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Proceedings Paper

Remotely manageable system for stabilizing femtosecond lasers
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Paper Abstract

In the field of precise measurement of optical frequencies, laser spectroscopy and interferometric distance surveying the optical frequency synthesizers (femtosecond combs) are used as optical frequency references. They generate thousands of narrow-linewidth coherent optical frequencies at the same time. The spacing of generated components equals to the repetition frequency of femtosecond pulses of the laser. The position of the comb spectrum has a frequency offset that is derived from carrier to envelope frequency difference. The repetition frequency and mentioned frequency offset belong to main controlled parameters of the optical frequency comb. If these frequencies are electronically locked an ultrastable frequency standard (i.e. H-maser, Cs- or Rb- clock), its relative stability is transferred to the optical frequency domain. We present a complete digitally controlled signal processing chain for phase-locked loop (PLL) control of the offset frequency. The setup is able to overcome some dropouts caused by the femtosecond laser non-stabilities (temperature drifts, ripple noise and electricity spikes). It is designed as a two-stage control loop, where controlled offset frequency is permanently monitored by digital signal processing. In case of dropouts of PLL, the frequency-locked loop keeps the controlled frequency in the required limits. The presented work gives the possibility of long-time operation of femtosecond combs which is necessary when the optical frequency stability measurement of ultra-stable lasers is required. The detailed description of the modern solution of the PLL with remote management is presented.

Paper Details

Date Published: 1 May 2014
PDF: 6 pages
Proc. SPIE 9135, Laser Sources and Applications II, 913527 (1 May 2014); doi: 10.1117/12.2052815
Show Author Affiliations
Martin Cizek, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Vaclav Hucl, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Radek Smid, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Bretislav Mikel, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Josef Lazar, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Ondrej Cip, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 9135:
Laser Sources and Applications II
Jacob I. Mackenzie; Helena JelÍnková; Takunori Taira; Marwan Abdou Ahmed, Editor(s)

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