Spatial-spectral transformation of laser radiation

Vladimir V. Fedorov; Igor S. Moskalev; Sergey B. Mirov; Tasoltan T Basiev; Petr G. Zverev

doi:10.1117/12.506234

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3 November 2003 Spatial-spectral transformation of laser radiation

Vladimir V. Fedorov, Igor S. Moskalev, Sergey B. Mirov, Tasoltan T Basiev, Petr G. Zverev

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Proceedings Volume 5175, Laser Beam Shaping IV; (2003) https://doi.org/10.1117/12.506234
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

This paper is focused on a design of flexible laser systems capable to provide spatial transformation of the pump radiation into the spectral domain of the output laser oscillation using specially designed “spatially dispersive” laser cavity. These systems also provide ultrabroadband or controlled spectral linewidth of the output laser oscillation. The theoretical analysis based on gaussian approximation for the designed laser cavities with “spatial dispersion” was used to provide maximum spatial resolution of the spatial-spectral transformation. The transformations of the spatial distribution of the pump radiation into the spectral domain of the output laser oscillation were experimentally demonstrated in the gain-switched LiF:F₂^+** and LiF:F₂^- lasers with total efficiencies of up to 20% and output pulse spectrum width wider than 140 nm, centered at 0.96 μm and 1.14 μm, correspondingly. As a result of the optimization of the angular dispersion of the output radiation, the simultaneous phase-matching for second harmonic generation in the single nonlinear crystal was realized for the whole oscillation spectral range. This technique allows to use a nonlinear frequency conversion for nonlinear transformation of the beam spatial distribution. Due to this, the ultra broadband (>100 nm) or multiline (20 lines) second harmonic and sum frequency oscillations were demonstrated in a LiIO₃ nonlinear crystal with an overall efficiencies of up to 12%.

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Vladimir V. Fedorov, Igor S. Moskalev, Sergey B. Mirov, Tasoltan T Basiev, and Petr G. Zverev "Spatial-spectral transformation of laser radiation", Proc. SPIE 5175, Laser Beam Shaping IV, (3 November 2003); https://doi.org/10.1117/12.506234

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