Full control of polarization and temporal shape of ultrashort laser pulses transmitted through an optical fibre

Abstract

We present a method for generating ultrashort pulses of predetermined arbitrary shape at the distal end of a single mode step index fibre. The relevant properties of the fibre—dispersion, birefringence, and onset of non-linearities—are analyzed and included in the shaping procedure. The capabilities of the method are demonstrated with parametrically shaped sub-pulse sequences. In these sequences, each sub-pulse is independently controlled respective to its parameter energy, distance in time, phase, chirp, and state of polarization including orientation, ellipticity, and helicity. The availability of shaped femtosecond laser pulses via optical fibres will promote their application in endoscopy.

Shaped pulses transported through an optical fiber in the nonlinear regime for selective excitation of two-photon transitions

“…The effects included in this simulation are chromatic dispersion and self-phase modulation (which is the dominating nonlinear effect in the relevant regime). As mentioned in our previous work [12], assuming the dispersion of bulk silica for the simulation leads to systematic differences from the measurement which we attribute to the waveguide dispersion of the fiber. For the simulations presented in this paper we determined experimentally the coefficients β 2 and β 3 in the relevant spectral range (β 1 has no influence on the pulse shape).…”

“…It has been shown that for low pulse energies, where the nonlinear effects can be neglected, it is possible to obtain arbitrarily phase-, amplitude-, and polarization-shaped pulses after transmission through a fiber [12]. In this work we demonstrate an approach to obtaining a certain class of phaseshaped pulses after propagation through a step-index fiber in the nonlinear regime, namely pulses that can efficiently and selectively excite two-photon transitions.…”

Simulation of ultrashort pulse transmission in a chain of fused silica microspheres

“…Та-кие системы связи основаны на оптических волокнах, которые способны передавать оптические сигналы на большие расстоя-ния. Современные оптические волокна спо-собны передавать последовательности им-пульсов, длительностью порядка 2-8 пс на расстояния от 100 до 1000 км со скоростью от 10 до 12 Гб/с [1]. Однако объёмы переда-ваемой информации растут, и это требует разработки новых методик уплотнения ка-нала связи.…”

Selective excitation with shaped pulses transported through a fiber using reverse propagation

“…If nonlinear effects are negligible, a linear dispersion compensating element such as a grating compressor or a pulse shaper is sufficient. However, this is true only for ultrashort pulses with pulse energy of several picojoules [11]. Another possibility is to use photonic crystal fibers that have ei-* monika.pawlowska@fu-berlin.de ther a large mode area [12] or an air-filled core [13,14] and thus a smaller nonlinear parameter.…”