We present numerical investigations to evaluate the performance of the second-harmonic generation (SHG) for a 100 J, 1 Hz Nd:glass laser operating at 1053 nm under different phase-matching conditions in a large-aperture DKDP crystal. Steady state temperature maps for different crystal length, as well as temperature bandwidth analysis under different phase-matching conditions are presented. Studies show that the SHG efficiency drops due to thermal dephasing for the type-I and type-II configurations are 14.6 % and 3.6 %, respectively. Since the type-I SHG implementation is more straightforward and cost-effective in the laser facility, we focused on how to improve its performance in the present work. Besides some existing routines, we proposed here a new approach to mitigate the thermal dephasing issue, by pre-detuning the phase-matching angle for the DKDP crystal. The results show that performance of type-I SHG can be greatly improved by this new approach, with the efficiency drop being reduced from 14.6 % to 3.9 %. We believe that our findings would be beneficial to the construction of ultra-short, ultra-intense laser drivers with reliability, cost-effectiveness and fewer number of large optics.
Kilo-joule Laser System (KLS) is constructed as a X-ray backlighting resource, to provide X-ray for performing X-ray diagnostic experiments. As a crucial component of KLS, backlighting terminal system has such function as frequency conversion, color separation, laser transport, beam focusing, target alignment and debris shielding, enabling focal spot energy(2ω) of 500J in 1ns pulse, with target alignment accuracy of ≤±25 μm.
Optical poling and frequency doubling effect is one of the effective manners to induce second order nonlinearity and realize frequency doubling in glass materials. The classical model believes that an internal electric field is built in glass when it’s exposed by fundamental and frequency-doubled light at the same time, and second order nonlinearity appears as a result of the electric field and the orientation of poles. The process of frequency doubling in glass is quasi phase matched. In this letter, the physical process of poling and doubling process in optical poling and frequency doubling effect is deeply discussed in detail. The magnitude and direction of internal electric field, second order nonlinear coefficient and its components, strength and direction of frequency doubled output signal, quasi phase matched coupled wave equations are given in analytic expression. Model of optical poling and frequency doubling effect which can be quantitatively analyzed are constructed in theory, which set a foundation for intensive study of optical poling and frequency doubling effect.
We measured the Raman spectra of the ν1 mode in KDP crystal over the temperature range from 285.3 K to 345.2 K. And the temperature dependence of the Raman characteristics (Raman shift, FWHM and intensity) were well analyzed. The result reveals that with temperature increasing the ν1 mode displays a red-shift and the linewidth broadens, but the scattering intensity shows no obvious tendency. The stimulated Raman scattering (SRS) gain coefficient of the ν1 mode decrease about 12% at 345.2 K.
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