Investigation of LBO and BBO subnanosecond optical parametric amplifiers operating in the visible spectrum range

Julius Vengelis; Gabrielė Stanionytė; Eglė Vėjalytė; Viktorija Tamulienė; Vygandas Jarutis

doi:10.1117/12.2619759

30 May 2022 Investigation of LBO and BBO subnanosecond optical parametric amplifiers operating in the visible spectrum range

Julius Vengelis, Gabrielė Stanionytė, Eglė Vėjalytė, Viktorija Tamulienė, Vygandas Jarutis

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Proceedings Volume PC12143, Nonlinear Optics and its Applications 2022; PC121430S (2022) https://doi.org/10.1117/12.2619759
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Laser radiation sources with wide wavelength tunability are of high demand in many applications including nonlinear microscopy, material science, spectroscopy, gas sensing, etc. Laser wavelength tunability is usually very limited, so optical parametric amplifiers (OPA) and optical parametric generators (OPGs) are used as sources of tunable laser radiation. Rapid progress in nonlinear optics enabled creation of a wide range of optical parametric devices with wavelength tunability from VIS to mid-IR spectrum range using pump from CW radiation to femtosecond pulses. However, there are very few optical parametric devices that operate in the subnanosecond duration range are (300 ps - 1 ns) and the few that have been demonstrated operate mainly in the IR spectral range. Since there is a demand of such sources in applications like laser-induced fluorescence, detection of chemical materials, etc., developing subnanosecond optical parametric devices remains an important task. In this study we report, to the best of our knowledge, the first subnanosecond OPAs systems generating widely-tunable radiation in the visible spectrum range. The first demonstrated OPA is based on LBO crystal and the other one - on BBO crystal. To overcome difficulties related to low pump intensity and laser induced damage threshold (LIDT) of nonlinear crystals, we use continuum generated in a photonic crystal fiber as a seed source for the OPAs. Experimental data and numerical simulation reveal that good spectral, temporal and particularly energy characteristics of the seed radiation are crucial in order to achieve efficient parametric generation of signal radiation. This work has received funding from European Regional Development Fund (project No. 01.2.2-LMT-K-718-03-0004) under grant agreement with the Research Council of Lithuania (LMTLT).

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Julius Vengelis, Gabrielė Stanionytė, Eglė Vėjalytė, Viktorija Tamulienė, and Vygandas Jarutis "Investigation of LBO and BBO subnanosecond optical parametric amplifiers operating in the visible spectrum range", Proc. SPIE PC12143, Nonlinear Optics and its Applications 2022, PC121430S (30 May 2022); https://doi.org/10.1117/12.2619759

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KEYWORDS

Visible radiation

Optical amplifiers

Laser damage threshold

Nonlinear crystals

Numerical simulations

Optical parametric oscillators

Photonic crystals

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