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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 12 — Jun. 16, 2014
  • pp: 14559–14567

Pump frequency noise coupling into a microcavity by thermo-optic locking

Jiang Li, Scott Diddams, and Kerry J. Vahala  »View Author Affiliations

Optics Express, Vol. 22, Issue 12, pp. 14559-14567 (2014)

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As thermo-optic locking is widely used to establish a stable frequency detuning between an external laser and a high Q microcavity, it is important to understand how this method affects microcavity temperature and frequency fluctuations. A theoretical analysis of the laser-microcavity frequency fluctuations is presented and used to find the spectral dependence of the suppression of laser-microcavity, relative frequency noise caused by thermo-optic locking. The response function is that of a high-pass filter with a bandwidth and low-frequency suppression that increase with input power. The results are verified using an external-cavity diode laser and a silica disk resonator. The locking of relative frequency fluctuations causes temperature fluctuations within the microcavity that transfer pump frequency noise onto the microcavity modes over the thermal locking bandwidth. This transfer is verified experimentally. These results are important to investigations of noise properties in many nonlinear microcavity experiments in which low-frequency, optical-pump frequency noise must be considered.

© 2014 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(140.6810) Lasers and laser optics : Thermal effects
(140.3325) Lasers and laser optics : Laser coupling
(140.3945) Lasers and laser optics : Microcavities

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 10, 2014
Revised Manuscript: May 30, 2014
Manuscript Accepted: May 30, 2014
Published: June 5, 2014

Jiang Li, Scott Diddams, and Kerry J. Vahala, "Pump frequency noise coupling into a microcavity by thermo-optic locking," Opt. Express 22, 14559-14567 (2014)

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