Stable-power rapid-scanning absorption spectrum device and method based on polarization rotator
A polarization rotator and fast scanning technology, applied in the field of laser spectroscopy, can solve the problem of low detection sensitivity, achieve the effect of increasing acquisition rate, accelerating data acquisition rate, and reducing light intensity noise
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[0030] The technology of the present invention will be further described below in conjunction with the accompanying drawings.
[0031] Such as figure 1 As shown, the 1KHz triangular wave fast scanning signal generated by the function generator 1 is sent to the distributed feedback laser 2 (NTT, NLK1L5EAAA) for scanning the output wavelength of the laser. The scanned laser beam becomes linearly polarized light through the polarizer 3, then passes through the polarization rotator 4, enters the analyzer 5, and then is divided into two parts by a 1:9 optical fiber beam splitter: the light intensity is stronger A part passes through the gas absorption cell 8 through the second collimating mirror 7, and is detected by the second photodetector 9 (PDs, Thorlabs, PDA10CS-EC) after interacting with the gas, and the absorption signal is finally sent to the computer 10; A collimating mirror 11 is then detected by a first photodetector 12, and fed back to the polarization rotator 4 throug...
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