28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Modeling Thermal Parasitic Load Lines for an Optical Refrigerator

29 Jun 2015, 14:00
2h
Exhibit Hall (Arizona Ballroom) ()

Exhibit Hall (Arizona Ballroom)

Poster Presentation CEC-17 - Novel Concepts and New Devices C1PoJ - Novel Concepts and New Devices I

Speakers

Mr Christopher Dodson (Air Force research labs)Mr Thomas Fraser (air force research labs)

Description

Optical refrigeration is currently the only completely solid state cooling method capable of reaching cryogenic temperatures from room temperature. Optical cooling utilizing Yb:YLF as the refrigerant crystal has resulted in temperatures lower than 123K measured via a fluorescence thermometry technique. However, to be useful as a refrigerator this cooling crystal must be attached to a sensor or other payload. The phenomenology behind laser cooling, known as anti-Stokes fluorescence, has a relatively low efficiency which makes the system level optimization and limitation of parasitic losses imperative. We propose and model a variety of potential designs for a final optical refrigerator, enclosure and thermal link; calculate conductive and radiative losses, and estimate direct fluorescence reabsorption. We generate parasitic load-lines; these curves define temperature-dependent minimum heat lift thresholds that must be achieved to generate useful cooling.

Primary author

Kyle Martin (ATA/AFRL)

Co-authors

Mr Christopher Dodson (Air Force research labs) Mr Jason Schomacker (Rensselaer Polytechnic Institute) Mr Thomas Fraser (air force research labs)

Presentation Materials