Abstract:We introduce a simple delay-scanned complete spatiotemporal intensity-and-phase measurement technique based on wavelength-multiplexed holography to characterize long, complex pulses in space and time. We demonstrate it using pulses emerging from multi-mode fiber. This technique extends the temporal range and spectral resolution of the single-frame STRIPED FISH technique without using an otherwise-required expensive ultranarrow-bandpass filter. With this technique, we measured the complete intensity and phase o… Show more
“…In order to ensure full coherent combination, the full spatiotemporal information of the beams must be measured, including intensity and phase in time and space domains. Advanced diagnostics are therefore required to reconstruct the E-field, such as STRIPED FISH [353] (Spatially and Temporally Resolved Intensity and Phase Evaluation Device: Full Information from a Single Hologram) shown in Figure 40 or TERMITES [354] (Total E-Field Reconstruction using a Michelson Interferometer Temporal Scan).…”
Section: Future Technologiesmentioning
confidence: 99%
“…Figure 40.The schematic of a STRIPED FISH apparatus for single-shot complete spatiotemporal pulse measurement (reproduced from Ref. [353]).…”
In the 2015 review paper ‘Petawatt Class Lasers Worldwide’ a comprehensive overview of the current status of high-power facilities of
${>}200~\text{TW}$
was presented. This was largely based on facility specifications, with some description of their uses, for instance in fundamental ultra-high-intensity interactions, secondary source generation, and inertial confinement fusion (ICF). With the 2018 Nobel Prize in Physics being awarded to Professors Donna Strickland and Gerard Mourou for the development of the technique of chirped pulse amplification (CPA), which made these lasers possible, we celebrate by providing a comprehensive update of the current status of ultra-high-power lasers and demonstrate how the technology has developed. We are now in the era of multi-petawatt facilities coming online, with 100 PW lasers being proposed and even under construction. In addition to this there is a pull towards development of industrial and multi-disciplinary applications, which demands much higher repetition rates, delivering high-average powers with higher efficiencies and the use of alternative wavelengths: mid-IR facilities. So apart from a comprehensive update of the current global status, we want to look at what technologies are to be deployed to get to these new regimes, and some of the critical issues facing their development.
“…In order to ensure full coherent combination, the full spatiotemporal information of the beams must be measured, including intensity and phase in time and space domains. Advanced diagnostics are therefore required to reconstruct the E-field, such as STRIPED FISH [353] (Spatially and Temporally Resolved Intensity and Phase Evaluation Device: Full Information from a Single Hologram) shown in Figure 40 or TERMITES [354] (Total E-Field Reconstruction using a Michelson Interferometer Temporal Scan).…”
Section: Future Technologiesmentioning
confidence: 99%
“…Figure 40.The schematic of a STRIPED FISH apparatus for single-shot complete spatiotemporal pulse measurement (reproduced from Ref. [353]).…”
In the 2015 review paper ‘Petawatt Class Lasers Worldwide’ a comprehensive overview of the current status of high-power facilities of
${>}200~\text{TW}$
was presented. This was largely based on facility specifications, with some description of their uses, for instance in fundamental ultra-high-intensity interactions, secondary source generation, and inertial confinement fusion (ICF). With the 2018 Nobel Prize in Physics being awarded to Professors Donna Strickland and Gerard Mourou for the development of the technique of chirped pulse amplification (CPA), which made these lasers possible, we celebrate by providing a comprehensive update of the current status of ultra-high-power lasers and demonstrate how the technology has developed. We are now in the era of multi-petawatt facilities coming online, with 100 PW lasers being proposed and even under construction. In addition to this there is a pull towards development of industrial and multi-disciplinary applications, which demands much higher repetition rates, delivering high-average powers with higher efficiencies and the use of alternative wavelengths: mid-IR facilities. So apart from a comprehensive update of the current global status, we want to look at what technologies are to be deployed to get to these new regimes, and some of the critical issues facing their development.
“…Imaging an ultrafast linear optical phenomenon. Simultaneous characterization of an ultrashort light pulse spatially, temporally, and spectrally is essential for studies on laser dynamics 4 and multimode fibers 25 . Here, in the first demonstration, we created a spatially and temporally chirped pulse by a grating pair (Fig.…”
Section: Time Shearingmentioning
confidence: 99%
“…A trade-off between imaging speed and recording time is always found in single-shot ultrafast imaging modalities 7,8,[12][13][14][15][16][17][18][19][24][25][26] . Due to the vast discrepancies in imaging speeds, it is inconvenient to compare different approaches using recording time.…”
Real-time imaging of countless femtosecond dynamics requires extreme speeds orders of magnitude beyond the limits of electronic sensors. Existing femtosecond imaging modalities either require event repetition or provide single-shot acquisition with no more than 10 13 frames per second (fps) and 3 × 10 2 frames. Here, we report compressed ultrafast spectral photography (CUSP), which attains several new records in single-shot multi-dimensional imaging speeds. In active mode, CUSP achieves both 7 × 10 13 fps and 10 3 frames simultaneously by synergizing spectral encoding, pulse splitting, temporal shearing, and compressed sensing-enabling unprecedented quantitative imaging of rapid nonlinear light-matter interaction. In passive mode, CUSP provides four-dimensional (4D) spectral imaging at 0.5 × 10 12 fps, allowing the first single-shot spectrally resolved fluorescence lifetime imaging microscopy (SR-FLIM). As a real-time multi-dimensional imaging technology with the highest speeds and most frames, CUSP is envisioned to play instrumental roles in numerous pivotal scientific studies without the need for event repetition.
“…Generally, the laser peak intensity can be maximized by using a deformable mirror to minimize wavefront aberrations. Even though the wavefront is optimized before focusing, the real peak intensity at the focus may be lower than the expected peak intensity due to the spatiotemporal coupling effect, known as the combination of spatial and temporal effects [17][18][19][20][21]. Namely, the spatial variation of the temporal property of the laser pulse due to spatiotemporal couplings should be considered for the maximum peak intensity because only the spatial property of the laser pulse can be optimized through a wavefront correction.…”
150-TW, 23-fs laser pulses with high spatial and temporal qualities have been generated at 5 Hz from a chirped-pulse amplification Ti:sapphire laser. The temporal and the spatial qualities of the laser pulse were optimized and characterized for high availability in the fields of high-field science and relativistic laser-matter interactions. The pulse duration was optimized by maximizing the spectral bandwidth and by minimizing the spectral phase error. A temporal contrast was enhanced using an ultrafast Pockels cell and a double plasma mirror, and wavefront aberrations were corrected using an adaptive optics system. Spatiotemporal couplings were characterized by measuring a frequency-resolved wavefront to estimate their effect on the peak intensity at the focus. Due to the high spatiotemporal quality resulting from this optimization and characterization of the laser beam, the 5-Hz 150-TW Ti:sapphire laser will be the workhorse for a variety of research on relativistic laser-matter interactions.
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