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Gershenzon, E. M.; Gol'tsman, G. N.; Karasik, B. S.; Semenov, A. D. |
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Measurement of the energy gap in the compound YBaCu3O9-δ on the basis of the IR absorption spectrum |
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1987 |
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JETP Lett. |
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JETP Lett. |
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46 |
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5 |
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237-238 |
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YBCO HTS detectors |
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For the first time the long-wave infrared absorption spectrum has been measured by means of the bolometric effect and energy gap for high-temperature superconducting ceramics YBa/sub 2/Cu/sub 3/O/sub 9-delta/ has been determined from absorption threshold. 2delta/kT/sub c/ value is equal to 0.6. |
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1703 |
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Author |
Zhang, Zijing; Zhang, Jianlong; Wu, Long; Zhang, Yong; Zhao, Yuan; Su, Jianzhong |
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Title |
Photon-counting chirped amplitude modulation lidar using a smart premixing method |
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Journal Article |
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2013 |
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Opt. Lett. |
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Opt. Lett. |
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38 |
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21 |
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4389-4392 |
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photon-counting detector, lidar, Geiger mode APD, Geiger mode lidar |
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We proposed a new premixing method for photon-counting chirped amplitude modulation lidar (PCCAML). Earlier studies used the counting results of the returned signal detected by a Geiger mode avalanche photodiode detector (Gm-APD) to mix with the reference signal, called the postmixing method. We use an alternative method known as the premixing method, in which the reference signal is used to directly modulate the sampling gate width of the Gm-APD, and the mixing of the returned signal and the reference signal is completed before the Gm-APD. This premixing method is more flexible and may perform better than the postmixing method in terms of signal-to-noise ratio by cutting down a separated mixer commonly used in the postmixing lidar system. Furthermore, this premixing method lowers the demand for the sampling frequency of the Gm-APD. It allows the use of a much wider modulation bandwidth to improve the range accuracy and resolution. To the best of our knowledge, this is the first report to use the premixing method in the PCCAML system, which will benefit future lidar applications. |
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1006 |
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Gordon, N. T.; Lees, D. J.; Bowen, G.; Phillips, T. S.; Haigh, M.; Jones, C. L.; Maxey, C. D.; Hipwood, L.; Catchpole, R. A. |
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HgCdTe detectors operating above 200 K |
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2006 |
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J. Electron. Mater. |
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35 |
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6 |
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1140-1144 |
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HgCdTe detector |
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0361-5235 |
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467 |
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Lubzens, D.; Rosenfeld, D.; Nemirovsky, Y. |
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The noise equivalent temperature difference performance of HgCdTe photodiode array |
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1988 |
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Infrared Physics |
Abbreviated Journal |
Infrared Physics |
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28 |
Issue |
6 |
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417-423 |
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HgCdTe detector array |
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0020-0891 |
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469 |
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Gershenzon, E. M.; Gershenzon, M. E.; Goltsman, G. N.; Semenov, A. D.; Sergeev, A. V. |
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Wide-band highspeed Nb and YBaCuO detectors |
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1991 |
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IEEE Trans. Magn. |
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IEEE Trans. Magn. |
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27 |
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2 |
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2836-2839 |
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YBCO, HTS, Nb detectors |
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The physical limitations on the response time and the nature of nonequilibrium detection of radiation were investigated for Nb and YBCO film in a wide spectral range from millimeter to near-infrared wavelengths. In the case of ideal heat removal from the film, the detection mechanism is connected with an electron heating effect which is not selective over a wide spectral interval. For Nb, the dependence of the response time on the electron mean free path l and temperature T is tau varies as T/sup -2/l/sup -1/. The values of detectivity D* and tau are 3*10/sup 11/ W/sup -1/ Hz/sup 1/2/ cm and 5*10/sup -9/ s at T=1.6 K, respectively. For YBCO film the tau value of 1-2 ps at T=77 K was obtained; the NEP value of 3*10/sup -11/ W-Hz/sup -1/2/ can be obtained at T=77 K in the case of the optimal film matching to the radiation. |
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0018-9464 |
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239 |
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