Mid-IR gain media based on transition metal-doped II-VI chalcogenides

Progress in fabrication and mid-IR lasing of Cr and Fe thermal-diffusion and radiation enhanced thermal diffusion doped II-VI binary and ternary polycrystals is reported. We demonstrate novel design of mid-IR Fe:ZnSe and Cr:ZnSe/S solid state lasers with significant improvement of output average power up to 35W@4.1 μm and 57W@2.5 μm and 20W@2.94 μm. We report significantly improved output characteristics of polycrystalline Cr:ZnS/Se lasers in gain-switched regime: 16 mJ at 200 Hz, pulse duration 5 ns with tunability over 2400-3000 nm as well as Kerr-Lens-Mode-Locked regime in terms of average power (up to 2 W), peak power and pulse energy (0.5 MW and 24 nJ, respectively), and pulse duration (less than 29 fs).

[1]  Valentin Gapontsev,et al.  Mid-IR Kerr-Lens Mode-Locked Polycrystalline Cr 2+ :ZnS Laser with 0.5 MW Peak Power , 2015 .

[2]  S. Unger,et al.  Advanced configuration of erbium fiber passively Q-switched laser with Co/sup 2+/:ZnSe crystal as saturable absorber , 2004, IEEE Photonics Technology Letters.

[3]  Sudhir B. Trivedi,et al.  Comparison of the optical properties of diffusion-doped polycrystalline Cr:ZnSe and Cr:CdTe windows , 2006 .

[4]  Vladimir V. Fedorov,et al.  Mid-IR lasing of iron–cobalt co-doped ZnS(Se) crystals via Co–Fe energy transfer , 2013 .

[5]  T. Allen,et al.  RADIATION-ENHANCED DIFFUSION AND RADIATION-INDUCED SEGREGATION , 2007 .

[6]  Valentin Gapontsev,et al.  Three optical cycle mid-IR Kerr-lens mode-locked polycrystalline Cr(2+):ZnS laser. , 2015, Optics letters.

[7]  Ralph H. Page,et al.  Transition metal-doped zinc chalcogenides: Spectroscopy and laser demonstration of a new class of gain media , 1996 .

[8]  N. Kuleshov,et al.  Saturable absorbers for passive Q-switching of erbium lasers emitting in the region of 3 μm , 2005 .

[9]  Sylvain Girard,et al.  Accurate method for the measurement of absorption cross sections of solid-state saturable absorbers , 2002 .

[10]  Vladimir V. Fedorov,et al.  Characterization of cobalt doped ZnSe and ZnS crystals as saturable absorbers for alexandrite lasers , 2006, SPIE LASE.

[11]  S. Mirov,et al.  A fiber pumped Er:YAG laser passively Q-switched by Co:ZnS and Cr:ZnSe crystals , 2014 .

[12]  David E. Zelmon,et al.  Thermal diffusion of Cr2+ in bulk ZnSe , 2002 .

[13]  Sihua Li,et al.  A cobalt-doped transparent glass ceramic saturable absorber Q-switch for a LD pumped Yb3+/Er3+ glass microchip laser , 2010 .

[14]  Umit Demirbas,et al.  Synthesis and characterization of diffusion-doped Cr2+:ZnSe and Fe2+:ZnSe , 2006 .

[15]  Valentin Gapontsev,et al.  Kerr-lens mode-locked femtosecond polycrystalline Cr2+:ZnS and Cr2+:ZnSe lasers. , 2014, Optics express.

[16]  H. Mehrer.  Diffusion in solids : fundamentals, methods, materials, diffusion-controlled processes , 2007 .

[17]  Zygmunt Mierczyk,et al.  ZnSe:Co2+—nonlinear optical absorber for giant-pulse eye-safe lasers , 2003 .

[18]  Vladimir V. Fedorov,et al.  Iron-doped CdxMn1−xTe crystals for mid-IR room-temperature lasers , 2008 .