Abstract
We propose a process to evaluate the safe limit of large-aperture DKDP crystals associated with transverse stimulated Raman scattering (TSRS) at the wavelength of 351 nm. The DKDP crystals’ safety can be assured by controlling the intensity of TSRS-scattering light to the same order of that of Rayleigh-scattering light. We use an optical fiber sensor system to detect side-scattering light in the DKDP and compare the intensity between Raman- and Rayleigh-scattering light. By defining the threshold intensity as a condition in which the intensity ratio between transverse Raman-scattering light and Rayleigh-scattering light exceeds 1, we obtain the threshold intensity of approximately in our experiment. This method enables us to determine the TSRS threshold directly instead of measuring the TSRS gain coefficient and edge reflectivity of the crystals.
© 2015 Optical Society of America
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