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

Orbital angular momentum beams generation from 61 channels coherent beam combining femtosecond digital laser

“…As shown on the insert of Fig. 5, the donut intensity distribution is rather well conserved after compression, illustrating the compatibility of CPA architecture with OAM beams generation and preservation [17]. Although out of the scope of this work, more detailed characterization of femtosecond pulses carrying orbital angular momentum shall ultimately be performed [18].…”

Optical parametric amplification of sub-cycle shortwave infrared pulses

“…The configuration of the CPA system of the Ti:sapphire laser was partly described in refs. 24 , 25 . In brief, a train of sub-10-fs pulses with a repetition rate of 78 MHz generated from a mode-locked oscillator of a Ti:sapphire laser (Rainbow, Femtolasers-Spectra-Physics) was sent to an Öffner-type stretcher to increase the duration of the pulse to ~300 ps with the spectral component from 670 to 750 nm restricted by the dimensions of the optics used in the stretcher.…”

Generation of Terawatt-Scale Vortex Pulses Based on Optical Parametric Chirped-Pulse Amplification

“…Some methods of laser-plasma interaction for indirectly generating vortex pulses are not suitable for generating stable and controllable powerful ultrafast vortex pulses in practice, such as stimulated Raman scattering [18], and a powerful ultrafast laser pulse impinging on a spiral foil [19]. Reference [20] has reported amplification of vortex beams to the millijoule level based on a Ti:sapphire chirped pulse amplification (CPA) system containing a five-pass amplifier. In comparison with CPA, the vortex can be further amplified in the optical parametric amplification (OPA) process because of a shorter optical path, and a smaller material dispersion and less thermal effect in OPA process.…”