The phase matching and effective nonlinear coefficients in three planes of BaGa4Se7 (BGSe) crystal are simulated, and the optimal design of phase matching planes and matching types is given. At the same time, the cavity length and pump intensity threshold of the OPO are analysed, and the partial optimization design of the OPO is given. The experimental platform of optical parametric oscillator is designed and built. The idle pulse energy of 2980 nm is 0.806 mJ, 4132 nm is 0.263 mJ, and 6118 nm is 0.084 mJ. The corresponding optical-optical conversion efficiencies are 7.8%, 2.5% and 1%, and the slope efficiencies are 9%, 2.8% and 1.4%, respectively.
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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.