Brewster mirror ultrafast optical parametric oscillator with high precision wavelength tuning

We demonstrate a synchronously-pumped optical parametric oscillator (OPO) with a cavity formed from high refractive index inverted prisms, also known as Brewster mirrors. Exploiting a single total internal reflection, this is the simplest device capable of deviating a laser beam by 180◦. The OPO produced a chirped signal output tunable from 1060 -1570~nm with a maximum power of 114 mW. We investigate the geometric properties of ideal and imperfect Brewster mirror prisms and find the latter can provide ~1000x finer control of the signal wavelength when compared to cavity length tuning.