Achromatic complex holograms for laser mode conversion

Divlianksy, Ivan; Hale, Evan R.; SeGall, Marc; Glebov, Leonid

doi:10.1364/oe.27.000225

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…The first approach to extending the operating bandwidth of HPMs was demonstrated in [22]. This work capitalized on the angular dispersion compensation produced by a system of two surface diffraction gratings with a single VBG placed between them [23].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, after three sequential diffractions, the broadband beam would be collimated while having a lateral spectral chirp. An HPM recorded in PTR glass was incorporated into such a three-grating-system [22]. It was found that the HPM became achromatic over a spectral range exceeding 1000 nm, enabling applications such as femtosecond broadband beam conversion from TEM 00 to TEM 11 .…”

Section: Introductionmentioning

confidence: 99%

“…A simplification of broadband HPM was achieved by utilizing VBGs with large periods [24], enabling the elimination of the surface gratings used in [22] due to the large spectral selectivity of the VBG. Specifically, the spectral selectivity of VBGs recorded in PTR glass can achieve tens of nanometers for grating periods one the order of several microns and thicknesses of a few millimeters.…”

Section: Introductionmentioning

confidence: 99%

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Versatile approach to laser beam shaping and analyzing by holographic phase masks

Mohammadian

Mhibik

SeGall³

et al. 2021

J. Opt.

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A new technology that includes a flexible holographic recording system using photo-thermo-refractive (PTR) glass is demonstrated for creating so-called 'holographic phase masks' or HPMs. These diffractive optical elements are permanently recorded in the PTR glass, can be multiplexed as with normal holograms, do not require electric power to operate, and can perform near arbitrary beam phase transformations. The holographic setup includes a spatial light modulator that enables recording transmitting volume Bragg gratings (VBGs) with arbitrary phase patterns encoded into them. As a result, the desirable phase pattern is introduced in a beam that is diffracted by the VBG. These HPMs are tunable within the visible and near IR spectral regions and can be made achromatic, with spectral widths of up to 50 nm. Furthermore, they tolerate laser power densities on the order of several kW cm −2 . Applications of HPMs include high-power, broadband laser beam shaping and modal analysis of complex beams profiles, both of which are demonstrated here.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%