Hydrogen fluoride overtone laser: 2D CFD modeling of the small signal gain
The small signal gain of a small-scale HF overtone laser was measured using a sub-Doppler tunable diode laser system. The spatially resolved, two-dimensional small signal gain maps that were generated...
Ultraviolet femtosecond and nanosecond laser ablation of silicon: ablation efficiency and laser-induced plasma expansion
Femtosecond laser ablation of silicon in air was studied and compared with nanosecond laser ablation at ultraviolet wavelength (266 nm). Laser ablation efficiency was studied by measuring crater depth...
Proc. SPIE, Vol. 5448, 1139 (2004);
doi:10.1117/12.546483
Online Publication Date: 25 October 2004
Conference Date: Sunday 25 April 2004
Conference Location: Taos, NM, USA
Conference Title: High-Power Laser Ablation V
Conference Chairs: Claude R. Phipps
Theactivity of development a COIL with high potential recovered pressure,high gain and efficiency is described. Two nozzle banks withconical supersonic nozzles for the driver nitrogen but with differentnozzle arrangements have been developed for generation of the gainflow of chemical oxygen-iodine laser. The nozzle banks were suppliedby oxygen flow from the cross-flow singlet oxygen generator withfilament-guided jets. Results of aerodynamic tests, visualization of flows bylaser induced fluorescence, scanning of the excited iodine atoms distributionand laser power extraction are presented. The efficient penetration ofthe driver buffer flow into the gain flow was observedat distances less than 100 mm from the nozzle banks.The total power exceeding 1 kW with chemical efficiency morethan 24% was obtained in 5 cm gain length COILwithout helium dilution. The lasing was observed for both nozzlebanks at total mirror transmission more than 10%.
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