HARMONI at ELT: mechanisms of the pre-optics at CDR

Suárez, Elvio Hernández; Luján, Alejandro; Martín, Yolanda Romano; Alonso, Ángel; García-Lorenzo, B.; Thatte, Niranjan; Schnetler, Hermine

doi:10.1117/12.2627518

Ground-Based and Airborne Instrumentation for Astronomy IX 2022

DOI: 10.1117/12.2627518

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HARMONI at ELT: mechanisms of the pre-optics at CDR

Elvio Hernández Suárez

Alejandro Luján

Yolanda Romano Martín

et al.

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Design and manufacture of athermalized optomechanical mounts for GRANCAIN, the infrared imaging instrument for GTC's adaptive optics

González Carretero,

Canto Caño,

Delgado Hernández

et al. 2024

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI

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GRANCAIN (GRAN CAmara INfrarroja) is a first-light imaging instrument in the infrared J, H and K bands that will be integrated into the adaptive optics focus of the Gran Telescopio de Canarias. The purpose of the instrument is to capture SWIR diffraction-limited images for a field of view of 22x22 arcsec. The instrument boasts a telecentric optical design with a collimator-camera configuration featuring a 2:1 magnification ratio. Housed within a 160-liter aluminum cryostat, its optical path includes a cold stop, a filter wheel, and a 4Mpx Hawaii-2 PACE Teledyne detector, meticulously engineered for operation at 77K. The optics is held in place by black anodized 6061-T6 aluminum supports. These mounts serve the critical purpose of precisely positioning the optics along the Z optical axis. The opto-mechanical frames contain adjustment elements in five degrees of freedom (all except the clock) for optical alignment and to compensate the thermal differential contractions that occur during the cooling-down process. Additionally, the lens-housing cell combines different geometries and materials with different coefficients of thermal expansion to avoid stresses on the glass so as not vary its relative position. A symmetrical and athermalized opto-mechanical design, free of residual stresses, helps to minimize the deviations of the optical axis and thus facilitates the iterative process of optical alignment in cryogenic conditions. A strict manufacturing and metrological control process were necessary in order to achieve the objectives for optimum image quality. The article contains a detailed description of the design, fabrication techniques, metrology, integration, alignment, and testing of the athermalized opto-mechanical elements.

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Design and manufacture of athermalized optomechanical mounts for GRANCAIN, the infrared imaging instrument for GTC's adaptive optics

González Carretero,

Canto Caño,

Delgado Hernández

et al. 2024

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI

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HARMONI at ELT: design and tests results of the instrument cryogenic fast shutter

Martín,

Hernandez Suarez,

Lujan González

et al. 2024

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI

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HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 470nm to 2450nm with resolving powers from 3300 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes -SCAO (including a High Contrast capability) and LTAO -or with NOAO. The project is preparing for Final Design Reviews.The core of HARMONI is the Integral Field Spectrograph (IFS) which is composed of different subsystems including the IFS Pre-Optics (IPO). The IPO main objective is to take light from the focal plane relay system and reformat and condition it to be a suitable input for the rest of the instrument. The IPO in HARMONI includes the IFS Pre-Optics Fast Shutter (POFS), a mechanical cryogenic fast shutter which will be used with both the visible and infrared detectors. This mechanism has been designed to be fast and reliable and its design has already passed the Critical Design Review (CDR) but specific issues that require further analysis have been identified. The functioning of this element is a critical part in HARMONI and, consequently, a prototype has been used to analyze possible improvements in the CDR design and to perform extensive testing before the Final Design Review (FDR).In this work we present the design of the IFS Pre-Optics Fast Shutter and the test results obtained with the prototype developed at the facilities of the Instituto de Astrofísica de Canarias (IAC).

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HARMONI at ELT: mechanisms of the pre-optics at CDR

Cited by 2 publications

References 2 publications

Design and manufacture of athermalized optomechanical mounts for GRANCAIN, the infrared imaging instrument for GTC's adaptive optics

Design and manufacture of athermalized optomechanical mounts for GRANCAIN, the infrared imaging instrument for GTC's adaptive optics

HARMONI at ELT: design and tests results of the instrument cryogenic fast shutter

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