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We demonstrated the concept of anisotropic off-axis laser oscillator through stimulated Raman scattering and generated the octave-spanning supercontinuum, containing two spectral groups between 540~750 and 1095~1800 nm, in a monolithic KTP crystal.

We report generation of octave-spanning supercontinuum from a high-gain, ultra-broadband, and mirrorless Raman oscillator in a monolithic KTP crystal. The supercontinuum output contains two spectral groups between 540~750 and 1095~1800 nm.

We report generation of a visible and near-infrared supercontinuum from a high-gain, ultra-broadband, and mirrorless Raman oscillator in a monolithic KTP crystal. The plane transverse to the pump axis resonates and traps off-axis Stokes waves and their frequency-upconverted components bouncing between two crystal surfaces via total internal reflection. The Raman gain is maximized with the Stokes polarization perpendicular to the plane of reflections. When pumped by a Q -switched Nd:YAG laser, the monolithic oscillator generates quasi-mode-locked Stokes pulses with octave-spanning spectral groups across the visible and near-infrared spectra between 540 and 1800 nm.

By exploiting the anisotropic radiation pattern of an elementary dipole in a laser material, we report a gain enhancement factor of 1.3104 for an off-axis Raman laser in a monolithic y-cut versus z-cut KTP crystal.

We report tunable narrow-line high-power far-infrared radiation between 3-6 THz from off-axis parametric oscillators using lithium niobate and KTP as gain crystals. We measured tens of kW power at 5.7 THz in an ~80 ps width.