Orthogonal Control of Femtosecond Mode-Locked Laser Having Zero Carrier-Offset Frequency with Three-Axis PZT

Tai Hyun Yoon, Seong Tae Park, Eok Bong Kim, Jin Yong Yeom

Research output: Contribution to journalArticle

5 Citations (Scopus)


The authors demonstrate an optical frequency synthesizer based on a femtosecond (fs) mode-locked Ti:sapphire (Ti:s) laser by simultaneously stabilizing the carrier-offset frequency fceo and repetition rate frep, referenced to the Cs atomic frequency standard. By using two wide-band digital phase-detectors they realize a phase-coherent link between frep and fceo with the relation fceo = f AOM - 5/6frep ≡ 0, where fAOM = 5/6f rep is the phase-locked driving frequency of an acousto-optic modulator in a self-referencing interferometer and frep = 100 MHz. For the simultaneous control of frep and fceo, an orthogonalization scheme using a three-axis piezoelectric transducer is introduced by which the end mirror of fs laser is controlled. As a result, the authors could stabilize all components of the fs laser comb at once with an equal frequency separation frep = 100 MHz with fceo = 0. In their optical frequency synthesizer, the frequency of the nth component (fn) is given exactly by the simple relation fn = nf rep, enabling them to use the fs laser comb as a frequency ruler in the optical frequency metrology.

Original languageEnglish
Pages (from-to)1025-1029
Number of pages5
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
Publication statusPublished - 2003 Jul 1
Externally publishedYes



  • Femtosecond laser
  • Optical comb
  • Optical frequency synthesizer
  • Phase locking

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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