| 摘要 |
A laser system that generates light in the mid-infrared (mid-IR) wavelength range is disclosed. The laser system includes an optical fiber laser having a thulium-doped optical fiber gain medium and that is configured to generate pump light having an optical power of greater than 50 W. The laser system also includes an optical parametric oscillator (OPO) arranged to receive the pump light and configured to generate therefrom, via spontaneous parametric downconversion, mid-IR-wavelength output light. A phase-matching tuning curve is used to select the pump wavelength that provides desired signal and idler wavelengths for the outputted signal and idler light. The laser system is capable of generating high-mode-quality 100 ns optical pulses with about 400 μJ energy at an average power greater than 5 W, in some cases up to several tens of Watts, and in some cases greater than 50 W at the pump wavelength.
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