Towards a fiber-coupled picowatt cryogenic radiometer
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 5...
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| Veröffentlicht in: | Optics letters 2012-06, Vol.37 (12), p.2346-2348 |
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| creator | Tomlin, N A Lehman, J H Nam, S |
| description | 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 ±0.3% (k=2). From our first optical tests, the system has a noise equivalent power of ≈5×10(-15) W/√Hz at 2 Hz, but simple changes to the measurement scheme should yield an NEP 2 orders of magnitude lower. |
| doi_str_mv | 10.1364/OL.37.002346 |
| format | Article |
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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 ±0.3% (k=2). 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| ispartof | Optics letters, 2012-06, Vol.37 (12), p.2346-2348 |
| issn | 0146-9592 1539-4794 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1136447754 |
| source | Optica Publishing Group Journals |
| subjects | Electric power generation Equivalence Micromachining Optical fibers Power measurements Radiometers Reproducibility Thermometers |
| title | Towards a fiber-coupled picowatt cryogenic radiometer |
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