Abstract
For the first time, a diode-pumped actively Q-switched Nd:YVO4/RbTiOPO4 (RTP) intracavity Raman laser at 1.49 µm was demonstrated to the best of our knowledge. Experimentally, a dual-end diffusion-bonded YVO4–Nd:YVO4–YVO4 crystal was employed as the laser medium to generate 1.34 µm laser radiation, and an RTP crystal as the Raman medium to enable the frequency conversion, by which radiation at 1.49 µm was achieved successfully. With an incident pump power of 10.4 W, an average output power of 502 mW was obtained at a pulse repetition rate of 15 kHz, corresponding to a conversion efficiency of 4.8%.
Highlights
The eye-safe lasers around 1.5 μm are of great importance for such kinds of potential applications, such as optical communications, optical sensing, lidar, and medicine [1,2,3]
RTP crystal is isomorphic with KTiOPO4 (KTP) crystal, which belongs to orthorhombic system, mm2 point group, and Pna21 space group [13,14,15]
High second-order nonlinear coefficient, and high damage threshold. It has been widely used in optical parametric oscillators [16,17], and high repetition rate electro-optically Q-switched lasers [18,19]
Summary
The eye-safe lasers around 1.5 μm are of great importance for such kinds of potential applications, such as optical communications, optical sensing, lidar, and medicine [1,2,3]. To generate the wavelengths that cannot be addressed directly, one has to resort to nonlinear frequency conversion technique. Stimulated Raman scattering, as an efficient method for laser frequency conversion, is quite promising for generating radiation in the eye-safe spectral region, because of the availability of suitable pumping laser and Raman crystal with required Raman frequency shift. RTP crystal is isomorphic with KTiOPO4 (KTP) crystal, which belongs to orthorhombic system, mm point group, and Pna space group [13,14,15]. It shows high resistivity, high second-order nonlinear coefficient, and high damage threshold.
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