Developing an infrared APD array camera for near-infrared wavefront sensing
Developing an infrared APD array camera for near-infrared wavefront sensing
复制标题
开发用于近红外波前传感的红外 APD 阵列相机
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
P. Hinz
中科院分区：
文献类型：
--
作者：
A. Butko;S. Sivanandam;T. Hardy;Siqi Liu;Shaojie Chen;J. Véran;P. Hinz
我们将升级MMT天文台（MMTO）的自适应光学（AO）系统与一个新的金字塔波前传感器（PWFS）。我们的相机将利用列奥纳多的SAPHIRA，一个低读噪声电子雪崩光电二极管（eAPD）阵列。通过在近红外波段观测自然导星，我们将把MMTO的天空覆盖范围提高一个数量级。我们已经开发了一种紧凑的低温恒温器，利用Sunpower的CryoTel MT低温冷却器来减少SAPHIRA的暗电流和热背景辐射。我们的相机的冷却性能和低温冷却器引起的振动已经被量化，结果在这里呈现。在表征了我们的相机在各种反向偏置电压下的实验室性能后，该仪器将与MMTO的自适应光学系统集成。该波前传感器的成功实现将为未来在超大望远镜的AO系统中使用该技术铺平道路。
We will be upgrading the MMT Observatory’s (MMTO) Adaptive Optics (AO) system with a novel Pyramid Wavefront Sensor (PWFS). Our camera will utilize Leonardo’s SAPHIRA, a low-read-noise electron Avalanche Photodiode (eAPD) array. By observing natural guide stars in the near-infrared, we will improve the sky coverage at the MMTO by an order of magnitude. We have developed a compact cryostat that utilizes Sunpower’s CryoTel MT cryocooler to reduce the SAPHIRA’s dark current and thermal background radiation. Our camera’s cooling performance and cryocooler induced vibrations have been quantified and the results are presented here. Upon characterizing the laboratory performance of our camera at various reverse-bias voltages, this instrument will be integrated with MMTO’s adaptive optics system. The successful implementation of this wavefront sensor will pave the way for future applications using this technology in AO systems of extremely large telescopes.