Photonics Research, Volume. 6, Issue 6, 542(2018)
Chirp control of femtosecond-pulse scattering from drag-reducing surface-relief gratings
Fig. 1. (a) Scanning electron microscope (SEM) image and schematic, three-dimensional representation of the riblet structure under study. (b) Scheme of the optical setup of the riblet sensor described in Refs. [8,9]: the laser beam is incident normal to the riblet sample’s surface, and the intensity distribution of the scattered light is detected in the 0° and
Fig. 2. (a) Scheme of the pulse front reflected in the 45° direction and distinct pulse path lengths from next-neighboring riblet flanks. Period
Fig. 3. (a) First setup: the laser beam is incident via mirrors M1–M3 normal to the riblet sample’s surface and the scattered intensity pattern is observed on a screen or detected via a photodiode array in the 45° direction. The initial pulse duration is
Fig. 4. (a) Intensity patterns of the 45° signal obtained with the first setup for pulse durations of (1) 109 fs, (2) 234 fs, (3) 370 fs, (4) 680 fs, and (5) 900 fs, respectively. (b)–(e) Photographs of the intensity patterns (b), (c) at 900 fs and (d), (e) with a continuous-wave laser (
Fig. 5. Intensity pattern as a function of slit aperture
Fig. 6. Numeric energy pattern
Fig. 7. Plot of frequency
Fig. 8. Influence of structure period
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Juliane Eggert, Bjoern Bourdon, Stefan Nolte, Joerg Rischmueller, Mirco Imlau. Chirp control of femtosecond-pulse scattering from drag-reducing surface-relief gratings[J]. Photonics Research, 2018, 6(6): 542
Category: Ultrafast Optics
Received: Jan. 22, 2018
Accepted: Mar. 13, 2018
Published Online: Jul. 2, 2018
The Author Email: Mirco Imlau (mimlau@uos.de)