Polarization-controlled hybrid laser with high-power, narrow-linewidth, and widely tunable NIR emission

We demonstrate a compact hybrid laser cavity that enables dynamic impedance matching via polarization control, which achieves high-power, narrow-linewidth, and widely tunable near-infrared (NIR) laser emission. By rotating the nonlinear crystal to distribute the parametric gain between orthogonal polarizations, low-loss intracavity oscillation for the p-polarized field and high-efficiency output for the s-polarized signal are simultaneously achieved, which resolves the inherent conflict in output coupling requirements between the Ti:sapphire population inversion and the optical parametric oscillator (OPO). At the same time, this mechanism also introduces a nonreciprocal gain to inherently suppress the backward propagation and realize the unidirectional laser operation without an optical isolator. The laser produces ns pulses tunable from 963.26 nm to 1003.32 nm. At 992 nm, it achieves a narrow linewidth of 169.5 MHz and an output power of 9.2 W under 52 W of total 532 nm pump power, which corresponds to an optical-to-optical conversion efficiency of 17.7%. This compact design operates without active mode control or external seed injection and offers a novel, to the best of our knowledge, pathway to high-performance tunable near-infrared lasers.