Mid-infrared diode pumped Cr: ZnSe laser continuously tunable from 2.1 μm up to 2.7 μm operated at room temperature

Adam Říha; Helena Jelínková; Maxim E. Doroshenko; Jan Šulc; Karel Veselský; Michal Němec; Miroslav Čech; V. V. Badikov

doi:10.1117/12.2659160

12 December 2022 Mid-infrared diode pumped Cr: ZnSe laser continuously tunable from 2.1 μm up to 2.7 μm operated at room temperature

Adam Říha, Helena Jelínková, Maxim E. Doroshenko, Jan Šulc, Karel Veselský, Michal Němec, Miroslav Čech, V. V. Badikov

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Proceedings Volume 12502, 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 1250202 (2022) https://doi.org/10.1117/12.2659160
Event: 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2022, Wojanow, Poland

Abstract

The spectroscopic and laser characteristics of optically polished Cr:ZnSe single crystals in four different lengths of 2, 3, 5, and 10 mm were investigated when pumping with a laser diode generating radiation at the wavelength of ~1.69 μm. The optimization from the point of laser efficiency was done in dependence on the crystal samples active length, effect of antireflection (AR) coatings, pumping pulse duration, and repetition rate. As a result, a 3 mm thick anti-reflection coated Cr:ZnSe crystal pumped by a laser diode with a pulse length of 20 ms and repetition rate of 10 Hz was chosen as the optimal. Using a 0.8 mm thick MgF₂ birefringent filter the laser oscillations were continuously tunable from 2.1 μm up to 2.7 μm with the narrow spectral linewidth of ~5 nm and Gaussian beam profile. Maximum mean output power of ~0.35 W and maximum optical-to-optical slope efficiency of ~39% was obtained for 3 mm thick AR-coated sample which was ~28% and ~10% higher than that for uncoated sample of the same thickness, respectively. Continuously tunable laser oscillation wavelength was measured in the range of ∼2.1-2.7 µm with the mean output power of P ≥ 150 mW within a ∼5 nm linewidth. The absorption and fluorescence spectra as well as fluorescence lifetime were also measured. The Cr²⁺ fluorescence lifetime of ∼7.2 µs measured for the 1 ns pulse excitation at room temperature (RT) was constant within the whole absorption band of 1.35–2.25 µm.

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Adam Říha, Helena Jelínková, Maxim E. Doroshenko, Jan Šulc, Karel Veselský, Michal Němec, Miroslav Čech, and V. V. Badikov "Mid-infrared diode pumped Cr: ZnSe laser continuously tunable from 2.1 μm up to 2.7 μm operated at room temperature", Proc. SPIE 12502, 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 1250202 (12 December 2022); https://doi.org/10.1117/12.2659160

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KEYWORDS

Crystals

Laser crystals

Luminescence

Absorption

Pulsed laser operation

Tunable lasers

Chromium

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