We discovered novel phenomenon of periodical spectral peaking in optical fibers. When an ultrashort pulse with sharp spectral dips is coupled into an optical fiber, the spectral dips are transferred into spectral peaks periodically along an optical fiber. If a molecular gas cell is used, sharp spectral peaks with sub-THz spectral interval are generated simultaneously and stably. Intense, multiple spectral peak generation was demonstrated by inserting the molecular gas cell into the fiber laser oscillator. Recently, precise, and freely controllable spectral peak generation was achieved using spatial light modulator. This technique is useful for the highly sensitive spectroscopic applications.
For monitoring of intense radiation fields, such as around nuclear reactors, high energy accelerators, it is requested to develop a reliable radiation sensing method with high radiation resistance. As one of the promising methods, we propose a novel radiation remote-sensing method based on high sensitive cavity ring-down (CRD) laser spectroscopic measurement of radiation induced radicals. To verify the detection principle, we have made basic experiments on the CRD spectroscopic measurement of the radiation induced ozone concentration in the air irradiated by 60Co gamma-rays, while we have also developed the calculation model to estimate the yields of radiation induced radicals by solving simultaneous rate equations numerically. Through comparison between the experiments and the calculations, we have confirmed the detection principle and the validity of the calculation model, where the results show that the detectable range for the absorbed dose rate is from 4.8x10-2 to 3.2 Gy/s with time resolution of 35 sec by controlling the flow rate of the irradiated air.
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