Optical Setup of Two-Crystal KTP-NOPA

Optical setup of the two-stage KTP NOPA for generation of ultra-broadband mid-IR pulses.[1] KTP – 2-mm thick crystals; P-ZnSe – 2-mm thick polycrystalline ZnSe crystal; S – 2-mm thick sapphire plate; PBS – polarizer-beam splitter; HW – half-wave plates; SF18 – equilateral prisms; BS – BK7 beam splitter; DL – delay line; CaF₂ – 50-mm lens; all other optics – BK7-based lenses, flat and spherical mirrors/ Orientation of the z- and x-axes is shown. SFG – idler-800nm sum-frequency generation from P-ZnSe. SHG – second-harmonic generation from the signal pulses.

Reference:
Isaienko, O. and Borguet, E., Ultra-broadband infrared pulses from a potassium-titanyl phosphate optical parametric amplifier for Vis-IR-SFG spectroscopy, in Ultrafast Phenomena XVI, Springer Series in Chemical Physics, 2009, Volume 92, Part 9, 777-779, DOI: 10.1007/978-3-540-95946-5_252