Electrical Engineering Department, Technion, Haifa, 32000, Israel.
Opt Lett. 2010 May 1;35(9):1440-2. doi: 10.1364/OL.35.001440.
We report highly efficient four wave mixing in a GaInP photonic crystal waveguide. Owing to its large bandgap, the ultrafast Kerr nonlinearity of GaInP is not diminished by two photon absorption and related carrier effects for photons in the 1550 nm range. A four-wave-mixing efficiency of -49 dB was demonstrated for cw pump and probe signals in the milliwatt range, while for pulsed pumps with a peak power of 25 mW the conversion efficiency increased to -36 dB. Measured conversion efficiency dependencies on pump probe detuning and on pump power are in excellent agreement with a simple analytical model from which the nonlinear parameter gamma is extracted. Gamma scales approximately with the square of the slow down factor and varies from 800 W(-1) m(-1) at a pump wavelength lambda(p)=1532 nm to 2900 W(-1) m(-1) at lambda(p)=1550 nm. These values are consistent with those obtained from self phase modulation experiments in similar devices.
我们在 GaInP 光子晶体波导中报告了高效的四波混频。由于其大带隙，GaInP 的超快 Kerr 非线性不受双光子吸收和 1550nm 范围内光子的相关载流子效应的影响。在毫瓦级的连续波泵浦和探测信号中，实现了-49dB 的四波混频效率，而对于峰值功率为 25mW 的脉冲泵浦，转换效率增加到-36dB。测量的转换效率对泵浦-探测失谐和泵浦功率的依赖性与一个简单的分析模型非常吻合，从该模型中提取出非线性参数γ。γ大约与慢化因子的平方成正比，在泵浦波长λ（p）=1532nm 时为 800W(-1)m(-1)，在λ（p）=1550nm 时为 2900W(-1)m(-1)。这些值与在类似器件中自相位调制实验获得的值一致。
