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Interference between broadened sidebands of a pulse-amplified phase-modulated continuous-wave dye laser

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Abstract

The spectrum of a narrow-band cw laser may be expanded by the generation of equally spaced sidebands through external phase modulation. The spectral profile of the sidebands, which are phased linked, depends on the modulation index. Pulsed amplification of the modulated cw laser broadens each sideband, and thus interference between the sidebands is introduced. It is theoretically and experimentally shown that the resulting spectrum is a function of that interference and depends on the modulation frequency Ω, the amplifier pulse width T, and the phase relation between the periodic refractive index in the modulator and the amplifier pulse. Various spectral line shapes could be generated by varying the modulation parameters and the amplifier pulse timing in relation to the modulator phase.

© 1986 Optical Society of America

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