Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Präzisionsmessungen II
Q 24.6: Vortrag
Dienstag, 3. März 2009, 17:45–18:00, Audi-A
Microcavity spectroscopy and chip-scale frequency combs — •Pascal Del’Haye1, Olivier Arcizet1, Ronald Holzwarth1, and Tobias Kippenberg1,2 — 1Max-Planck-Institut für Qantenoptik, Garching bei München, Deutschland — 2Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
Optical frequency combs have revolutionized the ability to measure optical frequencies and posses a variety of applications ranging from molecular gas sensing to atomic clocks. In this talk, a novel, monolithic type of optical frequency comb generator is presented. The broadband frequency combs are generated in fused silica microtoroids, which can confine light for long times in extremely small mode volumes. High optical quality factors (Q>108) give rise to a power enhancement that enables the comb generation via four-wave mixing. The frequency combs are generated from a single CW laser source and exhibit mode spacings in the range of 1 THz down to less than 100 GHz, corresponding to the free spectral range of the resonator. Additionally, we demonstrate control over both offset frequency and mode spacing of the comb, enabling full stabilization of the comb to a microwave frequency reference. Owing to their large mode separation, microcavity combs are a perfect tool for applications like high capacity telecommunication and calibration of astrophysical spectrometers. Additionally, a novel spectroscopy method using an external cavity diode laser and a frequency comb is presented, enabling fast measurement of microcavity mode spectra at sub-MHz accuracy over a bandwidth exceeding 30 nm in the 1550 nm range.