A Small Actively Controlled High-resolution Spectrograph Based on Off-the-shelf Components

Abstract We present the design and testing of a prototype in-plane echelle spectrograph based on an actively controlled fiber-fed double-pass design. This system aims to be small efficient with minimum number optical surfaces—currently collimator/camera lens, cross-dispersing prism, grating reflector send light detector. It is built from catalog components has dimensions approximately 20 × 30 cm. works in regime resolution >70,000. The fed by bifurcated fiber one telescope other used provide simultaneous Thorium Argon illumination for wavelength calibration. positions arc lines detector are processed real time commercial auto-guiding software treat as guide stars. guiding sends any required adjustments mechanical piezo-electric actuators which move mirror sending camera removing drift position lines. current configuration using sCMOS provides precision 3.5 milli-pixels equivalent 4 m s −1 standard laboratory environment.