Evaluation of an experimental high power, short-pulse radar

1997 ◽  
Author(s):  
C.F. Clutterbuck
Keyword(s):  
High Power ◽  
Short Pulse ◽  
Pulse Radar

scholarly journals Airborne River-Ice Thickness Profiling with Helicopter-Borne UHF Short-Pulse Radar

1987 ◽  
Vol 33 (115) ◽  
pp. 330-340 ◽  
Author(s):  
Steven A Arcone ◽  
Allan J Delaney
Keyword(s):  
Short Pulse ◽  
Hanging Wall ◽  
Open Water ◽  
High Water ◽  
High Water Content ◽  
Ice Thickness ◽  
Frazil Ice ◽  
Pulse Radar ◽  
Detailed Surface ◽  
Ice Conditions

AbstractThe ice-thickness profiling performance of a helicopter-mounted short-pulse radar operating at approximate center frequencies of 600 and 900 MHz was assessed. The antenna packages were mounted 1.2 m off the skid of a small helicopter whose speed and altitude were varied from about 1.8 to 9 m/s and 3 to 12 m. Clutter from the helicopter offered minimal interference with the ice data. Data were acquired in Alaska over lakes (as a proving exercise) and two rivers, whose conditions varied from open water to over 1.5 m of solid ice with numerous frazil-ice formations. The most readily interpretable data were acquired when the ice or snow surface was smooth. Detailed surface investigations on the Tanana River revealed good correlations of echo delay with solid ice depth, but an insensitivity to frazil-ice depth due to its high water content. On the Yukon River, coinciding temporally coherent surface and bottom reflections were associated with solid ice and smooth surfaces. All cases of incoherent surface returns (scatter) occurred over ice rubble. Rough-surface scattering was always followed by the appearance of bottom scattering but, in many cases, including a hanging-wall formation of solid frazil ice, bottom scattering occurred beneath coherent, smooth-surface reflections. Areas of incoherent bottom scattering investigated by drilling revealed highly variable ice conditions, including frazil ice. The minimum ice thickness that could be resolved from the raw data was about 0.2 m with the 600 MHz antenna and less than 0.15 m with the 900 MHz antenna.

scholarly journals A High-Power Tunable Short-Pulse XeCl Laser

1986 ◽  
Vol 14 (1) ◽  
pp. 41-47
Author(s):  
Akihiko TAHAHASHI ◽  
Osamu MATSUMOTO ◽  
Mitsuo MAEDA
Keyword(s):  
High Power ◽  
Short Pulse ◽  
Xecl Laser

scholarly journals Experimental estimates of the photon background in a potential light-by-light scattering study

2022 ◽  
Author(s):  
Leonard Doyle ◽  
Pooyan Khademi ◽  
Peter Hilz ◽  
Alexander Sävert ◽  
Georg Schaefer ◽  
...  
Keyword(s):  
High Power ◽  
Single Photon ◽  
Strong Field ◽  
Short Pulse ◽  
Experimental Investigations ◽  
Background Suppression ◽  
Focal Region ◽  
Quantum Vacuum ◽  
Photon Scattering ◽  
Residual Gas

Abstract High power short pulse lasers provide a promising route to study the strong field effects of the quantum vacuum, for example by direct photon-photon scattering in the all-optical regime. Theoretical predictions based on realistic laser parameters achievable today or in the near future predict scattering of a few photons with colliding Petawatt laser pulses, requiring single photon sensitive detection schemes and very good spatio-temporal filtering and background suppression. In this article, we present experimental investigations of this photon background by employing only a single high power laser pulse tightly focused in residual gas of a vacuum chamber. The focal region was imaged onto a single-photon sensitive, time gated camera. As no detectable quantum vacuum signature was expected in our case, the setup allowed for characterization and first mitigation of background contributions. For the setup employed, scattering off surfaces of imperfect optics dominated below the residual gas pressures of 1×10-4mbar. Extrapolation of the findings to intensities relevant for photon-photon scattering studies is discussed.

Broadband amplification at Kr 2 F trimer transition for short-pulse high-power laser applications

2010 ◽  
Author(s):  
Alexey O. Levchenko ◽  
Nikolai N. Ustinovskii ◽  
Vladimir D. Zvorykin
Keyword(s):  
High Power ◽  
Short Pulse ◽  
High Power Laser ◽  
Power Laser ◽  
Laser Applications

High-power short-pulse laser repetition rate improvement by adaptive wave front correction

2004 ◽  
Vol 75 (12) ◽  
pp. 5186-5192 ◽  
Author(s):  
B. Wattellier ◽  
J. Fuchs ◽  
J. P. Zou ◽  
K. Abdeli ◽  
C. Haefner ◽  
...  
Keyword(s):  
Wave Front ◽  
Pulse Laser ◽  
High Power ◽  
Repetition Rate ◽  
Short Pulse ◽  
Laser Repetition Rate ◽  
Short Pulse Laser ◽  
Rate Improvement
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