Spectrally resolved, broadband frequency response characterization of photodetectors using continuous-wave supercontinuum sources

2018 ◽  
Author(s):  
Vishal Choudhury ◽  
K.P. Nagarjun ◽  
Roopa Prakash ◽  
V.R. Supradeepa
Keyword(s):  
Frequency Response ◽  
Continuous Wave ◽  
Spectrally Resolved ◽  
Broadband Frequency

Characterization of optoacoustic transducers through the analysis of angular-dependent frequency response

2009 ◽  
Author(s):  
André Conjusteau ◽  
Sergey A. Ermilov ◽  
Richard Su ◽  
Hans-Peter Brecht ◽  
Matthew P. Fronheiser ◽  
...  
Keyword(s):  
Frequency Response ◽  
Dependent Frequency

scholarly journals Structural characterization of laser-treated Cr3C2–NiCr coatings

2001 ◽  
Vol 16 (12) ◽  
pp. 3416-3422 ◽  
Author(s):  
P. Serra ◽  
J. M. Miguel ◽  
J. L. Morenza ◽  
J. M. Guilemany
Keyword(s):  
Wear Resistance ◽  
Continuous Wave ◽  
Wave Mode ◽  
Superficial Layer ◽  
Corrosion And Wear ◽  
Crack Network ◽  
Interconnected Porosity ◽  
Laser Treatments ◽  
Continuous Wave Mode

The interconnected porosity of the Cr3C2–NiCr coatings obtained by high-velocity oxy fuel spraying is detrimental in corrosion and wear resistance applications. Laser treatments allow sealing of their surfaces through melting and resolidification of a thin superficial layer. A Nd:YAG laser beam was used to irradiate Cr3C2–NiCr coatings either in the continuous wave mode or at different repetition rates in the pulsed one. Results indicated that high peak and low mean laser irradiances are not good, since samples presented deep grooves and an extensive crack network. At low peak and higher mean laser irradiances the surface was molten, and only a few shallow cracks were observed. The interconnected porosity was completely eliminated in a layer up to 80 μm thick, formed by large Cr7C3 grains imbedded in a NiCr matrix.

scholarly journals High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1991
Author(s):  
Jun Dai ◽  
Yikun Ding ◽  
Cunjun Ruan ◽  
Xiangyan Xu ◽  
Hulin Liu
Keyword(s):  
Electric Fields ◽  
Current Density ◽  
Electron Emission ◽  
Continuous Wave ◽  
High Current Density ◽  
Optical Power ◽  
Photocurrent Density ◽  
Maximum Current ◽  
Section Electron

High photocurrent density cathodes that enable small cross-section electron beams are required for high-power terahertz vacuum devices. Multi-alkali antimonide photocathodes may be well suited for generating sub-mm electron beam sources. This paper involves the repeatability, stability, uniformity, and linearity experiments of the multi-alkali antimonide photocathodes electron emission operations under a continuous-wave 450 nm laser with a bias voltage of 5000 V. The effect of heat, electric contact, and cathode surface roughness to emission characterizations is analyzed. The methods to maintain the high-current-density emission and avoid the fatigue of the photocathode are verified. The emission can be repeated with increased optical power. The stable photocurrent density of near 1 A/cm2 and maximum current density of near 1.43 A/cm2 is recorded. The continuous photocurrent density is significantly improved compared to the current density reported in traditional applications. It is found that the current curves measuring at different areas of the photocathode differ greatly after the laser power of 800 mW. The increase in current for some areas may be attributed to the conductive current caused by built-in electric fields between the emission rough area and its adjacent areas.

Characterization of ErAs:GaAs and LuAs:GaAs Superlattice Structures for Continuous-Wave Terahertz Wave Generation through Plasmonic Photomixing

2016 ◽  
Vol 37 (7) ◽  
pp. 640-648 ◽  
Author(s):  
Shang-Hua Yang ◽  
Rodolfo Salas ◽  
Erica M. Krivoy ◽  
Hari P. Nair ◽  
Seth R. Bank ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Terahertz Wave ◽  
Wave Generation ◽  
Superlattice Structures
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