Raman spectral enhancement system and enhancement method based on photonic crystal fiber resonant cavity
A technology of photonic crystal fiber and fiber resonant cavity, which is applied in Raman scattering, material analysis through optical means, measuring devices, etc., can solve the problems of low precision and error, achieve accurate quantitative and qualitative analysis, improve sensitivity, and Raman The effect of spectral signal enhancement
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[0022] see figure 1 , the LD pumping laser diode with a wavelength of 808nm is selected to provide a light source for subsequent Raman detection. The laser frequency conversion part includes: excitation crystal, frequency doubling crystal and conduction fiber. After the light source generates excitation light, the light is focused into the excitation crystal through the focusing lens, and the 532nm green light is obtained through the frequency doubling crystal.
[0023] In order to avoid the center frequency drift of the laser due to temperature changes, the temperature control system is used to control the temperature of the laser diode, excitation crystal and frequency doubling crystal. When the temperature is too high, the cooling plate starts to work, and its temperature is controlled not to exceed a specific range. At the same time, the laser power can be adjusted by adjusting the temperature and angle of the frequency doubling crystal and the excitation crystal.
[0024...
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