Shared mirror resonator design for easy frequency tuning of THz lasers

We demonstrate novel resonator design for THz lasers based on stimulated polariton scattering (SPS). Frequency tuning of SPS lasers requires adjustable crossing angle between the non-collinear fields at fundamental and Stokes wavelengths, which is especially challenging in surface emitting geometries. Our shared mirror resonator design utilizes a mirror shared between fundamental and Stokes cavities to automatically fix their overlap region within a SPS crystal. Robust and repeatable tuning is achieved by rotation of a single mirror.