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Anguang's wavelength modulation off-axis integral cavity output spectroscopy system
[ Instrument Network Instrument Development ] Recently, Anguang Institute Gao Xiaoming's research group has made new progress in improving the performance of off-axis integral cavity output spectroscopy instruments. The related research results are to achieve high-sensitivity off-axis integral cavity output spectrum with wavelength modulation and white noise disturbance. High-sensitivity off-axis integrated cavity output spectroscopy implementation wavelength-modulation and white noise perturbation is published in the international academic journal Optics Letters.
The off-axis integral cavity output spectroscopy technology based on optical cavity has the advantages of high sensitivity and fast response time, and has broad application prospects in the detection of atmospheric trace gases and deep sea combustible ice exploration. The research team's doctoral student Wang Jingjing and others used a 1.65μm DFB laser and a 99.999% high-reflection mirror to establish a wavelength-modulated off-axis integrated cavity output spectroscopy system.
The laser uses three different frequency injection currents to simultaneously modulate the low frequency triangular wave for scanning the laser wavelength, the high frequency sine wave for wavelength modulation and 1/f noise, and the radio frequency (RF) white noise for suppressing the residual cavity mode. Noise caused by fluctuations. This RF white noise perturbed wavelength modulated off-axis integrated cavity output spectrum has a minimum detectable limit of about 6 times higher than the undisturbed off-axis integrated cavity output spectrum.
This research has important application value for the development of trace gas detection instruments with off-axis integral cavity absorption spectroscopy. The research work was supported by projects such as the National Key R&D Program.
(Original title: Anguang's established wavelength modulation off-axis integral cavity output spectroscopy system)