Performances of mid-IR high-power ZGP OPOs compared in non-planar ring resonators

We compared the performances of two mid-infrared non-planar ring ZGP OPO resonators, generating up to 30 W (RISTRA) and 27 W (FIRE). The beam quality is significantly improved from a value of M2 < 1.8 (RISTRA) to M2 < 1.4 (FIRE).