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765nm-780nm pulse laser for raman spectrum analysis

A technology of pulse laser and Raman spectroscopy, which is applied in the field of optoelectronics, can solve the problems of few light sources, high price, and bulky volume, and achieve the effects of good beam quality, improved stability, and small spot size of the fiber output

Inactive Publication Date: 2010-07-07
FUJIAN CASTECH CRYSTALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of less 765nm-780nm light source, high price and bulky in current Raman spectrum analysis

Method used

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  • 765nm-780nm pulse laser for raman spectrum analysis
  • 765nm-780nm pulse laser for raman spectrum analysis
  • 765nm-780nm pulse laser for raman spectrum analysis

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment one: if figure 2 As shown, by semiconductor laser diode (201), using pulse modulation power supply, end-pumped laser gain medium size is 2x2x3 erbium-doped phosphate glass (203), S1: HT-980nm, AR-1560 (+ / -20nm) & 780 (+ / -10nm), to generate 1520nm-1560nm laser, through the size 2.5x3x1.5KTP frequency doubling crystal (204), S1, S2: AR-1550 / 775nm, in the reflection mirror (202) and the output mirror (205) Resonance occurs to generate frequency-doubled light of 760nm-780nm, which is finally output through optical fiber coupling (206). In the experiment, a laser with a repetition frequency of 1kHz, a single pulse energy of 3uj and a pulse width of 20ns was obtained.

Embodiment 2

[0015] Embodiment two: if image 3 As shown, by semiconductor laser diode (301), using pulse modulation power supply, end-pumped laser gain medium size is 2x2x3 erbium-doped phosphate glass (303), S1: HT-980nm, AR-1560 (+ / -20nm) & 780 (+ / -10nm), generate 1520nm-1560nm laser, through the size 2.5x3x1.5KTP frequency doubling crystal (304), S1, S2: AR-1550 / 775nm, in the reflector (302) and the output mirror (305) Resonance occurs to generate frequency-doubled light of 760nm-780nm, which is finally output through optical fiber coupling (306). In the experiment, a laser with a repetition frequency of 1kHz, a single pulse energy of 3uj and a pulse width of 20ns was obtained. The frequency is selected through the etalon (308) outside the cavity to realize single-wavelength modulation.

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Abstract

The invention relates to a 765nm-780nm pulse laser for Raman spectrum analysis, comprising a 980nm laser diode (101) and an end face pumping laser gain medium (103), a resonant cavity is composed of a reflecting mirror (102) and an output mirror (105), 1520nm-1560nm fundamental frequency light is generated and carries out resonance in the resonant cavity through a frequency doubling crystal (104), pulse laser (109) with 760nm-780nm wavelength is output, and the needed wavelength (110) is output through an pulse laser coupling system (106). In the invention, laser glass is used as laser gain medium, the stability of the laser is improved, the price is low, and the price of the whole system is only one fifth of that of the traditional Ti-sapphire laser, and the laser is mainly used for the low-power portable Raman spectrum analyzers.

Description

technical field [0001] The 765nm-780nm pulse laser designed in this scheme belongs to the field of optoelectronics. technical background [0002] Raman spectroscopy is a type of scattering spectroscopy that was discovered in 1928 by Indian physicist C V Raman. Raman spectroscopy has been widely used as an analysis and testing method to identify the structure of substances. Especially after the 1960s, the introduction of laser light sources, the improvement of weak signal detection technology and the application of computers have made Raman spectroscopy analysis a success in many application fields. Great development. At present, Raman spectroscopy has been widely used in materials, chemical industry, petroleum, polymer, biology, environmental protection, geology and other fields. As far as analysis and testing are concerned, the combination of Raman spectroscopy and infrared spectroscopy can more comprehensively study the motion state of molecules and provide more informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/30H01S3/0941H01S3/06H01S3/109
Inventor 王晓仙吴季
Owner FUJIAN CASTECH CRYSTALS
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