Q-switched fiber laser intra-cavity photoacoustic spectrometry gas detection system
A gas detection system, fiber laser technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of improving detection sensitivity limit, low sensitivity, loss of light energy, etc., to improve detection sensitivity, increase detection signal strength, cost low effect
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Embodiment 1
[0022] like figure 1 As shown, a Q-switched fiber laser intracavity photoacoustic gas detection system includes a pump light source 1, a wavelength division multiplexer 2, a rare earth doped fiber 3, an optical isolator 4, a gas chamber 5, and an input coupling mirror 13 , output coupling mirror 14, quartz tuning fork 6, Q-switching switch 7, fiber coupler 8, photodetector 9, data acquisition card 10, lock-in amplifier 11, computer 12, it is characterized in that pumping light source 1 output terminal is connected with WDM The multiplexer 2 corresponds to the input end, the composite end of the wavelength division multiplexer 2 is connected to one end of the rare earth doped fiber 3, the other end of the rare earth doped fiber 3 is connected to the input end of the optical isolator 4, and the output end of the optical isolator 4 is connected to the gas chamber The input coupling mirror 13 placed in 5, the optical axes of the input coupling mirror 13 and the output coupling mir...
Embodiment 2
[0029] Same as Embodiment 1, except that the rare earth-doped fiber 3 is an ytterbium-doped fiber.
Embodiment 3
[0031] Same as Embodiment 1, except that the rare earth-doped fiber 3 is a thulium-doped fiber.
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