Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.
Opt Lett. 2013 Aug 1;38(15):2792-5. doi: 10.1364/OL.38.002792.
High-efficiency dynamic holography at 1.55 μm is demonstrated in a broad-area InGaAs/InP multiple-quantum-well vertical microcavity. The design places single quantum wells at the cavity antinodes, reducing mode-pulling and enabling a higher Q-factor. The device is pumped by interference fringes through an amorphous mirror that is transparent to a high-energy hologram writing pulse at a wavelength of 1.06 μm. Optically pumped free carrier gratings are probed by a tunable 1.5 μm laser in a four-wave mixing configuration. Diffraction efficiency into both m=±1 diffraction orders of 35% (70% total) has been obtained with a phase grating contribution approaching the maximum π phase shift by combining absorption bleaching with asymmetric Fabry-Perot reflectivity. The diffracted signal exhibits rise/fall times of 5 ns, demonstrating the high speed capabilities of this device.
在宽光域 InGaAs/InP 多量子阱垂直微腔中实现了 1.55 μm 高效动态全息术。该设计将单量子阱置于腔的波腹处，降低了模式牵引，实现了更高的 Q 因子。该器件通过对高能全息写入脉冲波长为 1.06 μm 的非晶态反射镜用干涉条纹进行泵浦。可调谐 1.5 μm 激光在四波混频配置中探测光泵浦的自由载流子光栅。通过将吸收漂白与非对称法布里-珀罗反射率相结合，实现了相位光栅贡献接近最大 π 相移，获得了 35%（总效率为 70%）的 m=±1 衍射级的衍射效率。衍射信号的上升/下降时间为 5 ns，证明了该器件的高速性能。
