量子情報通信などの分野で光通信波長帯における高量子効率単一光子検出器が求められている。光子波長変換器とSiアバランシフオトダイオードを組み合わせた検出法が期待されている。本研究では、光子波長変換器用の導波型擬似位相整合和周波発生デバイスを検討した。モード結合理論に基づくデバイスの性能予測、設計を行った。InGaAs半導体レーザによる励起で動作する和周波発生デバイスを試作し、光子波長変換を実現した。また、量子効率向上のために、導波路の結晶内埋込みを行い、量子効率30%を得ることができた。%High quantum efficiency single photon detector for communication wavelength band is required for applications including quantum information communications. A detection method utilizing a photon wavelength converter and a Si avalanche photodiode is promising. In this work, we studied waveguide quasi-phase-matching sum-frequency generation (QPM-SFG) devices for the photon wavelength converter. Based on the coupled-mode analysis, we studied the theoretical device performances and designed the devices. A prototype QPM-SFG device for pumping by an InGaAs semiconductor laser was fabricated and characterized, and photon wavelength conversion was demonstrated. For improvement of the quantum efficiency, a QPM-SFG device with a waveguide buried in the crystal was fabricated. A quantum efficiency of 30% was obtained.
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