Scaling the spectral beam combining channels in a multiplexed volume Bragg grating

Ott, Daniel; Divliansky, Ivan; Anderson, Brian; Venus, George; Glebov, Leonid

doi:10.1364/oe.21.029620

Cited by 32 publications

(13 citation statements)

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“…[31][32][33] It has been used in a variety of applications, including producing volume phase masks 20 and holograms for pulse stretching/compression 34 as well as coherent and spectral beam combining. [35][36][37] To fabricate the HPM, a four-sector binary phase mask 20 designed for the recording wavelength of 325 nm was placed in one arm of the setup and the half angle of interference was set to 0.786 deg, giving a grating period of 8 μm. The phase mask was placed approximately 150 mm from the sample.…”

Section: Hpmsmentioning

confidence: 99%

“…To perform beam combining, we utilize the same approach used in multiplexed volume gratings, where the periods and tilts of each grating are adjusted so that probe beams of different wavelengths and angles of incidence will diffract into the same channel. [35][36][37] Here, we encode each grating with the appropriate phase profile so that each grating will also simultaneously perform mode conversion. To demonstrate this, we created two free-space converting/combining systems, illustrated in Fig.…”

Section: Simultaneous Mode Conversion and Beam Combiningmentioning

confidence: 99%

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Holographically encoded volume phase masks

et al. 2015

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Abstract. We present here a method to create spectrally addressable phase masks by encoding phase profiles into volume Bragg gratings, allowing these holographic elements to be used as phase masks at any wavelength capable of satisfying the Bragg condition of the hologram. Moreover, this approach enables the capability to encode and multiplex several phase masks into a single holographic element without cross-talk while maintaining a high diffraction efficiency. As examples, we demonstrate fiber mode conversion with near-theoretical conversion efficiency as well as simultaneous mode conversion and beam combining at wavelengths far from the original hologram recording wavelength. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Hpmsmentioning

confidence: 99%

Section: Simultaneous Mode Conversion and Beam Combiningmentioning

confidence: 99%

Holographically encoded volume phase masks

et al. 2015

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“…The feasibility of the approach was proven and demonstrated in [20] where a double-multiplexed VBG recorded in the PTR glass was used to combine three laser beams. As a first step, the authors combined the two reflected by the MVBG beams to realize a total power of 282 W with combining efficiency of 99%.…”

Section: Spectral and Coherent Laser Beam Combining By Volume Bragg Gmentioning

confidence: 99%

Volume Bragg Gratings: Fundamentals and Applications in Laser Beam Combining and Beam Phase Transformations

Divliansky¹

2017

Holographic Materials and Optical Systems

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Two major volume Bragg grating (VBG) applications will be presented and in particular laser beam combining and holographically encoded phase masks. Laser beam combining is an approach where multiple lasers are combined to produce more power. Spectral beam combining is a technique in which different wavelengths are superimposed spatially (combined) using a dispersive element such as a volume Bragg grating. To reduce the complexity of such combining system instead of multiple individual VBGs, it will be demonstrated that a single holographic element with multiple VBGs recorded inside could be used for the same purpose. Similar multiplex volume holographic elements could be used for coher ent beam combining. In this case, the gratings operate at the same wavelength and have degenerate output. Such coherent combining using gratings written in photothermorefractive (PTR) glass will be discussed. The chapter also demonstrates that binary phase profiles may be encoded into volume Bragg gratings, and that for any probe beam capable of satisfying the Bragg condition of the hologram, this phase profile will be present in the diffracted beam. A multiplexed set of these holographic phase masks (HPMs) can simultaneously combine beams while also performing mode conversion. An approach for making HPMs fully achromatic by combining them with a pair of surface gratings will be outlined.Keywords: holography, volume Bragg gratings, beam combining, phase plates, photothermo refractive glass, multiplexed volume gratings © 2017 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Volume Bragg gratings Description and propertiesVolume grating as its name suggest is a grating that occupies the volume of a medium. Typically, for such gratings the term volume Bragg gratings (VBGs) is used in relation to Sir William Bragg who in 1915 used diffraction of light propagating through a crystal to determine the crystal's lattice structure [1]. What he found was that at certain conditions the light is strongly diffracted by the crystal. Such condition is called "resonant condition" or also "Bragg condition." Here is also the place to make the distinction between surface and volume Bragg gratings. If we start with a surface grating and start increasing its thickness at some point the different diffraction orders will reduce to a moment where there will be only one order. This defines the transition to a volume grating behavior [2].There are two basic types of VBGs which is shown in Figure 1. The first one is a transmission Bragg grating (TBG) for which if the incident light satisfies the Bragg condition it is not transmitted but also diffracted. The second type is a reflection Bragg grating (RBG) which behaves like a mirror for incoming light that matches the Bragg condition.For simplicity, in Figure 1, fo...

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“…Ранее уже неоднократно рассматривались мультиплексоры на данном материале, как на отдельно стоящих решетках под каждый лазер [2][3][4][5][6][7][8][9], так и на системах наложенных голограмм [10][11][12][13][14], однако все ранее рассмотренные методы использовали отражательные решетки для сложения пучков. В настоящей работе мы рассмотрим мультиплексор на основе пропускающих брэгговских решеток, а также особенно-сти записи наложенных голограмм в ФТР-стекле.…”

Section: Introductionunclassified