Dammann SHG-FROG for characterization of the ultrashort optical pulses

Abstract

In this paper we propose a very simple layout of multi-shot second-harmonic-generation (SHG) frequency-resolved optical gating (FROG) using three reflective Dammann gratings (Dammann SHG-FROG ) for characterization of the ultrashort optical pulses. One reflective Dammann gratings is used as the beamsplitter and the other two compensate the angular dispersion. Both theoretical and experimental results show that the distortions of the optical pulses introduced by the reflective Dammann gratings are very small. This device should be highly interesting for characterizing the ultrashort pulse.

Femtosecond off-axis digital holography for monitoring dynamic surface deformation

“…The TMZI and RMI are used in the same setup. The laser system used in this experiment is a commercial 76 MHZ Ti:sapphire laser oscillator (Coherent, Incorporated), the center wavelength is λ ¼ 800 nm, and the duration of the pulses (FWHM) is τ ¼ 100 fs (measured by a homemade Dammann FROG setup [24]). Femtosecond laser pulses from the laser oscillator were split into two parts: the first intense p-polarized pump-pulse (τ ¼ 100 fs, λ ¼ 800 nm) incident at about θ ¼ 30°was focused on the surface of the Cr film (thickness of 145 nm) to induce transient changes with a lens (f ¼ 30 mm), while the second weak pulse (second harmonic, τ ¼ 100 fs, λ ¼ 400 nm) was used in the other arm of the interferometer for probing.…”

Femtosecond laser-induced thermal lens effect in chromium film

“…1. The laser system used in this experiment is a commercial 76 MHz Ti:sapphire laser oscillator (Coherent, Inc.); the center wavelength is λ ¼ 800 nm and the duration of the pulses (FWHM) is τ ¼ 100 fs (measured by a homemade Dammann frequency-resolved optical gating setup [25]). Femtosecond laser pulses from the laser oscillator are split into two parts: the first intense femtosecond laser (τ ¼ 100 fs, λ ¼ 800 nm) is used for pumping, while the second weak laser beam (second harmonic, τ ¼ 100 fs, λ ¼ 400 nm) is used for probing.…”

Femtosecond first-order autocorrelation measurement based one-photon induced photocurrent in Si Schottky diodes

“…Up to date, frequency-resolved optical gating (FROG) and spectral-phase interferometry for direct electric-field reconstruction (SPIDER) have been successfully employed for intensity and phase measurements of ultrashort laser pulses [11][12][13][14]. However, the autocorrelation technique has many experimental advantages, such as easy implementation, self-calibration from interferometric fringes, and requires laser pulses of much lower intensities than either FROG or SPIDER.…”