Patent ID: 6069903
Filing Date: 2000-05-30
Classification: G02F

Abstract:
A device for frequency conversion which is adjustable for optimizing resonator length, comprisinga ring resonator comprising a mirror and an optically non-linear crystal, andan annular piezo-adjuster located between the mirror and the crystal, the piezo-adjuster having a central opening to allow for passage of resonator radiation between the mirror and the crystal,the crystal being asymmetric, comprising three optically relevant faces A, B and C, entry face A having an antireflective coating, face B being optically polished, and face C having a highly reflective coating as a reflection face for a fundamental wave and an anti-reflective coating to thereby act as a de-coupling face for a second harmonic wave generated by the crystalwherein only one of either the mirror or the crystal is secured with respect to a stationary mount, such that a distance between the mirror and the crystal may be adjusted to optimize resonator length by applying a voltage to the piezo-adjuster to thereby cause an elongation of the piezo-adjuster.