Pulse-front tilt for short-wavelength lasing by means of traveling-wave plasma-excitation

Bleiner, Davide; Feurer, Thomas (2012). Pulse-front tilt for short-wavelength lasing by means of traveling-wave plasma-excitation. Applied optics, 51(36), pp. 8848-8853. Washington, D.C.: Optical Society of America 10.1364/AO.51.008848

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Generation of coherent short-wavelength radiation across a plasma column is dramatically improved under traveling-wave excitation (TWE). The latter is optimized when its propagation is close to the speed of light, which implies small-angle target-irradiation. Yet, short-wavelength lasing needs large irradiation angles in order to increase the optical penetration of the pump into the plasma core. Pulse-front back-tilt is considered to overcome such trade-off. In fact, the TWE speed depends on the pulse-front slope (envelope of amplitude), whereas the optical penetration depth depends on the wave-front slope (envelope of phase). Pulse-front tilt by means of compressor misalignment was found effective only if coupled with a high-magnification front-end imaging/focusing component. It is concluded that speed matching should be accomplished with minimal compressor misalignment and maximal imaging magnification.

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