Fiber laser sources with narrow linewidths in the short-wave infrared and mid-infrared spectral regions have many defense, commercial, and sensing related applications. To generate wavelengths not produced by commercially available lasers, we introduce a compact design of a hollow core fiber-based optical parametric amplifier (OPA) with flexible phase-matching schemes. An electric field applied to fiber core liquids or gases can induce the required effective second-order nonlinearity. Quasi-phase-matching for efficient frequency conversion can be realized by applying spatially periodic electric fields along the length of the fiber. We investigate fiber-based OPA designs with xenon gas and liquids such as carbon disulfide to determine the viability of these architectures for efficient wavelength conversion and flexibility.
I. Pomerantz, E. McCary, A. Meadows, A. Arefiev, A. Bernstein, C. Chester, J. Cortez, M. Donovan, G. Dyer, E. Gaul, D. Hamilton, D. Kuk, A. Lestrade, C. Wang, T. Ditmire, B. Hegelich
At the Texas Petawatt laser facility we developed a novel ultra-short pulsed laser-driven neutron source generating an unprecedented output peak flux. Our results show a dramatic onset of high-energy electron generation from petawatt laser-irradiated plastic targets for targets thinner than a few microns. In this regime, the copious amounts of multi-MeV electrons emitted from the target are utilized to generate photo-neutrons from a metal converter. The neutrons are generated with a <50 ps pulse duration and a flux of 1018 n/cm2/s, exceeding any other pulsed or CW neutron source. In this paper, we will report on our measurement of the neutron yields produced from high atomic number converters.
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