Abstract

Factors influencing the optical bandwidth of a free-running pulsed β-barium borate optical parametric oscillator are examined and incorporated in a simple fitting procedure. Spatiospectral phenomena in the optical parametric oscillator output beam are thereby identified; these suggest a novel way to reduce the effective optical bandwidth for spectroscopic purposes. This technique is demonstrated by recording a degenerate four-wave mixing spectrum of sodium atoms in an air–acetylene flame.

© 1995 Optical Society of America

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