Picosecond High-Voltage Pulses Generation Using Low-Temperature (LT) GaAs

1991 ◽  
Vol 241 ◽  
Author(s):  
T. Motet ◽  
J. Nees ◽  
S. Williamson ◽  
G. Mourou
Keyword(s):  
Low Temperature ◽  
Pulse Shape ◽  
Laser Pulses ◽  
Full Width ◽  
Half Maximum ◽  
Photoconductive Switch ◽  
Electrical Pulses ◽  
Fs Laser ◽  
Temporal Pulse ◽  
Low Temperature Grown Gaas

ABSTRACTWe report on the generation of 825 V electrical pulses with 1.4 ps rise time and 4 ps Full-Width-at-Half-Maximum using pulse biased Low-Temperature-grown GaAs photoconductive switch triggered by submicrojoule, 150 fs laser pulses. Dependence of the temporal pulse shape on both the electric field and the optical energy is observed and discussed.

Ultrafast photoconductors from low-temperature-grown GaAs for terahertz components activated by femtosecond 1-μm wavelength laser pulses

2012 ◽  
Vol 9 (7) ◽  
pp. 1693-1695
Author(s):  
Juozas Adamonis ◽  
Klemensas Bertulis ◽  
Andrius Bičiūnas ◽  
Ramūnas Adomavičius ◽  
Arūnas Krotkus
Keyword(s):  
Low Temperature ◽  
Laser Pulses ◽  
Low Temperature Grown Gaas

Characterization of Femtosecond Low-Temperature-Grown GaAs Photoconductive Switch

2002 ◽  
Vol 19 (4) ◽  
pp. 557-559 ◽  
Author(s):  
Lin Wei-Zhu ◽  
Liu Zhi-Gang ◽  
Liao Rui ◽  
Zhang Hai-Chao ◽  
Guo Bing ◽  
...  
Keyword(s):  
Low Temperature ◽  
Photoconductive Switch ◽  
Low Temperature Grown Gaas

scholarly journals Photoconductive switch pulse shaping device for the Nova master oscillator

1986 ◽  
Vol 4 (1) ◽  
pp. 141-143 ◽  
Author(s):  
R. B. Wilcox
Keyword(s):  
Pulse Shape ◽  
Pulse Shaping ◽  
Master Oscillator ◽  
Gain Saturation ◽  
Optical Pulses ◽  
Photoconductive Switch ◽  
Electrical Pulses

We have compensated for gain saturation in the Nova amplifiers by producing shaped input optical pulses. A silicon switch device generates kilovolt electrical pulses for driving pockels cells. The pulse shape is easily controllable with subnanosecond resolution.

Experimental Investigation of Terahertz Temporal Response of a Photoconductive Switch

2012 ◽  
Vol 571 ◽  
pp. 491-495 ◽  
Author(s):  
Peng Wei Gong ◽  
Zhe Ma ◽  
Hong Mei Ma ◽  
Chun Tao Yang
Keyword(s):  
Femtosecond Laser ◽  
Pulse Width ◽  
Coplanar Waveguide ◽  
Coaxial Cable ◽  
Temporal Response ◽  
Photoconductive Switch ◽  
Terahertz Pulses ◽  
Electrical Pulses ◽  
Microwave Probe ◽  
Low Temperature Grown Gaas

Picosecond or subpicosecond electrical pulses can be generated from femtosecond laser excited photoconductive switches, and this technique is an effective method to characterize the rise time of the broadband oscilloscopes recently. In this paper, low temperature grown GaAs (LT-GaAs) is used as the substrate of the photoconductive switch which is excited by the femtosecond laser. After propagating along a coplanar waveguide, the generated terahertz pulses are transferred to a 1.85 mm coaxial cable through a microwave probe. The pulse width is measured in a 70 GHz sampling oscilloscope, the FWHM value is about 7.4 ps.

Pulse Shape Influence on the Accuracy of Z-scan Measurements

2005 ◽  
Vol 10 (2) ◽  
pp. 119-136 ◽  
Author(s):  
A. Dement’ev ◽  
A. Jovaiša
Keyword(s):  
Pulse Shape ◽  
Laser Pulses ◽  
Beam Waist ◽  
Short Pulses ◽  
Peak Intensity ◽  
Measurement Results ◽  
Pulse Peak ◽  
The Common ◽  
Shape Influence ◽  
Temporal Pulse

Although the laser pulses with durations ranging from nanoseconds to femtoseconds and various pulse shapes are utilized for the Z-scan measurements, the influence of the temporal pulse shape on the measurement results is often neglected. In this paper, we tried to differentiate the influence of the temporal pulse shape on the common Z-scan technique with a small on-axis aperture in two cases: when the pulse peak intensity at the beam waist is known (for relatively long pulses), or when the total pulse energy and full width at half maximum (FWHM) of the correlation functions or FWHM of pulse durations are known (for short pulses).

scholarly journals The Characteristics of Action Potentials in Primo Vessels and the Effects of Acetylcholine Injection to the Action Potentials

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Seong Jin Cho ◽  
Jaekwan Lim ◽  
Sun Hee Yeon ◽  
O. Sang Kwon ◽  
Kwang-Ho Choi ◽  
...  
Keyword(s):  
Action Potentials ◽  
Pulse Shape ◽  
Acupuncture Treatment ◽  
Smooth Muscles ◽  
Full Width ◽  
Half Maximum

In a previous study, we found that Primo vessels generate different action potentials in smooth muscles, but this study compared the pulse shape to distinguish the two tissues. Thus, a more sophisticated extracellular experiment was performed in this study using an acetylcholine injection; we then observed changes in the amplitude, FWHM (full width at half maximum), and period to explore Primo vessel function. A third type of pulse was recorded for Primo vessels. We observed fast depolarizing and repolarizing phases for this pulse. Further, its FWHM was 30 ms between smooth muscles and neurons. Acetylcholine affected only the period. The amplitude and FWHM were consistent after injection. Primo-vessels generated action potentials at twice the frequency after injection. From the results, we speculate that Primo-vessels perform a role in transferring signals in a different manner, which may be relevant for acupuncture treatment.

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