Theoretical and experimental study of inversion of spectral absorption function using experimental data of laser absorption spectrum with slow scanning and fast modulation of wavelength

Based on the tested data of laser absorption spectra, a matrix slicing method is proposed to invert function spectral lines by using two parameters modulation frequency and scanning range as well transmitted wave signal reference under condition slow uniform wavelength fast periodic wavelength. When single sinusoidal modulation, an accurate contour line can be obtained consisting values through minimum value slice integrals with interval half period, amplitude estimated. distorted multi-frequency superposition also formed complementarity multiple slices. The above utilized for investigating real inversion process involving overlapping in wavelengths. Moreover, calibrated several range. CO at 4300.700 cm<sup>–1</sup> CO<sub>2</sub> 6336 are successfully this experimental verification.