In this paper, we present results of a study on a compact multiple-prism Littrow flashlamp-pumped dye laser oscillator. Single longitudinal mode at a linewidth ≤375 MHz was achieved in a diffraction-limited laser beam with a divergence of 0.5 mrad at full angle. Output energy was 11 mJ for rhodamine 590 at a concentration of 5 × 10^-5 M. A detailed analysis of linewidth characterization is provided, and results demonstrating suppression of double-mode operation to produce single-mode oscillation are described. Also, we provide experimental evidence of linewidth variations during the laser pulse. A flashlamp-pumped positive-branch confocal unstable resonator was used to amplify the narrow-linewidth emission from the oscillator to an output energy of 600 mJ.

© 1987 Optical Society of America

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