Phase matching with pulsed Bessel beams for high-order harmonic generation

Abstract

We propose a different approach to obtain phase-matched generation of high-order harmonics based on the use of pulsed Bessel beams as pump pulses. By means of the "coherence map" technique, we show that it is possible to maximize the generation of a chosen harmonic of interest by properly adjusting the phase front tilt of the pulsed Bessel beam to compensate the mismatch arising from material and plasma dispersion and atomic phase.

Carrier-envelope shearing and isolated attosecond pulse generation

“…By adopting the sign convention of [19], we may isolate each contribution to the phase matching for the harmonic field generation. The geometric term is always positive for both PBB and SLP, since the effective pump wavevector on axis is shortened in CWs [33][34][35]. The plasma contribution is positive as well and similar for both cases, as shown in Fig.…”

Spatial and temporal characterization of a Bessel beam produced using a conical mirror

“…Due to their diffraction-free characteristics, they have found applications in several fields of physics. Non-diffractive pump fields have been utilized in nonlinear optical processes like parametric down conversion [2,3,4,5,6,7], second [8,9,10,11], third [12], and higher-order harmonic generation [13]. Furthermore, the accuracy of optical tweezers [14,15,16], optical trapping [17,18,19,20,21] and the resolution of medical imaging [22,23] have been enhanced by the implementation of diffraction-free beams.…”

Finite-energy, accelerating Bessel pulses

“…Bessel beams are a particularly interesting class of light beams first investigated in detail by Durnin et al [5] and currently at the attention of a number of research areas ranging from extreme nonlinear optics [6] to particle trapping [7] (see also [8] and references therein). The ideal Bessel beam will be non-diffractive for all z.…”