Toward an AlGaAs/AlOx near-infrared integrated optical parametric oscillator
Toward an AlGaAs/AlOx near-infrared integrated optical parametric oscillator
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AlGaAs/AlOx 近红外集成光参量振荡器
DOI：
10.1364/josab.31.000542
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发表时间：
2014
影响因子：
1.9
通讯作者：
G. Leo
中科院分区：
文献类型：
--
作者：
C. Ozanam;M. Savanier;L. Lanco;X. Lafosse;G. Almuneau;A. Andronico;I. Favero;S. Ducci;G. Leo
我们报道了在选择性氧化AlGaAs腔中观察到的自放大参数下转换，该腔被设计为近红外导波光学参量振荡器。迄今为止，两个技术因素排除了这种振荡，并在这里进行了彻底的研究：氧化引起的光传播损耗和波导谐振腔面的反射率。前者的光谱研究指出了两种不同的机制：氧化物界面的散射和氧化物邻近层中点缺陷的吸收。对于后者，介质反射镜已被设计并沉积在脊状波导表面上，其模态反射率在泵浦波长为~ 10%，在信号/空闲波长为~ 90%。对于无反光镜波导的情况，单片腔使转换效率提高了2倍，这表明振荡阈值非常接近。
We report on the observation of self-amplified parametric downconversion in a selectively oxidized AlGaAs cavity that was designed to perform as a guided-wave optical parametric oscillator in the near infrared. To date, two technological factors preclude such oscillation and are thoroughly investigated here: oxidation-induced optical propagation losses and the reflectivity of the waveguide resonator facets. The spectral study of the former has singled out two distinct mechanisms: scattering at the oxide interfaces and absorption by point defects in the oxide neighboring layers. Regarding the latter, dielectric mirrors have been designed and deposited on the ridge waveguide facets, with modal reflectivities of ∼10% at pump wavelength and ∼90% at signal/idler wavelengths. With respect to the case of a mirrorless waveguide, the monolithic cavity enabled a factor-2 enhancement of the conversion efficiency, indicating the close proximity of the oscillation threshold.