In-phase synchronization of array laser using intra-Talbot-cavity second harmonic generation

Kenichi Hirosawa, Fumio Shohda, Takayuki Yanagisawa, Fumihiko Kannari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Talbot cavity is passive method to synchronize the phase of array lasers. Because the Talbot cavity does not need any electrical feedback systems, we believe that Talbot cavity is the most suitable technique to combine a considerable number of laser array into a compact system. A well-known drawback of the Talbot cavity is that it can produce out-phased array and their far-field image has 2-peak profile. To solve this drawback, we developed a frequency doubled laser array based on intra-Talbot-cavity second harmonic generation. Basic concept is second harmonic generation of the out-phased array generated from the Talbot cavity. Because the second harmonic wave is generated proportionally to the square of the fundamental wave, out-phase flips to in-phase. Our Talbot cavity is composed of a pumping 808-nm laser diode array with 15 emitters, an Nd:YVO4 planar waveguide, a PPLN planar waveguide, an f =10 cylindrical lens, and an output coupler (high reflection for 1064 nm and high transition to 532 nm). The pump laser beams are directly launched into the Nd:YVO4. The fundamental wave (1064 nm) oscillates between the Nd:YVO4 and the output coupler and generates second harmonic wave (532 nm) at the PPLN placed next to the Nd:YVO4. The round-trip optical path of the cavity length is set to 1/2 Talbot length so that Talbot cavity forms for the fundamental wave. As a result, we obtained 1-peak far-field image of second harmonic wave from the intra-Talbot-cavity second harmonic generation.

Original languageEnglish
Title of host publicationSolid State Lasers XXIV
Subtitle of host publicationTechnology and Devices
EditorsW. Andrew Clarkson, Ramesh K. Shori
ISBN (Electronic)9781628414325
Publication statusPublished - 2015
EventSolid State Lasers XXIV: Technology and Devices - San Francisco, United States
Duration: 2015 Feb 82015 Feb 10

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherSolid State Lasers XXIV: Technology and Devices
Country/TerritoryUnited States
CitySan Francisco


  • Laser arrays
  • Talbot and self-imaging effects
  • Waveguide lasers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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