Exploring Transverse Raman Scattering in KDP Crystals for Large Optic Laser Damage Mitigation

Dr. Tanya Kosc, Laboratory for Laser Energetics

Friday, April 23, 2021
1:30 p.m.

Transverse stimulated Raman scattering (TSRS) in potassium dihydrogen phosphate (KDP) optics for large-aperture laser systems represents an important mechanism for energy loss and laser-induced damage of both the optic and its mount. A specialized experimental system utilizing spherical samples has been developed to accurately determine the Raman tensor of the dominant A1 mode and to effectively enable measurement of the transverse Raman scattering in 360° around the beam propagation direction for any crystal optic-axis orientation.  A discussion of experimental results and the progress toward optimizing the design and manufacture of large optics with a suppressed TSRS gain is presented.