Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Robert J. Phelan"'
Publikováno v:
Superconductor Science and Technology. 12:856-858
We have developed YBa2Cu3O7-x (YBCO) thermometers for large-area (4 mm × 4 mm) electrical substitution bolometers. We passivated the YBCO with a thin Au layer and demonstrated a noise equivalent temperature of 4 nK Hz-1/2. We then used a resistor la
Publikováno v:
SPIE Proceedings.
Using a well-characterized measurement system having 22 GHz bandwidth, we show that the relative intensity noise (RIN) of a commercial InGaAsP laser (multi-longitudinal mode) operating at 77 K is significantly reduced below room temperature values ov
Publikováno v:
Integrated Photonics Research.
Cryogenic operation of semiconductor lasers offers the potential for greater bandwidth due to improved frequency modulation response,1,2 lower threshold current, and higher power efficiency3 over that of room temperature operation. The 3- dB electric
Publikováno v:
SPIE Proceedings.
This paper describes the present efforts at NIST to improve the accuracy of the electrically calibrated pyroelectric detector for measuring optical power by an order of magnitude. The principal limitation, the uniformity of the responsivity over the
Publikováno v:
Optical Society of America Annual Meeting.
The efficient transfer of energy from dielectric regions to semiconductor-clad regions in semiconductor-clad dielectric waveguides is of paramount importance to the operation of waveguide polarizers and detectors. We have experimentally shown that th
Autor:
Donald R. Larson, Robert J. Phelan
Publikováno v:
Optics Letters. 15:544
We have fabricated hydrogenated amorphous germanium photodetectors coupled to channel waveguides in glass and lithium niobate substrates. We measured a pulse response duration of 140 psec (FWHM), which is shorter than that of any previously reported
Publikováno v:
Ferroelectrics. 10:99-102
Pyroelectiic detectors based on the polymer film polyvinylidene fluoride should be recognized as attractive choices for applications where a high detectivity coupled with a broad spectral response and a large area are required. Devices with a 1 cm2 a
Publikováno v:
Journal of Applied Physics. 45:3296-3303
Several configurations of pyroelectric optical‐radiation detectors are mathematically modeled to determine their frequency response and current response to step‐function heat inputs. Included in the analysis are heat losses by conduction and rera
Publikováno v:
Inorganic Chemistry. 10:2032-2038
Autor:
J. O. Dimmock, Robert J. Phelan
Publikováno v:
Applied Physics Letters. 10:55-58
Infrared photovoltaic response and high quantum efficiency have been observed in a large‐area InSb, metal‐oxide‐semiconductor structure. Spectral measurements indicate that the response is due to the generation of electron‐hole pairs in a dep