High energy pulse modulator for microwave tube applications

2003 ◽  
Author(s):  
R. Richardson ◽  
D. Judd ◽  
B. Wenham
Keyword(s):  
High Energy ◽  
Pulse Modulator ◽  
Microwave Tube ◽  
Energy Pulse

scholarly journals Adaptive pulse compression for transform-limited 15-fs high-energy pulse generation

2000 ◽  
Vol 25 (8) ◽  
pp. 587 ◽  
Author(s):  
E. Zeek ◽  
R. Bartels ◽  
M. M. Murnane ◽  
H. C. Kapteyn ◽  
S. Backus ◽  
...  
Keyword(s):  
Pulse Compression ◽  
High Energy ◽  
Pulse Generation ◽  
Energy Pulse

scholarly journals Photoacoustic Energy Sensor for Nanosecond Optical Pulse Measurement

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3879 ◽  
Author(s):  
Pil Sang ◽  
Junseok Heo ◽  
Hui Park ◽  
Hyoung Baac
Keyword(s):  
High Energy ◽  
Hybrid Structure ◽  
Ultrasonic Pulse ◽  
Acoustic Frequency ◽  
Pulse Measurement ◽  
Optical Energy ◽  
Energy Meter ◽  
Energy Sensor ◽  
Energy Pulse ◽  
Spectral Ranges

We demonstrate a photoacoustic sensor capable of measuring high-energy nanosecond optical pulses in terms of temporal width and energy fluence per pulse. This was achieved by using a hybrid combination of a carbon nanotube-polydimethylsiloxane (CNT-PDMS)-based photoacoustic transmitter (i.e., light-to-sound converter) and a piezoelectric receiver (i.e., sound detector). In this photoacoustic energy sensor (PES), input pulsed optical energy is heavily absorbed by the CNT-PDMS composite film and then efficiently converted into an ultrasonic output. The output ultrasonic pulse is then measured and analyzed to retrieve the input optical characteristics. We quantitatively compared the PES performance with that of a commercial thermal energy meter. Due to the efficient energy transduction and sensing mechanism of the hybrid structure, the minimum-measurable pulsed optical energy was significantly lowered, ~157 nJ/cm2, corresponding to 1/760 of the reference pyroelectric detector. Moreover, despite the limited acoustic frequency bandwidth of the piezoelectric receiver, laser pulse widths over a range of 6–130 ns could be measured with a linear relationship to the ultrasound pulse width of 22–153 ns. As CNT has a wide electromagnetic absorption spectrum, the proposed pulsed sensor system can be extensively applied to high-energy pulse measurement over visible through terahertz spectral ranges.

Highly-efficient, high-energy pulse-burst Yb-doped fiber laser with transform limited linewidth

2014 ◽  
Author(s):  
Doruk Engin ◽  
Ibraheem Darab ◽  
John Burton ◽  
Jean-Luc Fouron ◽  
Frank Kimpel ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Energy ◽  
Pulse Burst ◽  
Highly Efficient ◽  
Energy Pulse

scholarly journals Micromachining of Invar with 784 Beams Using 1.3 ps Laser Source at 515 nm

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2962 ◽  
Author(s):  
Petr Hauschwitz ◽  
Bohumil Stoklasa ◽  
Jiří Kuchařík ◽  
Hana Turčičová ◽  
Michael Písařík ◽  
...  
Keyword(s):  
Coefficient Of Thermal Expansion ◽  
Light Emitting Diode ◽  
Laser System ◽  
Ultrashort Pulses ◽  
High Energy ◽  
Laser Source ◽  
Organic Light Emitting Diode ◽  
Energy Pulse ◽  
Cost Efficient ◽  
Monitoring Module

To fulfil the requirements for high-resolution organic light-emitting diode (OLED) displays, precise and high-quality micrometer-scale patterns have to be fabricated inside metal shadow masks. Invar has been selected for this application due to its unique properties, especially a low coefficient of thermal expansion. In this study, a novel cost-efficient method of multi-beam micromachining of invar will be introduced. The combination of a Meopta beam splitting, focusing and monitoring module with a galvanometer scanner and HiLASE high-energy pulse laser system emitting ultrashort pulses at 515 nm allows drilling and cutting of invar foil with 784 beams at once with high precision and almost no thermal effects and heat-affected zone, thus significantly improving the throughput and efficiency.

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