Optical damage studies of mercury thiogallate nonlinear crystals for use in 1-μm pumped optical parametric oscillators

Valentin Petrov; Georgi Marchev; Aleksey TyazhevMarcus BeutlerVladimir PanyutinMarina StarikovaAdolfo Esteban-MartinValeriy BadikovGalina ShevyrdyaevaDmitrii BadikovManuel RezaSvetlana SheinaAnna Fintisova

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Optical damage studies of mercury thiogallate nonlinear crystals for use in 1-μm pumped optical parametric oscillators

机译：Optical damage studies of mercury thiogallate nonlinear crystals for use in 1-μm pumped optical parametric oscillators

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We investigated optical damage (surface and bulk) in one of the most promising wide bandgap nonoxide nonlinear crystals, HgGa_2S_4, that can be used in ～1-μm pumped optical parametric oscillators (OPOs) and synchronously pumped OPOs (SPOPOs) for generation of idler pulses above 4 μm without two-photon absorption losses at the pump wavelength. The optical damage has been characterized at the pump wavelength for different repetition rates using uncoated and antireflection-coated (mainly with a single layer for pump and signal wavelengths) samples. HgGa_2S_4 is the most successful nonlinear crystal (both in terms of output energy and average power) for such OPOs, but optical damage inside the OPO has a lower threshold and represents at present the principal limitation for the achievable output. It is related to peak pulse and not to average intensity, and bulk damage in the form of scattering centers occurs before surface damage. Such bulk damage formation is faster at higher repetition rates. Lower repetition rates increase the lifetime of the crystal but do not solve the problem. The safe pump fluence in extracavity measurements is <1 J/cm~2, which corresponds to ～100 MW/cm~2 for the 8-ns pulse duration (both values peak on-axis). In the OPO, however, peak on-axis fluence should not exceed 0.3 J/cm~2 limited by the formation of bulk scattering centers in orange-phase HgGa_2S_4. In the nanosecond OPO regime, the damage resistivity of Cd-doped HgGa_2S_4 is higher and that of the almost colorless CdGa_2S_4 is roughly two times higher, but the latter has no sufficient birefringence for phase-matching. In SPOPOs operating in the ～100 MHz regime, the damage limitations are related both to the peak pulse and the average intensities, but here HgGa_2S_4 seems the best nonoxide candidate to obtain first steady-state operation with Yb-based mode-locked laser pump sources.

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来源
《Optical Engineering》 |2013年第11期|117102-1-117102-15|共15页
作者
Valentin Petrov; Georgi Marchev; Aleksey TyazhevMarcus BeutlerVladimir PanyutinMarina StarikovaAdolfo Esteban-MartinValeriy BadikovGalina ShevyrdyaevaDmitrii BadikovManuel RezaSvetlana SheinaAnna Fintisova;
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Kuban State University, High Technologies Laboratory, 149 Stavropolskaya Street, 350040 Krasnodar, Russia;

Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Strasse, D-12489 Berlin, Germany;

APE Angewandte Physik und Elektronik GmbH, Haus N, Plauener Strasse, 163-165, D-13053, Berlin, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类计量学;
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Optical damage studies of mercury thiogallate nonlinear crystals for use in 1-μm pumped optical parametric oscillators

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