Diffraction-limited single-longitudinal-mode multiple-prism flashlamp-pumped dye laser oscillator: linewidth analysis and injection of amplifier system.
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 x 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.
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