Kinetics of excitation transfer from Cr2+ to Fe2+ ions in co-doped ZnSe

Article Materials Science, Multidisciplinary

Amplification properties of polycrystalline Fe:ZnSe crystals for high power femtosecond mid-IR laser systems

E. A. Migal et al.

Summary: In this Letter, a multi-pass amplifier based on a polycrystalline Fe:ZnSe element grown by the CVD method and doped through diffusion technique is realized with output energy of more than 3 mJ at 4.5 mu m. The crystal demonstrates small-signal gain per pass of 5.7 and upper-level lifetime of 670 +/- 10 ns under moderate cooling, making it very attractive for mid-IR femtosecond multi-pass amplifiers and generators. Properties of the polycrystalline Fe:ZnSe elements grown by CVD and doped through diffusion and CVD methods with higher Fe ions concentration are also studied and compared with a single crystal element.

OPTICAL MATERIALS (2021)

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Article Optics

Gain-switched laser operation of Cr2+,Fe2+:Zn1-xMgxSe (x ≈ 0.2; x ≈ 0.3) single crystals under Cr2+ → Fe2+ energy transfer at ∼1.73 μm and direct Fe2+ ions excitation at ∼2.94 μm

A. Riha et al.

Summary: The novel Zn1-xMgxSe (x approximately 0.2 and x approximately 0.3) single crystals co-doped with Cr2+ and Fe2+ ions were studied. Excitation was performed through energy transfer from Cr2+ to Fe2+ ions and direct Fe2+ ion excitation. The crystals with higher magnesium content had broader absorption bands with peaks shifted towards longer wavelengths, and similar fluorescence spectra were observed for both excitation methods. However, differences were observed in fluorescence decay time measurements and delay times between pump and fluorescence signals.

JOURNAL OF LUMINESCENCE (2021)

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Article Optics

Compact OPCPA system seeded by a Cr:ZnS laser for generating tunable femtosecond pulses in the MWIR

Pia Fuertjes et al.

Summary: A compact MWIR OPCPA system generates sub-150 fs pulses at wavelengths from 5.4 to 6.8 μm, with potential applications in ultrafast mid-infrared nonlinear optics and spectroscopy.

OPTICS LETTERS (2021)

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Article Optics