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

Kenichi Hirosawa; Fumio Shohda; Takayuki Yanagisawa; Fumihiko Kannari

doi:10.1117/12.2078796

26 March 2015 In-phase synchronization of array laser using intra-Talbot-cavity second harmonic generation

Kenichi Hirosawa, Fumio Shohda, Takayuki Yanagisawa, Fumihiko Kannari

Proceedings Volume 9342, Solid State Lasers XXIV: Technology and Devices; 934217 (2015) https://doi.org/10.1117/12.2078796
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

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:YVO₄planar 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.

Citation Download Citation

Kenichi Hirosawa, Fumio Shohda, Takayuki Yanagisawa, and Fumihiko Kannari "In-phase synchronization of array laser using intra-Talbot-cavity second harmonic generation", Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 934217 (26 March 2015); https://doi.org/10.1117/12.2078796

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