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Proceedings Paper

Analysis of frequency noise properties of 729nm extended cavity diode laser with unbalanced Mach-Zehnder interferometer
Author(s): Tuan M. Pham; Martin Čížek; Václav Hucl; Josef Lazar; Jan Hrabina; Šimon Řeřucha; Adam Lešundák; Petr Obšil; Radim Filip; Lukáš Slodička; Ondřej Číp
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Paper Abstract

We report on the frequency noise investigation of a linewidth-suppressed Extended Cavity Diode Laser (ECDL), working at 729 nm. Since the ECDL is intended as an excitation laser for the forbidden transition in a trapped and laser cooled 40Ca+ ion, an Hz-level linewidth is required. We present the experimental design that comprises a two-stage linewidth narrowing and a facility for frequency and noise analysis. The linewidth is first narrowed with a phase lock loop of the ECDL onto a selected component of an optical frequency comb where the frequency noise was suppressed with a fast electronic servo-loop controller that drives the laser injection current with a high bandwidth. The second stage comprises locking the laser onto a selected mode of a high-finesse passive optical cavity. The frequency analysis used an unbalanced Mach-Zehnder interferometer with a fiber spool inserted in the reference arm in order to give a general insight into the signal properties by mixing two separated beams, one of them delayed by the spool, and processing it with a spectral analyzer. Such a frequency noise analysis reveals what are the most significant noises contributions to the laser linewidth, which is a crucial information in field of ion trapping and cooling. The presented experimental results show the effect of the linewidth narrowing with the first stage, where the linewidth of ECDL was narrowed down to a kHz level.

Paper Details

Date Published: 23 December 2016
PDF: 5 pages
Proc. SPIE 10142, 20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 101420E (23 December 2016); doi: 10.1117/12.2264455
Show Author Affiliations
Tuan M. Pham, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Martin Čížek, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Václav Hucl, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Josef Lazar, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Jan Hrabina, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Šimon Řeřucha, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Adam Lešundák, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Petr Obšil, Palacký Univ. (Czech Republic)
Radim Filip, Palacký Univ. (Czech Republic)
Lukáš Slodička, Palacký Univ. (Czech Republic)
Ondřej Číp, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 10142:
20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Jarmila Müllerová; Dagmar Senderáková; Libor Ladányi; Ľubomír Scholtz, Editor(s)

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