Monolithic, fiber-to-fiber coupled nonlinear resonator for brewster cut periodically poled crystals

A method of separating light wavelengths comprising the steps of:

• generating a first light beam directed at a cavity in optical alignment with an laser beam from the laser source, wherein the cavity comprises:
• two concave mirrors;
• and
• one or more Brewster-cut periodically poled crystals with a S-polarized component of the first light beam reflected off of a Brewster surface serving as a feedback signal for a servo locking of a cavity length to a first light frequency, wherein the servo locking is done at a high frequency.

A monolithic, nonlinear resonator comprising laser source:

• an infrared laser source that generates a first light beam;
• a cavity in optical alignment with the first light beam from the light source, wherein the cavity comprises:
• two concave mirrors;
• and
• one or more Brewster-cut periodically poled crystals with a S-polarized component of the first light beam reflected off of a Brewster surface serving as a feedback signal for a servo locking of a cavity length to a first light frequency, wherein the servo locking is done at a high frequency.