Simultaneous single-shot measurement of temperature and pressure along a 1-D line by use of Laser Induced Thermal Grating Spectroscopy
Optics Letters 31:8 (2006) 1055-1057
Intelligent design: The response
Physics World 18:12 (2005) 18-19
SPECTROSCOPY | Nonlinear Laser Spectroscopy
Chapter in Encyclopedia of Modern Optics, Elsevier (2005) 109-119
High-resolution degenerate four-wave-mixing spectroscopy of OH in a flame with a novel single-mode tunable laser
Applied Physics B: Lasers and Optics 79:6 (2004) 767-773
Abstract:
The first application of a novel single-mode tunable laser system to nonlinear spectroscopy is reported. The device uses a modeless dye laser, pumped by a single longitudinal mode (SLM) Q-switched Nd:YAG laser, as a narrow-bandwidth amplifier of the output of a SLM diode laser. The system provides pulses of 5-ns duration, 30-mJ energy and 165-MHz spectral line width tunable in the range 632-639 run at 10-Hz repetition rate. The frequency-doubled output of the laser is used to record spectral line shapes of degenerate four wave mixing (DFWM) signals from the P1(15) line of the A2σ-X2π (0, 0) band of OH in a methane/ oxygen flame. Pressure broadening of the DFWM line shape is studied for the first time in a low-pressure flame and a pressure-broadening rate of 1.31 ± 0.09 × 10-4 cm-1/Torr is derived from the data. Powerbroadening effects are measured and compared with predictions of the standard perturbative model and of an analytical solution derived from a non-perturbative treatment of DFWM with arbitrary pump and probe intensities.Single-shot measurement of temperature and pressure using laser-induced thermal gratings with a long probe pulse
APPLIED PHYSICS B-LASERS AND OPTICS 78:1 (2004) 111-117