First demonstration of an all-solid-state optical cryocooler
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Physics & Astronomy
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Physics & Astronomy
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Solid-state optical refrigeration uses anti-Stokes fluorescence to cool macroscopic objects to cryogenic temperatures without vibrations. Crystals such as Yb3+-doped YLiF4 (YLF:Yb) have previously been laser-cooled to 91 K. In this study, we show for the first time laser cooling of a payload connected to a cooling crystal. A YLF:Yb crystal was placed inside a Herriott cell and pumped with a 1020-nm laser (47 W) to cool a HgCdTe sensor that is part of a working Fourier Transform Infrared (FTIR) spectrometer to 135 K. This first demonstration of an all-solid-state optical cryocooler was enabled by careful control of the various desired and undesired heat flows. Fluorescence heating of the payload was minimized by using a single-kink YLF thermal link between the YLF:Yb cooling crystal and the copper coldfinger that held the HgCdTe sensor. The adhesive-free bond between YLF and YLF:Yb showed excellent thermal reliability. This laser-cooled assembly was then supported by silica aerogel cylinders inside a vacuum clamshell to minimize undesired conductive and radiative heat loads from the warm surroundings. Our structure can serve as a baseline for future optical cryocooler devices.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; US Air Force Office of Scientific Research (AFOSR)
- Grant/Contract Number:
- AC52-06NA25396; FA9550-15-1-024; FA9550-16-1-0362
- OSTI ID:
- 1457311
- Report Number(s):
- LA-UR-18-20886
- Journal Information:
- Light, Science & Applications, Vol. 7; ISSN 2047-7538
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Laser cooling of Yb 3+ :KYW
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journal | January 2020 |
Optical refrigeration: the role of parasitic absorption at cryogenic temperatures
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journal | January 2019 |
Observation of optical refrigeration in a holmium-doped crystal
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journal | January 2019 |
Tm-doped crystals for mid-IR optical cryocoolers and radiation balanced lasers
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journal | January 2019 |
Observation of Optical Refrigeration in a Holmium-doped Crystal | text | January 2018 |
Tm-doped Crystals for mid-IR Optical Cryocoolers and Radiation Balanced Lasers | text | January 2019 |
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