Self-referenced spectral interferometry

Adaptive-feedback spectral-phase control for interactions with transform-limited ultrashort high-power laser pulses

“…Several technologies have recently been demonstrated to precisely control the spectral phase for ultrafast laser pulses [7][8][9][10]. In particular, an adaptive spectral phase closed-loop feedback system has the capability to measure the spectral phase using a self-referenced spectral interferometer (SRSI) [11], and it is able to precisely control the spectral phase by means of an acoustic optic programmable dispersive filter (AOPDF) [7].…”

“…The spectral phase was measured using SRSI (Wizzler, Fastlite Inc.) for each laser shot. The spectral phase information was extracted from the spectral interference between the initial pulse and its crossed-polarized wave (XPW) pulse [11]. An adaptive spectral phase closed-loop between the SRSI and AOPDF, using the measurement from the SRSI to set the phase imparted by the AOPDF on the pulse, was implemented in order to compensate for the residual dispersion from the entire laser system.…”

Self-referenced spectral interferometry for ultrashort infrared pulse characterization

“…1, Self-Referenced Spectral Interferometry [4,5] consists of analyzing the fringes of the interferogram created by mixing an unknown optical pulse (pink arrows) and a reference pulse (blue arrows) delayed in time by . In our case, the reference pulse is generated from fraction of the pulse to be measured passing through a temporal filter based on Cross-Polarized Wave Generation (XPW) [6], a degenerate third-order nonlinear process.…”

“…A broadband, single shot characterization technique is mandatory, since these sources are based on nonlinear parametric frequency conversion, and so intensity fluctuations in the pump lead to shot to shot phase fluctuations in the signal. Up to our knowledge, none of the usually used characterization techniques (like FROG or SPIDER) have been adapted yet to few-cycle pulse characterization in the SWIR [3].Self-Referenced Spectral Interferometry (SRSI) [4,5], discussed here, is a technique which offers intrinsically single-shot and frequency-conserving pulse reconstruction (i.e. the recorded signal is at the same wavelength as the input signal).…”

“…Self-Referenced Spectral Interferometry (SRSI) [4,5], discussed here, is a technique which offers intrinsically single-shot and frequency-conserving pulse reconstruction (i.e. the recorded signal is at the same wavelength as the input signal).…”