Deep modulation of second-harmonic light by wavelength detuning of a laser diode

Mathias Christensen, Anders Kragh Hansen, Danny Noordegraaf, Ole Bjarlin Jensen, Peter M. W. Skovgaard

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Power modulated visible lasers are interesting for a number of applications within areas such as laser displays and medical laser treatments. In this paper, we present a system for modulating the second-harmonic light generated by single-pass frequency doubling of a distributed feedback (DFB) master oscillator power amplifier (MOPA) laser diode with separate electrical contacts for the MO and the PA. A modulation depth in excess of 97% from 0.1 Hz to 10 kHz is demonstrated. This is done by wavelength tuning of the laser diode using only a 40 mA adjustment of the current through the MO. The bandwidth of the modulation is limited by the electronics. This method has the potential to decrease the size as well as cost of modulated visible lasers. The achievable optical powers will increase as DFB MOPAs are further developed. (C) 2017 Optical Society of America
Original languageEnglish
JournalApplied Optics
Issue number8
Pages (from-to)2250-2254
Publication statusPublished - 2017


  • Atomic and Molecular Physics, and Optics
  • Feedback amplifiers
  • Frequency doublers
  • Modulation
  • Optical phase conjugation
  • Power amplifiers
  • Distributed feedback
  • Electrical contacts
  • Frequency-doubling
  • Master oscillator power amplifier lasers
  • Modulation depth
  • Second harmonics
  • Wavelength detuning
  • Wavelength tuning
  • Diodes


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