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Uniform irradiation of adjustable target spots in high-power laser driver |
Applied Optics, Vol. 50, Issue 27, pp. 5213-5220 (2011)
http://dx.doi.org/10.1364/AO.50.005213
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Abstract
For smoothing and shaping the on-target laser patterns flexibly in high-power laser drivers, a scheme has been developed that includes a zoom lens array and two-dimensional smoothing by spectral dispersion (SSD). The size of the target pattern can be controlled handily by adjusting the focal length of the zoom lens array, while the profile of the pattern can be shaped by fine tuning the distance between the target and the focal plane of the principal focusing lens. High-frequency stripes inside the pattern caused by beamlet interference are wiped off by spectral dispersion. Detailed simulations indicate that SSD works somewhat differently for spots of different sizes. For small spots, SSD mainly smooths the intensity modulation of low-to-middle spatial frequency, while for large spots, SSD sweeps the fine speckle structure to reduce nonuniformity of middle-to-high frequency. Spatial spectra of the target patterns are given and their uniformity is evaluated.
© 2011 Optical Society of America
OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(140.3300) Lasers and laser optics : Laser beam shaping
(260.2030) Physical optics : Dispersion
(350.2660) Other areas of optics : Fusion
ToC Category:
Lasers and Laser Optics
History
Original Manuscript: May 16, 2011
Revised Manuscript: July 6, 2011
Manuscript Accepted: July 12, 2011
Published: September 12, 2011
Citation
Xiujuan Jiang, Jinghui Li, Huagang Li, Yang Li, and Zunqi Lin, "Uniform irradiation of adjustable target spots in high-power laser driver," Appl. Opt. 50, 5213-5220 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-27-5213
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