13 May 2016 Mid-IR Kerr-lens mode-locked polycrystalline Cr2+:ZnS lasers
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This paper summarizes recent improvements of output characteristics of polycrystalline Cr:ZnS/Se master oscillators in Kerr-Lens-Mode-Locked regime: 1.9 W average power at 41 fs pulse duration, 24 nJ pulse energy and 515 kW peak power with efficiency of 19% with regards to 1567 nm pump power from linearly polarized Er-fiber laser. A simple design of mid-IR fs Cr:ZnS MOPA enabled power scaling to 6.8 W at 79 MHz repetition rate. This was accompanied by a 2 fold spectral broadening to 600 nm at -10 dB level, pulse compression from 44 to <30 fs, and overall 25 % optical to optical efficiency. Improved dispersion management of the resonator enabled pulse duration of Cr:ZnS master oscillator approaching 2 optical cycles (<26 fs) and 500 nm (27 THz) bandwidth of the spectrum at half-maximum. Further improvements of the optical coatings will result in octave-spanning polycrystalline Cr2+:ZnS/ZnSe lasers. In this work we also report on recent progress in spinning ring gain element technology and show new unprecedented output power levels for Cr:ZnSe laser gain media: ~140 W at 2400-2500 nm spectral range and ~32 W at 2940-2950 nm in CW regime of operation. High gain of the spinning ring Cr:ZnSe power amplifier demonstrated in this work may potentially enable scaling up the femtosecond mid-IR Cr:ZnS MOPA up to 70-100W.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sergey Vasilyev, Sergey Vasilyev, Igor Moskalev, Igor Moskalev, Mike Mirov, Mike Mirov, Sergey Mirov, Sergey Mirov, Valentin Gapontsev, Valentin Gapontsev, "Mid-IR Kerr-lens mode-locked polycrystalline Cr2+:ZnS lasers", Proc. SPIE 9835, Ultrafast Bandgap Photonics, 98350W (13 May 2016); doi: 10.1117/12.2223828; https://doi.org/10.1117/12.2223828


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