Applied Physics B

, Volume 55, Issue 3, pp 216–225

Squeezing by second-harmonic generation in a monolithic resonator


  • P. Kürz
    • Universität Konstanz
  • R. Paschotta
    • Universität Konstanz
  • K. Fiedler
    • Universität Konstanz
  • A. Sizmann
    • Universität Konstanz
  • G. Leuchs
    • Universität Konstanz
  • J. Mlynek
    • Universität Konstanz
Generation of CW Squeezed Light

DOI: 10.1007/BF00325009

Cite this article as:
Kürz, P., Paschotta, R., Fiedler, K. et al. Appl. Phys. B (1992) 55: 216. doi:10.1007/BF00325009


We have measured the intensity fluctuations of the second-harmonic mode generated in a MgO:LiNbO3 external monolithic cavity pumped by a Nd:YAG laser. The cavity has mirror coatings for both the fundamental and the second-harmonic mode. We scan the cavity using the electro-optic effect of the crystal and observe that the second-harmonic beam of 2 mW exhibits a quantum noise reduction of 40(±5)%. In addition, we report on the active frequency stabilization of the monolithic device used in our squeezing experiments. Several fast tuning parameters such as the electro-optic effect, the photo-elastic effect, and the laser frequency have been investigated. With these tuning parameters the monolithic resonator can be locked on double-resonance at the phase-matching temperature, which is a prerequisit for observing squeezing in a cw-regime.


Download to read the full article text

Copyright information

© Springer-Verlag 1992