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ISSN: 1023-5086

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ISSN: 1023-5086

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Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2025-92-11-23-33

УДК: 535.15

Narrow-linewidth broadly-tunable mid-infrared parametric source based on zinc germanium diphosphide crystals

Eranov I.D., Antipov O.L., Dobrynin A.A., Getmanovsky Y.A., Sharkov V.V.
For Russian citation (Opticheskii Zhurnal):

 Еранов И.Д., Антипов О.Л., Добрынин А.А., Гетмановский Ю.А., Шарков В.В. Узкополосный широкоперестраиваемый параметрический источник света среднего инфракрасного диапазона на основе кристаллов дифосфида цинка-германия // Оптический журнал. 2025. Т. 92. № 11. С. 23–33. http://doi.org/10.17586/1023-5086-2025-92-11-23-33

 

Eranov I.D., Antipov O.L., Dobrynin A.A., Getmanovskiy Yu.A., Sharkov V.V. Narrow-linewidth broadly-tunable mid-infrared parametric source based on zinc germanium diphosphide crystals [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 11. P. 23–33. http://doi.org/10.17586/1023-5086-2025-92-11-23-33

For citation (Journal of Optical Technology):
-
Abstract:

Subject of study. A narrow-linewidth widely tunable parametric mid-infrared light source, consisting of a single-resonant optical parametric oscillator and an optical parametric amplifier based on zinc germanium diphosphide nonlinear crystals, pumped by a repetitively pulsed Ho3+:YAG laser. Aim of study. The principle of creating a broadly-tunable repetitively-pulsed mid- infrared radiation source with a narrow linewidth and high pulse energy. Method. Development of the narrow-linewidth operation was formed by using an intracavity Fabry–Perot etalon — a Si wafer with thickness of 33 or 56 µm. The broadly wavelength tuning was realized by changing the temperature of the etalon and the nonlinear crystal. The parametric amplifier provided an increase in pulse energy. Main results. Narrow-linewidth operation of the parametric source (with a signal linewidth of 3–8 nm) was tuned at 3860–4130 and 4210–4565 nm for the signal and idler, respectively. The energy in the pulses with a repetition rate of 10–50 Hz reached 1.7 mJ for the narrow-linewidth radiation and 4.8 mJ for broadband operation (or frequency combs). Practical significance. This powerful narrow-line radiation, tunable in the range of 3.8–4.6 µm, has potential applications in remote environmental monitoring, particularly for detecting greenhouse gases such as CO2 and CO, wireless optical communication or in selective interactions with materials such as silicon and diamond.

Keywords:

parametric light generators, nonlinear optical crystal, mid-infrared range, Fabry–Pe€rot etalon, narrow spectral generation line, synchronism conditions, thermo-optical coefficient of silicon, wavelength tuning, temperature dependence of the crystal refractive index

Acknowledgements:

the research was supported by the Russian Science Foundation (project № 22-12-20035), and Nizhniy Novgorod Ministry of Science and Education (contract 316-06-16-24/23, signed on 20.04.23).

OCIS codes: 190.4970, 140.3600, 300.3700, 160.6030

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