06-03
NUCTECH CO LTD
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Problems solved by technology

Generally, the fundamental frequency light energy output by a laser system based on a multi-pass amplifier can reach 2% root mean square energy stability. According to the common understanding, the energy stability of the generated triple frequency light will deteriorate to the fluctuation of the fundamental frequency light energy jitter. Three times, this brings gr

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  • Method for improving stability of ultra-short laser frequency-doubling energy
  • Method for improving stability of ultra-short laser frequency-doubling energy
  • Method for improving stability of ultra-short laser frequency-doubling energy

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Embodiment Construction

[0029] Hereinafter, the method of the present invention will be described in detail with reference to the drawings.

[0030] First, as the basis of the present invention, the laser used is selected according to needs, and the basic parameters of the fundamental frequency light output by the laser are specified, such as central wavelength, spectral bandwidth, maximum output energy, and compressed pulse width. According to these basic parameters, parameters such as the maximum peak power of the laser pulse, the laser light intensity under different beam apertures, and the adjustable range of the laser intensity can be estimated. Thus, the basic parameters of the laser system are clarified. In addition, similarly, the frequency tripler crystal used can be selected as needed, for example, a BBO crystal can be selected and used.

[0031] Then, for the basic parameters of the laser system such as pulse width and spectral width and the frequency tripler crystal used, use the coupled...

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Abstract

The invention relates to a method for improving the stability of ultra-short laser frequency-doubling energy. The method is characterized by comprising the following steps: (a) obtaining a curve of triple frequency conversion efficiency relative to the light intensity of fundamental-frequency light; (b) obtaining a range of light intensity corresponding to a decline part of the curve according to the decline part; and (c) adjusting the basic parameters of the fundamental-frequency light to enable the light intensity of the fundamental-frequency light to be within the range of light intensity. According to the invention, by selecting fundamental laser parameters (pulse energy, pulse width, and beam aperture) and crystal parameters, the frequency tripling process is enabled to work in an appropriate position of the decline part of the curve of triple frequency conversion efficiency, and thus the energy stability of triple-frequency light is significantly improved. The passive stability improving method breaks through the limit that the traditional triple-frequency light energy jitter is about three times the fundamental-frequency light energy jitter, the energy stability of triple-frequency light is obviously better than that of fundamental-frequency light, and the smoothness of transverse distribution and longitudinal distribution of triple-frequency light can be significantly improved.

Description

technical field [0001] The invention relates to a method for improving the energy stability of ultrashort laser frequency doubling, in particular to a method for improving the energy stability of ultrashort laser triple frequency. Background technique [0002] It is generally believed that since the triple frequency of the ultrashort laser is a third-order nonlinear process, the energy jitter of the tripled output is close to three times the jitter of the fundamental frequency laser. Generally, the fundamental frequency light energy output by a laser system based on a multi-pass amplifier can reach 2% root mean square energy stability. According to the common understanding, the energy stability of the generated triple frequency light will deteriorate to the fluctuation of the fundamental frequency light energy jitter. Three times, this brings great limitations to applications such as photocathode injectors that require high energy stability of ultra-short ultraviolet lasers....

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Application Information

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IPC IPC(8): H01S3/13H01S3/109
Inventor 颜立新黄志华游燕唐传祥
Owner NUCTECH CO LTD
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