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24 March 2017 Cryogenic application of an autocentering mount working at the diffraction limit
Beatriz S. Sánchez, Ana Carolina Keiman, Jorge Fuentes-Fernández, Salvador Cuevas Cardona, Carlos Espejo, Oscar Chapa, Rubén A. Flores-Meza, Luis Carlos Álvarez-Núñez, Gerardo Lara, José Leonardo Garcés Medina
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Optical Engineering, Vol. 56, Issue 3, 034114 (March 2017). https://doi.org/10.1117/1.OE.56.3.034114
Abstract
We present the design concept and validation of a cryogenic lens mount for a noncemented doublet for the near-infrared diffraction limited instrument FRIDA. The design uses an autocentering mount that maintains the relative alignment of the lenses, acting against any displacement that may be induced by external forces by automatically returning the lenses to their nominal positions. Autocentering techniques have been used for instruments at room temperature with relatively relaxed image quality requirements. We present in detail its application to a mount for a cryogenic instrument working at the diffraction limit. The design has been tested on the collimator of FRIDA, a noncemented doublet of CaF2 and S-FTM16. We describe the alignment requirements of the system, and we show the calculations that ensure that the lenses will suffer both appropriate stresses and temperature differences. We present the experimental validation of a prototype, demonstrating that the design delivers an excellent performance without inducing unnecessary stresses on the optical components, provided that the lenses are previously aligned with very high precision.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Beatriz S. Sánchez, Ana Carolina Keiman, Jorge Fuentes-Fernández, Salvador Cuevas Cardona, Carlos Espejo, Oscar Chapa, Rubén A. Flores-Meza, Luis Carlos Álvarez-Núñez, Gerardo Lara, and José Leonardo Garcés Medina "Cryogenic application of an autocentering mount working at the diffraction limit," Optical Engineering 56(3), 034114 (24 March 2017). https://doi.org/10.1117/1.OE.56.3.034114
Received: 23 January 2017; Accepted: 7 March 2017; Published: 24 March 2017
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KEYWORDS
Cryogenics
Collimators
Diffraction
Reticles
Lens design
Image quality
Telescopes
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