Laser-induced damage threshold of ZnGeP crystal for (sub)picosecond 1-µm laser pulse.

The laser-induced damage threshold (LIDT) was measured for a crystal exposed to 0.3-9.5 ps 1030-nm laser pulses.

Compact Radio Frequency Discharge-Pumped Slab CO Laser System with a Zinc Germanium Phosphide (ZnGeP) Sum-Frequency Generator for Remote Sensing of the Atmosphere.

Based on our experimental study of spectral characteristics of an improved compact CO laser system, the prospects of using such a laser system for solving urgent problems of atmospheric sounding were demonstrated. An increase in the number of laser lines due to intracavity generation of the second harmonic and sum-frequencies in a nonlinear zinc germanium phosphide (ZnGeP) crystal enriches capabilities of the laser. It was shown that such a CO laser system with frequency conversion in ZnGeP crystal can be used for detection and measuring concentration of at least 14 minor natural and pollution gases components of the atmosphere.

Broadband (8.5-13.5 µm) intra-pulse difference frequency generation in a LiGaS crystal of a 90 fs 744 nm laser pulse after its continuous redshift in air.

Broadband frequency downconversion of a 90 fs 744 nm Ti:sapphire laser pulse into the mid-infrared (IR) was demonstrated via its filamentation-induced self-frequency shift in air and subsequent intra-pulse difference frequency generation in a crystal. The filamentation of the laser pulse in air provided its continuous spectral broadening to the Stokes wing with spectral humps separated by ∼1000 that was appropriate for the laser pulse difference frequency conversion into the mid-IR. The difference frequency emission spectrum spanned from 8.

Asymmetric spectral broadening of sub-picosecond laser pulse in BaWO crystal: interplay of self-phase modulation, stimulated Raman scattering, and orientational Kerr nonlinearity.

Spectral broadening of 0.3 ps 515 nm laser pulse in a highly Raman-active crystal and fused silica demonstrates significantly different behavior with the incident pulse energy. While the broadening in fused silica is fairly symmetric with respect to the pump laser pulse wavelength, the Stokes wing broadening in the crystal is 2 times wider than that of anti-Stokes wing, the former demonstrating a step-like increase with the pulse energy.

Highly efficient stimulated Raman scattering of sub-picosecond laser pulses in BaWO for 10.6 µm difference frequency generation.

Transient stimulated Raman scattering (SRS) of 0.3 ps 515 nm laser pulses in ${\rm BaWO_4}$BaWO crystal was experimentally demonstrated with efficiency up to ${\sim}{20}\% $∼20% for the Stokes component with a wavenumber of ${\sim}{925}\;{{\rm cm}^{ - 1}}$∼925cm in a simple single-pass geometry. This anomalous high efficiency was obtained due to the laser pulse self-phase modulation resulting in spectral broadening and seeding the SRS.