论文标题
二氧化硅平台上天文阵列的波导光栅的性能限制
Performance limits of astronomical arrayed waveguide gratings on silica platform
论文作者
论文摘要
我们介绍了一项数值和实验研究，该研究对相位误差对天文学应用的大型高分辨率波导光栅（AWG）的性能的影响。我们使用标量衍射模型来研究光波导长度随机变化的AWG的传输光谱。我们通过将光学波导的长度缩小到中心波长的最近整数倍数来模拟相误差校正。使用频域干涉法和干涉图强度的蒙特卡洛拟合测量自定义二氧化硅AWG的光学长度误差分布。最后，我们对使用最先进的技术制造的波导阵列的相位有限尺寸进行了估算。我们表明，后处理消除了相位误差，这是H波段中天文光谱的性能限制因素。
We present a numerical and experimental study of the impact of phase errors on the performance of large, high-resolution Arrayed Waveguide Gratings (AWG) for applications in astronomy. We use a scalar diffraction model to study the transmission spectrum of an AWG under random variations of the optical waveguide lengths. We simulate phase error correction by numerically trimming the lengths of the optical waveguides to the nearest integer multiple of the central wavelength. The optical length error distribution of a custom-fabricated silica AWG is measured using frequency-domain interferometry and Monte-Carlo fitting of interferogram intensities. In the end, we give an estimate for the phase-error limited size of a waveguide array manufactured using state-of-the-art technology. We show that post-processing eliminates phase errors as a performance limiting factor for astronomical spectroscopy in the H-band.
