Kavli Affiliate: Long Zhang
| First 5 Authors: Guangzi Feng, Guangzi Feng, , ,
| Summary:
We report on a high-power mid-infrared femtosecond master oscillator power
amplifier (MOPA) system, employing Cr:ZnS and Cr:ZnSe polycrystals with
fine-tuned doping profiles. Based on the soft-aperture Kerr-lens mode-locking
in the soliton regime, the seed oscillator generates ~40-fs pulses with a
repetition rate ~173 MHz with an average power close to 400 mW. The
amplification process of the seed pulse train is investigated in depth in a
single-pass configuration for both Cr:ZnS and Cr:ZnSe crystal rods. For further
power scaling, a dual-stage MOPA system has been implemented, generating pulse
trains with an average power up to 10.4 W, limited only by the pump source,
with a re-compressed pulse duration of 78 fs using a dispersion compensator
comprising chirped mirrors and sapphire plates. This work paves the way for
further power scaling of mid-infrared Cr:ZnS/ZnSe ultrafast laser systems
without moving parts for applications in material processing, remote sensing
and medicine.
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