Coherent addition of laser beams in resonant passive optical cavities

Year: 2010

Authors: Ferrari G., Catani J., Fallani L., Giusfredi G., Schettino G., Schäfer F., Cancio P.

Autors Affiliation: CNR – Istituto Nazionale di Ottica, Sezione Sesto Fiorentino, 50019 Sesto Fiorentino, Italy;
Laboratorio Europeo di Spettroscopie Nonlineari (LENS) and Dipartimento di Fisica ed Astronomia – Università di Firenze, 50019 Sesto Fiorentino, Italy

Abstract: An optical resonator, designed for frequency doubling of cw single-frequency radiation, is simultaneously injected by two phase-coherent laser beams with the same frequency. By using standard methods in laser-cavity stabilization, we are able to stabilize the cavity length on resonance with the laser, as well as the relative phase of the fundamental beams, to fulfill the optimum coupling conditions simultaneously on the two input couplers. By using this method, we generate reliably more than 220 mW of single-frequency radiation at 399 nm using two 0.5 W semiconductor tapered amplifiers at 798 nm. This method can be generalized to a larger number of input couplers and holds promise for improving the performances of extreme-UV frequency combs. (C) 2010 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 35 (18)      Pages from: 3105  to: 3107

More Information: We thank Maurizio De Rosa and Iolanda Riccardi for providing the resonator mechanical design, Barbara Michot of Leosolutions.it for lending some of the optical components used in the setup, and Paolo De Natale and Thomas Udem for useful discussions and for the critical reading of the manuscript. We are particularly grateful to Massimo Inguscio for scientific encouragement. We acknowledge funding through the projects European Union (EU) Atomic Quantum Technologies, Ministrero degli Affari Esteri-Sorgente di luce ultravioletta coerente, Istituto Italiano di Tecnologia-ENhanced COmputational REsources from individual atom control, and EUROQUAM Direct Quantum Simulation.
KeyWords: Cavity length; Coherent addition; CW single-frequency radiation; Frequency combs; Frequency-doubling; Input coupler; Optical cavities; Optimum coupling; Relative phase; Single-frequency; Standard method; Tapered amplifier; Two phase, Laser beams, Semiconductor lasers
DOI: 10.1364/OL.35.003105

Citations: 4
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