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Proceedings Paper

Recent progress in mid-IR materials and lasers based on Cr and Fe doped chalcogenides (Conference Presentation)
Author(s): Sergey B. Mirov; Igor Moskalev; Sergey Vasilyev; Viktor Smolski; Mike Mirov; Vladimir Fedorov; Dmitri Martyshkin; Andrey Zakrevsky; Ozarfar Gafarov; Jeremy Peppers; Valentin Gapontsev
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Paper Abstract

II-VI chalcogenides (e.g. ZnSe/S) doped with transition metal (TM) ions such as Cr, and Fe are arguably the materials of choice for fabrication of effective mid-IR gain media. TM:II-VI materials feature a favorable blend of laser spectroscopic parameters: a four-level energy structure, absence of excited state absorption, close to 100% quantum efficiency of fluorescence (for Cr doped II-VI media), broad mid-IR vibronic absorption and emission bands. This talk summarizes progress in fabrication of high quality Cr:ZnS/Se and Fe:ZnS/Se by cation vacancy and cation interstitial enhanced post growth thermal diffusion. We also describe recent breakthrough on recrystallization and effective doping of ZnS ceramics under hot isostatic pressing resulting in a large cm-scale monocrystalline domains formation and an increase of the Fe diffusion coefficient by three orders of magnitude. We report recent advances in high-power Cr:ZnS/Se and Fe:ZnSe laser systems, enabling a wide range of tunability (1.8-5.0µm) with output power levels of up to 140 W near 2500 nm, 32 W at 2940 nm, and 35 W at 4300 nm with corresponding optical efficiencies of 62%, 29%, and 35%. Current improvements of output characteristics of polycrystalline Cr:ZnS/Se oscillators in Kerr-Lens-Mode-Locked (KLM) regime are reported: up to 2 W output power at 75-1200 MHz repetition rate, up to 2 cycle pulse duration (16 fs) with efficiency of 20-25% with regards to Er-fiber laser pump power. The effects of efficient up-conversion of mid-IR fs pulses in the laser medium as well as supercontinuum generation are demonstrated. Further extension of mid-IR spectral coverage to 3-8 m is demonstrated by Cr:ZnS KLM laser pumped degenerate (subharmonic) parametric oscillators (OPOs) based on based on quasi-phase matching in orientation-patterned gallium arsenide, and random phase matching in polycrystalline ZnSe.

Paper Details

Date Published: 14 May 2018
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Proc. SPIE 10637, Laser Technology for Defense and Security XIV, 106370V (14 May 2018); doi: 10.1117/12.2306528
Show Author Affiliations
Sergey B. Mirov, The Univ. of Alabama at Birmingham (United States)
IPG Photonics Corp. (United States)
Igor Moskalev, IPG Photonics - Mid-Infrared Lasers (United States)
Sergey Vasilyev, IPG Photonics - Mid-Infrared Lasers (United States)
Viktor Smolski, IPG Photonics - Mid-Infrared Lasers (United States)
Mike Mirov, IPG Photonics - Mid-Infrared Lasers (United States)
Vladimir Fedorov, The Univ. of Alabama at Birmingham (United States)
IPG Photonics - Mid-Infrared Lasers (United States)
Dmitri Martyshkin, The Univ. of Alabama at Birmingham (United States)
IPG Photonics - Mid-Infrared Lasers (United States)
Andrey Zakrevsky, IPG Photonics - Mid-Infrared Lasers (United States)
Ozarfar Gafarov, The Univ. of Alabama at Birmingham (United States)
Jeremy Peppers, IPG Photonics - Mid-Infrared Lasers (United States)
Valentin Gapontsev, IPG Photonics Corp. (United States)


Published in SPIE Proceedings Vol. 10637:
Laser Technology for Defense and Security XIV
Mark Dubinskiy; Timothy C. Newell, Editor(s)

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