Cryogenic performance and long-term stability of metal optics and optical systems

Robichaud, Joseph L.; Wang, Dexter; Mastandrea, Andrew A.

doi:10.1117/12.317261

Cited by 5 publications

(2 citation statements)

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“…The conservation of optical elements surface's flatness also remains a critical parameter for interferometric cavities adapted to extended IR beams. The use of metal mirrors provides excellent conservation of wavefront flatness even under repeated cryocycling [6]. The Cryo-FTS presented in this paper consists of a Michelson interferometer as it would operate in the MDXR.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a cryogenic Michelson interferometer

Lagueux¹,

Chamberland²,

Marcotte³

et al. 2007

SPIE Proceedings

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A cryogenic Fourier transform infrared spectrometer (Cryo-FTS) was developed for the Low Background Infrared (LBIR) facility at the National Institute of Standards and Technology (NIST). This spectrometer was developed for the Missile Defense Agency Transfer Radiometer (MDXR) that will be used to calibrate infrared sources that can not be transported to NIST for calibration. When used inside the MDXR, the Cryo-FTS is expected to be able to provide relative spectral measurements with an accuracy of < 0.3 % uncertainty of infrared sources with a spectral range from 4 µm to 15 µm and a spectral resolution of 0.6 cm -1 .The Cryo-FTS spectral range is determined by the beamsplitter since all of its other optics use reflective materials. The compact interferometer uses a compensated Michelson configuration and has an operating temperature range between 10 K and 340 K with very low static beam redirection (< 215 µrad). The interferometer uses flat metal mirrors and KBr flat optics and maintains low wavefront distortion for infrared beams of up to 1.63 cm diameter. It integrates a digitally servo-controlled porchswing mechanism to provide an accurate and repeatable optical path difference and is supported by a Wavefront Alignment (WA) system to correct for wavefront residual tilt in real time using a fibre optic based metrology system. The interferometer is expected to provide modulation efficiency of better than 22% with limited power dissipation (< 2.8 W) during continuous operation.

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Section: Introductionmentioning

confidence: 99%

Design and development of a cryogenic Michelson interferometer

Lagueux¹,

Chamberland²,

Marcotte³

et al. 2007

SPIE Proceedings

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“…There are several effects which lead to a change of the substrate shape (dimensional instability) and thus, of the optical surfaces. Dimensional instabilities are divided into three types: long-term, thermal cycling, and thermal [23][24][25][26][27][28][29][30][31][32]. Long-term instabilities are time dependent effects, like diffusion, phase transitions and stress relaxation of the materials used.…”

Section: Introductionmentioning

confidence: 99%

Theoretical compensation of static deformations of freeform multi mirror substrates

Hartung,

von Lukowicz,

Kinast

2018

Preprint

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Varying temperatures influence the figure errors of freeform metal mirrors by thermal expansion. Furthermore, different materials lead to thermo-elastic bending effects. The article presents a derivation of a compensation approach for general static loads. Utilizing perturbation theory this approach works for shape compensation of substrates which operate in various temperature environments. Verification is made using a finite element analysis which is further used to produce manufacturable CAD models. The remaining low spatial frequency errors are deterministically correctable using diamond turning or polishing techniques. (120.4880) Optomechanics, (120.6810) Thermal effects, (260.3910) Metal optics, (120.4610) Optical fabrication, (220.1920) Diamond machining

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