title: Angle-tuned type II external-cavity frequency doubling without temperature stabilization.
abstract: We report frequency doubling of a low-power cw diode laser at 1064 nm in an external ring cavity by use of an angle-tuned KTP type II crystal. We demonstrate a new setup that requires no temperature stabilization of the crystal. An intracavity lambda/2 plate rotates the polarization of the fundamental after each cavity round trip by 90 degrees; this provides the two eigenpolarizations of the crystal required for a type II nonlinear process. As a result, it is possible to maintain the resonance condition by use of a standard locking circuit.
authors.affiliation: Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Emery
authors.forename: A
authors.initials: A
authors.lastname: Fleischhauer
authors.forename: T
authors.initials: T
authors.lastname: Walther
authors.forename: E S
authors.initials: ES
authors.lastname: Fry