Related Experiment Video
Updated: Jul 7, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Angle-tuned type II external-cavity frequency doubling without temperature stabilization
Y Emery1, A Fleischhauer, T Walther
1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA.
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.
Related Concept Videos
Design Example: Underdamped Parallel RLC Circuit
Starting with a fixed...
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Voltage Doubler Circuit
Standing Waves in a Cavity
Oscillations In An LC Circuit

