KiCad boards from 4 GitHub repositories tagged “photonics”, the most starred first; open any of them in PCBKit.
gabrieldefreitasf/Laboratorio-de-Sensores-e-Instrumentacao
Repository for codes and design files related to an automated reflectometer. This project is made available in an open-source way and can be replicated.
WillMatthews/multi-smtpa
Eval board (various interesting layouts) for SMTPA socket ON Semiconductor SiPMs
WillMatthews/quad-sipm-fastcard
4 SiPMs on SMTPA eval board combined together using Signal Driven Multiplexing.
WillMatthews/sipm-smtpa-vary-anode-resist
single SMTPA eval board mount, with the ability to vary anode resistance if you like