Loiko Yurii, Botey Muriel, Herrero Ramon, Staliunas Kestutis
Departament de Física, Universitat Autònoma de Barcelona, Bellaterra, Spain.
Opt Express. 2012 May 7;20(10):11271-6. doi: 10.1364/OE.20.011271.
We propose a versatile and efficient technique for the formation of X-pulses in materials with a periodical gain/loss modulation on the wavelength scale. We show that in such materials the strong wave-vector anisotropy of amplification/attenuation of the Bloch modes enables the shaping of ultra-short light pulses around the edges of the first Brillouin zone. X-pulses generation is numerically demonstrated and the optimum conditions are derived; specific characteristics of X-pulses can be tailored by appropriate selection of the geometry and modulation depth.
