Abstract
A picowatt cryogenic radiometer (PCR) has been fabricated at the microscale level for electrical substitution optical fiber power measurements. The absorber, electrical heater, and thermometer are all on a micromachined membrane less than 1 mm on a side. Initial measurements with input powers from 50 fW to 20 nW show a response inequivalence between electrical and optical power of 8%. A comparison of the response to electrical and optical input powers between 15 pW to 70 pW yields a repeatability better than (). From our first optical tests, the system has a noise equivalent power of at 2 Hz, but simple changes to the measurement scheme should yield an NEP 2 orders of magnitude lower.
Full Article | PDF ArticleMore Like This
N. A. Tomlin and J. H. Lehman
Opt. Lett. 38(2) 175-177 (2013)
R. U. Datla, K. Stock, A. C. Parr, C. C. Hoyt, P. J. Miller, and P. V. Foukal
Appl. Opt. 31(34) 7219-7225 (1992)
T. R. Gentile, J. M. Houston, J. E. Hardis, C. L. Cromer, and A. C. Parr
Appl. Opt. 35(7) 1056-1068 (1996)