The Conversion Efficiency of Femtosecond Ytterbium Fiber Laser Pulses to the Mid-IR Range in AgGaS₂, BaGa₄Se₇, and HgGa₂S₄ Crystals

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发表日期：

2024年12月1日

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I. O. Kinyaevsky,
N. A. Smirnov,
A. V. Koribut,
M. V. Ionin,
S. I. Kudryashov,
D. V. Badikov,
G. K. Safaraliev

摘要

Abstract—

The efficiency of AgGaS₂, BaGa₄Se₇, and HgGa₂S₄ crystals has been investigated in a mid-IR frequency difference generator based on a femtosecond ytterbium fiber laser with a wavelength of 1.03 μm, pulse duration of 0.25 ps, pulse repetition rate of 10 kHz, and average radiation power of 5 W. It is shown that under the given experimental conditions the highest efficiency of difference-frequency generation (up to ~7.5%) is achieved with a HgGa₂S₄ crystal that provides 2 or 3 times higher energy of pulses with a wavelength of 4 to 7 μm (up to 6 μJ) without damaging it. In addition, this crystal yielded the longest wavelength of converted radiation—11 μm with pulse energy ~1 µJ.

The Conversion Efficiency of Femtosecond Ytterbium Fiber Laser Pulses to the Mid-IR Range in AgGaS2, BaGa4Se7, and HgGa2S4 Crystals

摘要

The Conversion Efficiency of Femtosecond Ytterbium Fiber Laser Pulses to the Mid-IR Range in AgGaS₂, BaGa₄Se₇, and HgGa₂S₄ Crystals