Frequency doubling of a fibre-amplified 1083 nm DBR laser

Year: 1998

Authors: Knight D.J.E., Minardi F., De Natale P., Laporta P.

Autors Affiliation: European Laboratory for Nonlinear Spectroscopy (LENS) and Istituto Nazionale per la Fisica della Materia (INFM), Largo E. Fermi 2, 50125 Firenze, Italy;
Dipartimento di Fisica, Università di Pisa, Piazza Torricelli 2, 56126 Pisa, Italy;
Istituto Nazionale di Ottica (INO), Largo E. Fermi 6, 50125 Firenze, Italy;
Istituto Nazionale per la Fisica della Materia (INFM) and Dipartiment di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milano, Italy

Abstract: A good frequency standard is required at 1083 nm for measurements on the fine structure of helium and of the fine structure constant. Several milliwatts of CW frequency-doubled light offers the prospect of stabilisation to a Doppler-free hyperfine transition in molecular iodine. The 1083 nm emission of an extended-cavity DBR diode laser has been amplified using an ytterbium-doped fibre amplifier, and applied to a type-I phase matched Mg:LiNTbO3 crystal in a high-Q fundamental-resonant cavity for frequency doubling. The amplifier gain at 1083 nm under typical operating conditions was 13.8 dB, with a coherent output power up to 63 mW, limited by the maximum signal input power. The doubling cavity Q was similar to 2 x 10(7), and about 70% of the incident power was coupled in. The maximum 2nd-harmonic conversion efficiency exceeded 20% and provided an output power of 3.7 mW for making continous frequency scans of up to 600 MHz in the green. All optical spectrum analyser at 541.5 nm showed fringes of 4.6 MHz full width half maximum, close to the instrumental width.

Journal/Review: EUROPEAN PHYSICAL JOURNAL D

Volume: 3 (3)      Pages from: 211  to: 216

KeyWords: Ytterbium-doped fiber; ND-YAG LAaser; 2nd-harmonic generation; Absolute frequency; Molecular-iodine
DOI: 10.1007/s100530050167

Citations: 7
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