scholarly journals Liquid Crystals as High Repetition Rate Targets for Ultra Intense Laser Systems

2015 ◽  
Author(s):  
Patrick Poole ◽  
Christopher Willis ◽  
Ginevra Cochran ◽  
Matthew McMahon ◽  
Enam Chowdhury ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Intense Laser ◽  
High Repetition ◽  
Laser Systems

scholarly journals Improving Signal and Photobleaching Characteristics of Temporal Focusing Microscopy with the Increase in Pulse Repetition Rate

2019 ◽  
Vol 2 (3) ◽  
pp. 65
Author(s):  
Viktoras Lisicovas ◽  
Bala Murali Krishna Mariserla ◽  
Chakradhar Sahoo ◽  
Reuben T. Harding ◽  
Michael K. L. Man ◽  
...  
Keyword(s):  
Pulse Energy ◽  
Repetition Rate ◽  
Signal Intensity ◽  
High Repetition Rate ◽  
High Peak Power ◽  
High Pulse Energy ◽  
Two Photon ◽  
High Repetition ◽  
Laser Systems ◽  
High Pulse

Wide-field temporal focused (WF-TeFo) two-photon microscopy allows for the simultaneous imaging of a large planar area, with a potential order of magnitude enhancement in the speed of volumetric imaging. To date, low repetition rate laser sources with over half a millijoule per pulse have been required in order to provide the high peak power densities for effective two-photon excitation over the large area. However, this configuration suffers from reduced signal intensity due to the low repetition rate, saturation effects due to increased excitation fluences, as well as faster photobleaching of the fluorescence probe. In contrast, with the recent advent of high repetition rate, high pulse energy laser systems could potentially provide the advantages of high repetition rate systems that are seen in traditional two-photon microscopes, while minimizing the negatives of high fluences in WF-TeFo setups to date. Here, we use a 100 microjoule/high repetition rate (50–100 kHz) laser system to investigate the performance of a WF-TeFo two-photon microscope. While using micro-beads as a sample, we demonstrate a proportionate increase in signal intensity with repetition rate, at no added cost in photobleaching. By decreasing pulse intensity, via a corresponding increase in repetition rate to maintain fluorescence signal intensity, we find that the photobleaching rate is reduced by ~98.4%. We then image live C. elegans at a high repetition rate for 25 min. as a proof-of-principle. Lastly, we identify the steady state temperature increase as the limiting process in further increasing the repetition rate, and we estimate that repetition rate in the range between 0.5 and 5 MHz is ideal for live imaging with a simple theoretical model. With new generation low-cost fiber laser systems offering high pulse energy/high repetition rates in what is essentially a turn-key solution, we anticipate increased adoption of this microscopy technique by the neuroscience community.

scholarly journals Liquids for High Repetition Rate Glass Laser Systems

2009 ◽  
pp. 109-109-13
Author(s):  
JM Rinefierd ◽  
SD Jacobs ◽  
DC Brown ◽  
JA Abate ◽  
O Lewis ◽  
...  
Keyword(s):  
Repetition Rate ◽  
High Repetition Rate ◽  
Glass Laser ◽  
High Repetition ◽  
Laser Systems

High Repetition Rate for Ultra-High Peak Power Laser Systems

2016 ◽  
Author(s):  
Vladimir Chvykov ◽  
Huabao Cao ◽  
Roland S. Nagymihaly ◽  
Mikhail Kalashnikov ◽  
Nikita Khodakovskiy ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Peak Power ◽  
High Repetition Rate ◽  
High Peak ◽  
High Peak Power ◽  
Power Laser ◽  
High Repetition ◽  
Laser Systems

High repetition rate laser systems: targets, diagnostics and radiation protection

2010 ◽  
Author(s):  
Leonida A. Gizzi ◽  
Eugene Clark ◽  
David Neely ◽  
Luis Roso ◽  
Martin Tolley ◽  
...  
Keyword(s):  
Radiation Protection ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
High Repetition ◽  
Laser Systems

scholarly journals Background pressure effects on MeV protons accelerated via relativistically intense laser-plasma interactions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Joseph Snyder ◽  
John Morrison ◽  
Scott Feister ◽  
Kyle Frische ◽  
Kevin George ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Repetition Rate ◽  
High Vacuum ◽  
High Repetition Rate ◽  
Pressure Effects ◽  
Intense Laser ◽  
Proton Acceleration ◽  
Flowing Liquid ◽  
High Repetition ◽  
A Charge

Abstract We present how chamber background pressure affects energetic proton acceleration from an ultra-intense laser incident on a thin liquid target. A high-repetition-rate (100 Hz), 3.5 mJ laser with peak intensity of $$8 \times 10^{18}\,\text {Wcm}^{-2}$$ 8 × 10 18 Wcm - 2 impinged on a 450 nm sheet of flowing liquid ethylene glycol. For these parameters, we experimentally demonstrate a threshold in laser-to-proton conversion efficiency at background pressures $$< 8\,\text {Torr}$$ < 8 Torr , wherein the overall energy in ions $$>1\,\text {MeV}$$ > 1 MeV increases by an order of magnitude. Proton acceleration becomes increasingly efficient at lower background pressures and laser-to-proton conversion efficiency approaches a constant as the vacuum pressure decreases. We present two-dimensional particle-in-cell simulations and a charge neutralization model to support our experimental findings. Our experiment demonstrates that high vacuum is not required for energetic ion acceleration, which relaxes target debris requirements and facilitates applications of high-repetition rate laser-based proton accelerators.

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