UV beam-assisted efficient formation of surface relief grating on azobenzene polymers

Wu, Xiao; Nguyen, T.; Ledoux‐Rak, Isabelle; Nguyen, Cong Tu; Lai, Ngoc Diep

doi:10.1007/s00340-012-4987-8

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…The effect of assisting beam on the formation of surface relief grating (SRG), using interference patterns by fully or partially coherent beams, has been reported in azo-polymers, where the azo dye is chemically attached to the polymer main chain, − in contrast to our study where a guest–host system is considered. Indeed, azo dyes are free to rotate in the guest–host system, and the recorded grating corresponds to a contrast of refractive index between the dark and bright areas of the film, whereas in azo-polymers the photorecorded SRG corresponds to a modulation of the film thickness, a feature that is due to photoinduced mass movement of the polymer from the bright to the dark area of the interference pattern.…”

Section: Experiments and Discussionmentioning

confidence: 81%

Photoassisted Holography in Azo Dye Doped Polymer Films

et al. 2016

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Holographic storage is one of the most important applications in the field of optics, especially for recording and retrieving data, and information storage by interference patterns in photosensitive materials are no exception in this regard. In this work, we give evidence that holograms recorded by interference of two coherent laser beams in azo dye doped polymer films can be controlled by a third incoherent assisting laser beam. We show that light diffraction can be increased or decreased by an assisting beam depending on the respective orientation of the polarizations of the recording and the assisting beams. We also found that photomanipulation of polarization holograms, prepared by polarization modulation, does not depend on the polarization of the assisting beam, whereas, photomanipulation of holograms prepared by intensity modulation strongly depends on the polarization of the assisting beam. Photoselection is shown to play a major role in the photoassisted diffraction process.

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Section: Experiments and Discussionmentioning

confidence: 81%

Photoassisted Holography in Azo Dye Doped Polymer Films

et al. 2016

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“…It is possible to inscribe SRG by using interfering beams at different wavelengths − by adding “assisting beams” to increase the isomerization rate, , by using more than two interfering beams, and even when incoherent light is used. , Some examples used pulsed irradiation. − The interference can also be achieved when light is irradiated through a photomask. − Half-grating spacing has also been achieved by Miniewicz and coworkers when they used an s-/p- interference pattern that they attributed to the interference between the zeroth- and first-order scattered beams. Interestingly, elliptic interference patterns can be used to fabricate asymmetric SRG. − For instance, Kawatsuki et al experimented a variety of polarization interference patterns, and they observed the formation of blazed SRG when two orthogonal elliptically polarized light beams where used (Figure a).…”

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

“…It is possible to inscribe SRG by using interfering beams at different wavelengths 284−288 by adding "assisting beams" to increase the isomerization rate, 289,290 by using more than two interfering beams, 291 and even when incoherent light is used. 292,293 Some examples used pulsed irradiation.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

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Precise control over molecular movement is of fundamental and practical importance in physics, biology, and chemistry. At nanoscale, the peculiar functioning principles and the synthesis of individual molecular actuators and machines has been the subject of intense investigations and debates over the past 60 years. In this review, we focus on the design of collective motions that are achieved by integrating, in space and time, several or many of these individual mechanical units together. In particular, we provide an in-depth look at the intermolecular couplings used to physically connect a number of artificial mechanically active molecular units such as photochromic molecular switches, nanomachines based on mechanical bonds, molecular rotors, and light-powered rotary motors. We highlight the various functioning principles that can lead to their collective motion at various length scales. We also emphasize how their synchronized, or desynchronized, mechanical behavior can lead to emerging functional properties and to their implementation into new active devices and materials.

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“…During the past decade, high-power UV lasers have become an integral part of industrial material processing, because of their high photon energy, small focused size and effective absorption [1][2][3]. To speed up the material throughput, much work was dedicated to increase the pulse repetition frequency (PRF) to higher than 100 kHz [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The high-power UV laser is often generated by harmonically converting the output of a master oscillator power amplifier (MOPA) based IR source [8]. Recently, narrow linewidth semiconductor diodes, such as the distributed 1 Author to whom any correspondence should be addressed. feedback (DFB) type, are more and more utilized as the master oscillator [9].…”

Section: Introductionmentioning

confidence: 99%

High-power 355 nm ultraviolet lasers operating at ultrahigh repetition rate

Chen¹,

Liu²,

Yan³

et al. 2012

Laser Phys. Lett.

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In this letter, we demonstrate a novel 355 nm ultraviolet (UV) laser operating at ultrahigh repetition rate from 300 kHz to 1 MHz. The hybrid fiber-MOPA-bulk amplifiers based IR source exhibits a high average power of 105 W with near-diffraction-limited beam quality, narrow linewidth and high polarization extinction ratio. Two-cascaded LBO crystals are employed for high efficiency frequency tripling, and a maximum 43.7 W of average UV power is achieved at 400 kHz, corresponding to a conversion efficiency as high as 41.6%. The pulse duration of the UV pulse can be tuned from 5 to 10 ns with good pulse peak stability (better than 2.2% (RMS)).

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UV beam-assisted efficient formation of surface relief grating on azobenzene polymers

Cited by 11 publications

References 18 publications

Photoassisted Holography in Azo Dye Doped Polymer Films

Photoassisted Holography in Azo Dye Doped Polymer Films

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

High-power 355 nm ultraviolet lasers operating at ultrahigh repetition rate

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