The Measurement And Application Analysis Of Time-space Distribution For Continuous Wave HF/DF Chemical Laser Spectrum

The component, distribution, and change of the spectrum are the external manifestation of the internal state of the chemical lasers. Because the measurement and reseach of DF laser spectrum are much in short, systemic measure of the spectrum of DF laser is not performed all the time. Thus, it is of great practical significance for the real application and research of DF lasers to systemically measure the spectrum of DF laser.According to the spectral characteristics of the DF laser, parts of the infrared spectra are classified and provided with corresponding spectral products. Through comparative analysis, proper optical spectrum analyzers of DF laser such as Tensor37 and MR-170 are selectively chosen for the best at present.The Tensor37 and MR-170 optical spectrum analyzers are calibrated with one-point measurement, their temporal and spatial resolution are validated through real spectra measuring, and the consistency of the measurement is compared. The results present that the normal relative response coefficient and spectral measurement consistency of Tensor37 and MR-170 optical spectrum analyzers satisfy the spectral measuring needs of DF laser.The spectral variation of DF laser at 5, 10 and 30second lasing time are analyzed, and we find that: (a) the long-time spectral line composition keep the same under DF laser's normal operation; (b) the spectral competition is limited in each spectral band; (c) the relative intensity fluctuation is enhanced by cascading spectra; (d) and no apparent change trend of the spectral band is observed.The upstream and downstream spectra of stable cavity HF laser spot are measured twice with the Tensor37 optical spectrum analyzer, their spectral composition consist with each other, and the relative intensity difference is not found. The up- and low- stream spectra of instable cavity DF laser spot are measured at the same time with Tensor37 and MR-170 optical spectrum analyzers. The main components of the spectral line do not change apparently, however, the inband quantum number at relative maximal intensity trend to the lower rotational quantum number. Also the spectral variation of DF laser is examined by changing of cavity axis discharge driven DF chemical laser.The analysis of P band spectral gain of the DF laser shows that the DF laser's inband spectral gain of Jm and Jo varies with the cavity temperature and relative particle population ratio. On the basis that inband spectral quantum number at relative maximal intensity consists with Jm, and the minimal gain quantum number JL at the shortwave direction is greater that zero, given that the spectral line gain of quantum number JL-1 is smaller than zero and temperature change region of different spectra band keep the same, the cavity temperature and relative particle population region of long-time spectra and up- and low- stream spectra in DF laser are estimated, and the estimated variation trend consist with the analyzed result of DF laser.