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

Mohammadian, Nafiseh; Mhibik, Oussama; SeGall, Marc; Yaraghi, Shaghayegh; Glebov, Leonid; Divliansky, Ivan

doi:10.1088/2040-8986/ac2787

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…To achieve the required phase profile for flat-top beam the same basic approach as in Ref. [3][4] was applied for HPM recording, wherein two collimated beams were interfered, with the object beam containing the phase element required to create the mask. A conventional master phase mask or a UV operating SLM is placed into one arm of the holographic recording setup to generate the desired spatial phase profile into the object beam.…”

Section: The Holographic and Characterisation Setupmentioning

confidence: 99%

“…It was shown that holographic phase masks (HPM) recorded in photo-thermo-refractive (PTR) glass are good solution for high power applications [2][3][4] . PTR glass is a sodium-potassium-zinc-aluminum-fluorine-bromine-silicate glass doped with cerium, antimony, tin, and silver, with a region of transparency from 350 nm to 2700 nm and a damage threshold for 30 ns pulses of 40 J/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

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Modeling of laser beam shaping by volume holographic phase masks

Vashchenko

Mohammadian

Divliansky

et al. 2023

Components and Packaging for Laser Systems IX

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Laser material processing applications often require the flat-top beam profile within focal spots ranged below 100 μm. For high power applications, volume phase masks recorded in photo- thermo-refractive glass (PTR) are promising. The problem is how to achieve simultaneously a high-quality shape and a small size of the beam. The commercial phase masks usually show large power losses in the beam wings, only about 40% of the energy was concentrated under the 95% level. By applying a gray phase mask instead of binary mask, one can reduce losses in the wings of the beam. In this work, a spatial light modulator (SLM) with designed computer generated holograms (CGHs) was used as a beam converter. Using the SLM with programmed gray mask allows obtaining flexible laser beam shaping, but beam quality is limited by imposed parameters of the SLM. The requirements for obtaining a square flat-top beam with energy lost in wings less than 10% is described. It was found that for sharp edges of the square flat-top beam, it is necessary that the size of the output beam contains at least 16 pixels of SLM. This fact is a consequence of the Fourier transform, where high spatial frequencies are responsible for the shape. The concept design of the scanning progressive mechanism of the master volume phase mask recording to exclude the influence of SLM work area dimensions is discussed.

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Section: The Holographic and Characterisation Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of laser beam shaping by volume holographic phase masks

Vashchenko

Mohammadian

Divliansky

et al. 2023

Components and Packaging for Laser Systems IX

Self Cite

View full text Add to dashboard Cite

show abstract

Tissue engineered scaffold fabrication methods for medical applications

Chimerad

Barazesh

Zandi

et al. 2022

International Journal of Polymeric Materials and Polymeric Biom

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Intracavity spatial mode conversion by holographic phase masks

et al. 2022

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Past beam-shaping techniques, developed to transform a Gaussian beam into other waveforms, rely on a wide selection of available tools ranging from physical apertures, diffractive optical elements, phase masks, free-form optics to spatial light modulators. However, these devices – whether active or passive – do not address the underlying monochromatic nature of their embedded phase profiles, while being hampered by the complex, high-cost manufacturing process and a restrictive laser-induced damage threshold. Recently, a new type of passive phase devices for beam transformation – referred to as holographic phase masks (HPMs), was developed to address these critical shortcomings. In this work, we demonstrated the first integration of HPMs into a laser cavity for the generation of arbitrary spatial modes. Our approach allowed for different phase patterns to be embedded into the outputs of a laser system, while preserving the spatial structure of its intracavity beams. The optical system further possessed a unique ability to simultaneously emit distinct spatial modes into separate beampaths, owning to the multiplexing capability of HPMs. We also confirmed the achromatic nature of these HPMs in a wavelength-tunable cavity, contrary to other known passive or active beam-shaping tools. The achromatism of HPMs, coupled to their ability to withstand up to kW level of average power, makes possible future developments in high-power broadband sources, capable of generating light beams with arbitrary phase distribution covering any desirable spectral regions from near ultraviolet to near infrared.

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

Cited by 4 publications

References 32 publications

Modeling of laser beam shaping by volume holographic phase masks

Modeling of laser beam shaping by volume holographic phase masks

Tissue engineered scaffold fabrication methods for medical applications

Intracavity spatial mode conversion by holographic phase masks

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