(a) and (b) A cylindrical lens produces a line focus. (c) Streak image with a cylindrical lens coupling. (d) Spatial profile shows modulations from the hot spots. (e) Temporal profile is distorted by the hot spots.
(a) A 10° divergence angle in the spatial direction achieved a 6.1 mm spot size along the slit. (b) A 0.4° divergence angle in the temporal direction achieved a 270 μm spot size across the slit. (c) A streak image of a 180 ps (FWHM) laser pulse obtained with the 10° × 0.4° diffuser, (d) spatial profile, and (e) temporal profile.
(a) and (c) Streaked image and temporal profiles obtained through a cylindrical lens. Temporal profiles were distorted by the hot spots in ROI2. (b) and (d) Streaked image and temporal profiles obtained through a 10° × 0.4° diffuser. Temporal profiles are consistent across the spatial direction.
The impulse response of the streak camera using the 10° × 0.4° diffuser was identical to the one that was previously obtained with a cylindrical lens. The FWHM pulse width was 2.5 ± 0.5 ps.
Space-charge-broadening calibration for stretcher positions of 16 mm, 40 mm, and 80 mm denoted as S = 16 mm, S = 40 mm, and S = 80 mm.
Inverse relation between space-charge broadening and pulse width.
Comparison of results from space-charge-broadening calibration and EPSys prediction.
(a) Uniform streak image is achieved on high-energy laser shots; (b) the measured pulse shape agrees with the model prediction.
(a) The space-charge-broadening calibrated pulse measurement gives 8.7 ps. (b) Three autocorrelation measurements, in conjunction with a decorrelation factor of 1.36 from modeling, give a pulse width of 8.5 ps.
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