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The performance and tuning characteristic of organic dye lasers were measured using commercially available coaxial flashlamps as the pumping source. Tuning by a diffraction grating permitted continuous coverage of the 4200-7500-A region at up to 0.6% tuned output energy efficiency. Preliminary results with a 600-J Marx-Bank coaxial laser at 4500 A show 1% efficiency and single-pass unsaturated gain greater than 20 at 4500 A.

A tunable dye laser, operating between 4400 and 4500 Å, was used to monitor NO2 concentrations in a sample chamber 365 m away. The atmosphere in front of and behind the chamber acted as a distributed reflector to send laser light back through the chamber to a receiver near the laser. The laser measurements agreed well with in situ measurements. A single pair of laser pulses allowed the determination of NO2 concentrations with an uncertainty equivalent to 0.05 km ppm.

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