科研之友
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摘要
A mid-infrared YVO4 Raman laser intracavity-pumped by a diode-pumped actively Q-switched Tm:YAP laser at 1990 nm is demonstrated for the first time. An a-cut 30-mm-long YVO4 crystal is utilized in the Raman laser as a gain medium. With an incident diode pump power of 10.9 W, an average output power of 272 mW at the first Stokes wavelength of 2418 nm is obtained at a pulse repetition rate (PRR) of 1 kHz. The optical conversion efficiency from the diode pump to the first Stokes is about 2.5%. The corresponding pulse width and single pulse energy of the first Stokes are 15 ns and 0.27 mJ, respectively. Compared with the spectrum of the fundamental laser at 1990 nm, the output spectrum of the first Stokes at 2418 nm has a broader linewidth of approximately 10 nm.
