A convenient method to permanently adjust the operating frequency of a microstrip superconducting quantum interference device amplifier (MSA) was investigated. An optical laser cutter was used to ablate the input coil of an MSA, bonded to a printed circuit board (PCB), to increase the MSA's operational frequency. During the ablation process, the MSA did not have to be electrically or physically decoupled from the PCB. Using atomic force microscopy imaging, a cutting parameter of a single laser pulse of 1.8 mJ was found to ablate the 50-nm-thick input coil and 10 nm of the SiO$_{\bf 2}$ substrate beneath the input coil. After ablation, the bias current was unchanged and the gain of the MSA was relatively consistent, indicating that the ablation process does not affect the Josephson junctions. The resonant frequency of the input was adjusted from 180 to 270 MHz.

中文翻译：

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通过输入线圈的激光烧蚀调整 MSA 的谐振频率

研究了一种永久调整微带超导量子干涉器件放大器 (MSA) 工作频率的简便方法。使用光学激光切割机烧蚀 MSA 的输入线圈，该线圈连接到印刷电路板 (PCB)，以提高 MSA 的工作频率。在消融过程中，MSA 不必与 PCB 进行电气或物理分离。使用原子力显微镜成像，发现 1.8 mJ 的单个激光脉冲的切割参数可以烧蚀 50 nm 厚的输入线圈和输入线圈下方 10 nm 的 SiO$_{\bf 2}$ 衬底。消融后偏置电流不变，MSA的增益相对一致，说明消融过程不影响约瑟夫森结。