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Anosov, A. A.; Barabanenkov, Yu. N.; Kazanskii, A. S.; Less, Yu. A.; Sharakshane, A. S. |
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The inverse problem of acoustothermography with correlation reception of thermal acoustic radiation |
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2009 |
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Acoust. Phys. |
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55 |
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1 |
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114-119 |
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acoustic thermography, acoustothermography |
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For the one-dimensional inverse problem of acoustothermography with correlation reception of thermal acoustic radiation, an integral equation is presented and experimentally verified. A method of solving the inverse problem is proposed. The method is based on combining the correlation functions of thermal acoustic radiation that were obtained for different distances between the receivers. |
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1131 |
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Ozhegov, R. V.; Okunev, O. V.; Gol’tsman, G. N.; Filippenko, L. V.; Koshelets, V. P. |
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Title |
Noise equivalent temperature difference of a superconducting integrated terahertz receiver |
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Journal Article |
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2009 |
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J. Commun. Technol. Electron. |
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J. Commun. Technol. Electron. |
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54 |
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6 |
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716-720 |
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SIS mixer SIR NETD, FFO, harmonic mixer |
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The dependence of the noise equivalent temperature difference (NETD) of a superconducting integrated receiver (SIR) on the receiver noise temperature and the inputsignal level has been investigated. An unprecedented NETD of 13±2 mK has been measured at a SIR noise temperature of 200 K, intermediate-frequency bandwidth of 4 GHz, and time constant of 1 s. With a decrease in the input signal, an improvement in the NETD is observed. This effect is explained by a reduction in the influence of the instabilities of the receiver power supply and the amplification circuit that occur when the input signal is decreased. |
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1064-2269 |
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1400 |
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Mohan, Nishant; Minaeva, Olga; Goltsman, Gregory N.; Saleh, Mohammed F.; Nasr, Magued B.; Sergienko, Alexander V.; Saleh, Bahaa E.; Teich, Malvin C. |
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Ultrabroadband coherence-domain imaging using parametric downconversion and superconducting single-photon detectors at 1064 nm |
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2009 |
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Appl. Opt. |
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Appl. Opt. |
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48 |
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20 |
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4009–4017 |
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SSPD, SNSPD, SPAD |
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Coherence-domain imaging systems can be operated in a single-photon-counting mode, offering low detector noise; this in turn leads to increased sensitivity for weak light sources and weakly reflecting samples. We have demonstrated that excellent axial resolution can be obtained in a photon-counting coherence-domain imaging (CDI) system that uses light generated via spontaneous parametric downconversion (SPDC) in a chirped periodically poled stoichiometric lithium tantalate (chirped-PPSLT) structure, in conjunction with a niobium nitride superconducting single-photon detector (SSPD). The bandwidth of the light generated via SPDC, as well as the bandwidth over which the SSPD is sensitive, can extend over a wavelength region that stretches from 700 to 1500 nm. This ultrabroad wavelength band offers a near-ideal combination of deep penetration and ultrahigh axial resolution for the imaging of biological tissue. The generation of SPDC light of adjustable bandwidth in the vicinity of 1064 nm, via the use of chirped-PPSLT structures, had not been previously achieved. To demonstrate the usefulness of this technique, we construct images for a hierarchy of samples of increasing complexity: a mirror, a nitrocellulose membrane, and a biological sample comprising onion-skin cells. |
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RPLAB @ gujma @ |
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