Novel approaches to THz sources and detectors at room temperature for imaging

2005 ◽  
Author(s):  
Yujie J. Ding ◽  
Wei Shi
Keyword(s):  
Room Temperature ◽  
Novel Approaches ◽  
Thz Sources

Trowelable Rubber Rocket Insulation for Use at 2800°C

1984 ◽  
Vol 57 (4) ◽  
pp. 843-854 ◽  
Author(s):  
J. G. Sommer
Keyword(s):  
Room Temperature ◽  
Loss Rate ◽  
Service Temperature ◽  
Material Loss ◽  
Blowing Agent ◽  
Unusual Combination ◽  
Novel Approaches ◽  
Glass Microballoons ◽  
Burning Propellant ◽  
Intense Heat

Abstract Ablative, trowelable rocket insulation was prepared; it crosslinks at room temperature and self-bonds to prevulcanized NBR insulation. The material loss rate (MLR) of this insulation is low when it is tested by an oxyacetylene torch at temperatures of about 2800°C. Boric acid in the insulation causes an effective char to form at service temperature. This char slows the loss rate of nondegraded insulation beneath it. Density of this nondegraded insulation is 1.3 g/cm3. Density is reduced sharply to 0.8 g/cm3 by incorporating glass microballoons. They cause only a slight increase in MLR of the insulation at service temperatures. MLR can be significantly reduced by incorporating a blowing agent which decomposes only after the insulation is exposed to service temperature. Hence, an unusual combination of requirements is met by several novel approaches. This insulation has protected rockets as large as 6.6 meters in diameter from the intense heat of burning propellant in service.

PROGRESS ON WIDELY-TUNABLE MONOCHROMATIC THz SOURCES AND ROOM-TEMPERATURE DETECTIONS OF THz WAVES

2006 ◽  
Vol 15 (01) ◽  
pp. 89-111 ◽  
Author(s):  
YUJIE J. DING ◽  
WEI SHI
Keyword(s):  
Peak Power ◽  
Room Temperature ◽  
Difference Frequency Generation ◽  
Infrared Laser ◽  
Output Wavelength ◽  
Infrared Laser Beam ◽  
Order Of Magnitude ◽  
Thz Sources ◽  
Thz Waves ◽  
Thz Power

We have further developed widely-tunable monochromatic THz sources. These sources are based on difference-frequency generation (DFG) in GaSe and GaP crystals. Using a 47 mm long GaSe crystal the output wavelength was tuned in the range from 66.5 to 5664 μm (from 150 to 1.77 cm-1) with the peak powers reaching 389 W. This record-high power corresponds to a conversion efficiency of ~0.1%. On the other hand, using a 20 mm long GaP crystal the output wavelength was tuned in the range 71.1–2830 μm whereas the highest peak power was 15.6 W. The advantage of using GaP over GaSe is obvious: crystal rotation is no longer required for wavelength tuning. Instead, one just needs to tune the wavelength of one mixing beam within the bandwidth of as narrow as 15.3 nm. Most recently, we implemented a new scheme for detecting THz waves based on upconversion at room temperature, i.e. by mixing the THz wave with an infrared laser beam, we observed the upconverted signal at a wavelength just slightly longer than that of the infrared laser. To date the detectable THz power is just an order of magnitude higher than that for a bolometer. This scheme allows us to measure the pulse energy density, wavelength, linewidth, and pulse width of a THz beam at room temperature. Using our widely-tunable monochromatic THz beam, we directly measured the absorption spectra of three different families of the homologues of the chemical vapors.

scholarly journals Tunable Room Temperature THz Sources Based on Nonlinear Mixing in a Hybrid Optical and THz Micro-Ring Resonator

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Raju Sinha ◽  
Mustafa Karabiyik ◽  
Chowdhury Al-Amin ◽  
Phani K. Vabbina ◽  
Durdu Ö. Güney ◽  
...  
Keyword(s):  
Room Temperature ◽  
Ring Resonator ◽  
Nonlinear Mixing ◽  
Thz Sources

Room temperature compact THz sources based on quantum cascade laser technology

2013 ◽  
Author(s):  
Manijeh Razeghi ◽  
Q. Y. Lu ◽  
N. Bandyopadhyay ◽  
S. Slivken ◽  
Y. Bai
Keyword(s):  
Quantum Cascade Laser ◽  
Room Temperature ◽  
Laser Technology ◽  
Quantum Cascade ◽  
Thz Sources

Novel approaches for highly selective, room-temperature gas sensors based on atomically dispersed non-precious metals

2020 ◽  
Vol 8 (45) ◽  
pp. 23784-23794
Author(s):  
Renbing Tian ◽  
Shiyan Wang ◽  
Xuefeng Hu ◽  
Jian-Guo Zheng ◽  
Peng Ji ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Precious Metals ◽  
Catalytic Reactions ◽  
Atom Economy ◽  
Novel Approaches

Atomically dispersed (AD) materials have incredible catalytic ability and offer atom economy with 100% metal utilization during catalytic reactions.

scholarly journals Novel Approaches for Genuine Single-Phase Room Temperature Magnetoelectric Multiferroics

2016 ◽  
pp. 789-829 ◽  
Author(s):  
Lynette Keeney ◽  
Michael Schmidt ◽  
Andreas Amann ◽  
Tuhin Maity ◽  
Nitin Deepak ◽  
...  
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Novel Approaches
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