Ultrashort optical-vortex pulse generation in few-cycle regime

Abstract

Abstract:We generated a 2.3-cycle, 5.9-fs, 56-μJ ultrashort opticalvortex pulse (ranging from ∼650 to ∼950 nm) in few-cycle regime, by optical parametric amplification. It was performed even by using passive elements (a pair of prisms and chirped mirrors) for chirp compensation. Spectrally-resolved interferograms and intensity profiles showed that the obtained pulses have no spatial or topological-charge dispersion during the amplification process. To the best of our knowledge, it is the first generation of optical-vortex pulses in few-cycle regime. They can be powerful tools for ultrabroadband and/or ultrafast spectroscopy and experiments of highintensity field physics.

Optical vortex driven charge current loop and optomagnetism in fullerenes

“…Such OAM beams have found an impressively wide range of applications [14,15,16,17,18,19,20,21,22]. Of particular relevance here are the recently generated fs OAM pulses [23] and OAM sources in the VUV and EUV regimes [24,25,26]. Due to phase singularity, the intensity of the OAM beam vanishes on the optical axis and rises to form a ring shape with a radius determined by the beam's waist (cf.…”

Generation of intense femtosecond optical vortex pulses with blazed-phase grating in chirped-pulse amplification system of Ti:sapphire laser

“…Many studies have been carried out on monochromatic OVs, which have been widely used in the optical manipulation of molecules and nanoparticles [8][9][10]. More recently, scientists have been attempting to generate multichromatic OVs with high energy and ultrashort temporal profiles [11][12][13][14][15][16][17]. Such an OV pulse exhibits a high peak power, which is the key to inducing nonlinear phenomena such as filamentation [18], supercontinuum [19], and high-harmonic generation [20,21].…”

“…prism [27,28], 2f-2f [14], and 4f configurations [13,15] or space-variant waveplates [11,12]. In particular, the combination of achromatic methods and laser amplifiers opens new possibilities for the generation of OVs with not only an ultrashort temporal profile but also a fairly high output energy [11,12].…”

“…In particular, the combination of achromatic methods and laser amplifiers opens new possibilities for the generation of OVs with not only an ultrashort temporal profile but also a fairly high output energy [11,12]. Yamane et al have recently generated an intense OV of 1.3 mJ and a duration of 27 fs by utilizing a chirped-pulse amplification (CPA) system of a Ti:sapphire laser with a 4f OV converter comprising a liquid-crystal spatial light modulator (LC-SLM) [29].…”

Single orbital angular mode emission from externally feed-backed vertical cavity surface emitting laser

“…6,7 Accordingly, various methods and types of lasers have been developed for generating vortex beams. [8][9][10][11][12][13][14][15] One attractive application of the vortex beam is spatial mode division multiplexing (MDM) in optical communication systems, which is a promising way of increasing the information capacity. 16 In MDM, the vortex beam is treated as a series of orbital angular momentum (OAM) modes [or Laguerre-Gaussian (LG) modes with arbitrary radial indices] derived from the paraxial wave equation.…”