Volume Bragg grating external cavities for the passive phase locking of high-brightness diode laser arrays: theoretical and experimental study

Pabœuf, David; Vijayakumar, Deepak; Jensen, Ole Bjarlin; Thestrup, B.; Lim, J.J.; Sujecki, S.; Larkins, E.C.; Lucas-Leclin, Gaëlle; Georges, Patrick

doi:10.1364/josab.28.001289

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…where N is the number of emitters, w is the mode size of emitter, and x i is the position of emitter [47][48][49]. In our calculations, we used the parameters from our experiment: the pitch of array (d = 200 μm), the emission mode size (40 μm, emission mode size is altered with V-shaped feedback), and center wavelength (λ = 800 nm).…”

Section: Resultsmentioning

confidence: 99%

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

Liu¹,

Braiman²

2013

Opt. Express

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We explored a path of achieving high quality phase-locking of broad-area laser diode (BALD) array that operates at high electrical to optical power conversion efficiency (PCE). We found that (a) improving single transverse mode control for each individual BALD, (b) employing global Talbot optical coupling among diodes, and (c) enhancing strength of optical coupling among diodes are key factors in achieving high quality phase-locking of high power BALD array. Subsequently, we redesigned and improved a V-shaped external Talbot cavity and employed low reflectivity anti-reflection (AR) coated, low-"smile" BALD array to meet these three important requirements. We demonstrated near-diffraction limit far-field coherent pattern with 19% PCE and 95% visibility. The far-field angle (full-width at half-maximum (FWHM)) of center lobe was measured as 1.5 diffraction angular limited with visibility of 99% for 5A injection current and 1.6 diffraction angular limited with visibility of 95% for 14A injection current. Power scaling of diode array is discussed.

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Section: Resultsmentioning

confidence: 99%

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

Liu¹,

Braiman²

2013

Opt. Express

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“…These elements are used for a wide range of applications [22][23][24]. Thanks to their high angular selectivity [25], transmitting Bragg gratings have been thoroughly used for the selection of transverse mode and phase locking of multimode lasers [26,27]. Reflecting Bragg gratings have shown a wide range of applications, such as notch filters for Raman spectroscopy [28], external couplers for longitudinal mode selection in laser systems [29,30], or angularly and spectrally selective elements in spectral or coherent beam combining of high energy lasers [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

A review of the photo-thermal mechanism and crystallization of photo-thermo-refractive (PTR) glass

Lumeau

Zanotto

2016

International Materials Reviews

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International audiencePhoto-thermo-refractive (PTR) glass is an optically transparent photosensitive multicomponent silicate glass. UV-exposure produces silver nanoclusters, and NaF nanocrystals upon heating, giving rise to permanent refractive index changes. This is the basis for the production ofBragg gratings. In this article, we present a comprehensive overview of the photo-thermoinduced effects in PTR glass. We first give a general introduction of PTR glasses and their applications. Then, we perform a thorough analysis of the mechanisms of refractive index changes starting with the photo-induced process followed by the crystal nucleation mechanism and NaF crystallisation kinetics. Finally, we concentrate on the PTR glassnanostructure and its effect on the crystallisation mechanisms and properties, finishing with the kinetics and origin of the refractive index change. Despite the fact that much is known about this septuagenarian glass and that it is already being commercially produced, a number of open problems still exist that warrant further investigation

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“…[1]. So far, this effect has been applied in laser array illumination, the interference measurement, condensation of pulse, laser phase clocking, and even enhancement of the nonlinear effect [2][3][4][5], and it has also been involved in many research fields including nonlinear optics, atomic physics, and Bose-Einstein. The Talbot effect of gratings has been attracting lots of research interest [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Talbot effect of quasi-periodic grating

Zhang

et al. 2013

Appl. Opt.

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Theoretic and experimental studies of the Talbot effect of quasi-periodic gratings are performed in this paper. The diffractions of periodic and quasi-periodic square aperture arrays in Fresnel fields are analyzed according to the scalar diffraction theory. The expressions of the diffraction intensities of two types of quasi-periodic gratings are deduced. Talbot images of the quasi-periodic gratings are predicted to appear at multiple certain distances. The quasi-periodic square aperture arrays are produced with the aid of a liquid crystal light modulator, and the self-images of the quasi-periodic gratings are measured successfully in the experiment. This study indicates that even a structure in short-range disorder may take on the self-imaging effect in a Fresnel field.

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Volume Bragg grating external cavities for the passive phase locking of high-brightness diode laser arrays: theoretical and experimental study

Cited by 12 publications

References 27 publications

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

A review of the photo-thermal mechanism and crystallization of photo-thermo-refractive (PTR) glass

Talbot effect of quasi-periodic grating

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