Device for generating high-efficiency multi-wavelength ultra-short pulse lasers
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A technology of ultra-short pulse laser and generating device, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems affecting Stokes light conversion efficiency and achieve the effect of simple structure
Inactive Publication Date: 2014-01-01
HARBIN INST OF TECH
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[0003] The present invention aims to overcome the problem that nonlinear processes such as self-phase modulation, self-focusing and multiphoton dissociation seriously affect the Stokes light conver...
Method used
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specific Embodiment approach 1
[0014] Specific implementation mode one: the following combination figure 1 Describe this embodiment mode, the high-efficiency multi-wavelength ultrashort pulse laser generating device described in this embodiment mode, it comprises laser device 1, spectrometer 2, first focusing mirror 3, quartz optical fiber 4, second focusing mirror 5, the third focusing Mirror 6, Raman cell 7, fourth focusing mirror 8, equilateral dispersion prism 9, fifth focusing mirror 10, mode selection diaphragm 11, first detector 12, second detector 13, frequency doubling crystal 14 and filter light sheet 15;
[0015] The first focusing mirror 3, the quartz optical fiber 4, the second focusing mirror 5, the beam splitter 2, the third focusing mirror 6, the Raman cell 7, the fourth focusing mirror 8, the frequency doubling crystal 14 and the optical filter 15 are sequentially Set on the optical axis of the laser beam output by the laser 1, the laser beam output by the laser 1 is frequency-multiplied b...
specific Embodiment approach 2
[0023] Specific embodiment two: This embodiment further defines the high-efficiency multi-wavelength ultrashort pulse laser generating device described in specific embodiment one. In this embodiment, the laser 1 is a titanium sapphire femtosecond laser, and the laser 1 emits The wavelength of the laser beam is 800nm, and the pulse width is 50fs.
specific Embodiment approach 3
[0024] Specific embodiment three: This embodiment further limits the high-efficiency multi-wavelength ultrashort pulse laser generating device described in specific embodiment one. In this embodiment, the frequency doubling crystal 14 is converted into two kinds of lasers with mixed wavelengths after frequency doubling One beam has a wavelength of 400nm and a pulse width of 70fs; the other beam has a wavelength of 800nm and a pulse width of 50fs.
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Abstract
The invention provides a device for generating high-efficiency multi-wavelength ultra-short pulse lasers to solve the problem that the self-phase modulation process, the self-focusing process and the multiple-photon dissociation process in the transient stimulated raman scattering process under the ultra-short pulse pumping are seriously influenced, and relates to the technical field of non-linear optical equipment. A raman pool is composed of a stainless steel pipe, a fused quartz incidence window without a coating film, and an exit window without a coating film, and pure hydrogen, methane, deuterium gas and the like or mixed gas formed by mixing the pure hydrogen or the methane or the deuterium with inert gas or mixed gas formed by multiple types of raman media can be filled into the raman pool. More stokes wavelength output can be obtained by mixing working gas media, the magnitude of the output stokes wavelength can be adjusted due to the addition of buffer gas, and dense flint materials are selected as materials of an equilateral dispersing prism. The dispersing prism, a fifth focus lens and laser mode selection pinholes are used in cooperation so that different types of laser wavelength output can be selected and energy measurement can be conducted. The device is suitable for the technical field of non-linear optical equipment.
Description
technical field [0001] The invention relates to the technical field of nonlinear optical equipment. Background technique [0002] Ultrashort pulse laser has the advantages of femtosecond and picosecond duration, high peak power, and extremely wide spectral width. Be widely used. Compared with the method of extending laser wavelength based on crystal parametric process, the method of using gas stimulated Raman scattering to obtain ultrashort new wavelength laser has the advantages of low cost, simple device, and less damage. However, when the ultrashort pulse laser is used to pump the Raman medium to obtain new wavelength laser light, the stimulated Raman scattering process is in a strong transient process, so there is a delay between the maximum value of the pump light and the generated SRS pulse, which is The pulse width of the generated pulse will be reduced, and the transmitted wave will be phase-modulated, which will lead to broadening and deformation of the pump light...
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