We demonstrate a novel high-accuracy post-fabrication trimming technique to fine-tune the phase of integrated Mach–Zehnder interferometers, enabling permanent correction of typical fabrication-based phase errors. The effective index change of the optical
We investigate the optical response of silicon-based VxOy film for terahertz (THz) transmission. We find that absorption of the THz wave by the film can be controlled by laser excitation. Using THz time-domain spectroscopy (THz-TDS), we observe that the a
在极地环境(如南极Dome A)中的光学系统,氧化铟锡(ITO)薄膜加热除霜有突出的优势。简述了ITO 薄膜除霜原理,指出了目前采用的直流电、点状电极的加热设计存在局部过冷、电极过热、整体加热不均的情况,影响成像质量与除霜效果。给出了加热除霜效果的评估指标,提出了多相交流电、线状电极的新设计,并采用“主路径”分析法进行论证。然后以南极巡天望远镜(AST)为背景,对500 mm 口径镜面进行有限元模拟,在等功率条件下,对各加热设计进行评估。使用红外热像仪测量实际镜面:采用新设计后,镜面温度均方差降低了81.
High power diode array module has been fabricated. The epitaxial structure is an InGaAs/GaAsP strain compensated single quantum well. The laser bars are made with a filling factor of 84.6%. The module's quasi-continuous wave (100 microseconds, 1000 Hz) p
Wavelength conversion based on four-wave mixing (FWM) has been demonstrated using a 40-m dispersion flattened highly nonlinear photonic crystal fiber (HNL-PCF). A conversion efficiency of -26 dB for a pump power of 19.5 dBm and a conversion bandwidth of 2