High efficiency coupling and guiding of intense femtosecond laser pulses in preformed plasma channels in an elongated gas jet
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742 (United States)
We report coupling and guiding of pulses of peak power up to 0.3 TW in 1.5 cm long preformed plasma waveguides generated in a high repetition rate argon gas jet. Coupling of up to 52{percent} was measured for 50 mJ, {minus}110 fs pulses injected at times longer than 20 ns, giving guided intensities up to {minus}5{times}10{sup 16}&hthinsp;W/cm{sup 2}. It was found that for short delays between waveguide generation and pulse injection, pulse shortening occurred, with this effect reduced as delay was increased. Injection into the waveguide of two consecutive pulses separated by a few nanoseconds resulted in the reduction of shortening of the second pulse at all delays. Femtosecond time-resolved shadowgrams of the coupling of injected pulses into the waveguide show that there is {approximately}0.5 mm of neutral gas remaining at the waveguide entrance after waveguide generation. {copyright} {ital 1999 American Institute of Physics.}
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-97ER41039
- OSTI ID:
- 692539
- Report Number(s):
- CONF-980742-; ISSN 0094-243X; TRN: 9922M0033
- Journal Information:
- AIP Conference Proceedings, Vol. 472, Issue 1; Conference: 8. workshop on advanced accelerator concepts, Baltimore, MD (United States), 6-11 Jul 1998; Other Information: PBD: Jul 1999
- Country of Publication:
- United States
- Language:
- English
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