Frida integral field unit opto-mechanical design

摘要

FRIDA (inFRared Imager and Dissector for the Adaptive optics system of the Gran Telescopio Canarias) has beendesigned as a cryogenic and diffraction limited instrument that will offer broad and narrow band imaging and integralfield spectroscopy (IFS). Both, the imaging mode and IFS observing modes will use the same Teledyne 2Kx2K detector.This instrument will be installed at Nasmyth B station, behind the GTC Adaptive Optics system. FRIDA will provide theIFS mode using a 30 slices Integral Field Unit (IFU). This IFU design is based on University of Florida FISICA wherethe mirror block arrays are diamond turned on monolithic metal blocks.FRIDA IFU is conformed mainly by 3 mirror blocks with 30 spherical mirrors each. It also has a Schwarzschild relaybased on two off axis spherical mirrors and an afocal system of two parabolic off axis mirrors. Including two insertionmirrors the IFU holds 96 metal mirrors.Each block or individual mirror is attached on its own mechanical mounting. In order to study beam interferences withmechanical parts, ghosts and scattered light, an iterative optical-mechanical modeling was developed. In this work thisiterative modeling is described including pictures showing actual ray tracing on the opto-mechanical components.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.