Intracavity generation of radially polarized CO_2 laser beams based on a simple binary dielectric diffraction grating

Moser, Tobias; Balmer, J. E.; Delbeke, Danaë; Muys, Peter; Verstuyft, Steven; Baets, Roel

doi:10.1364/ao.45.008517

Cited by 50 publications

(20 citation statements)

References 17 publications

(16 reference statements)

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“…Therefore, it becomes very interesting to implement the cylindrical polarization also in ultrafast systems dedicated to micromachining. Cylindrically polarized laser beams can directly be generated within a laser cavity or by converting linearly polarized beams by means of an extra-cavity polarization converter [3][4][5][6][7]. In the latter case, easy-to-implement and robust segmented wave-plates can be used [8], which are particularly well adapted to high average powers and allows to decrease the constraints on the oscillator, which is especially important for femtosecond oscillators.…”

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confidence: 99%

High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers in cylindrical polarization

et al. 2015

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We demonstrate a three-stage diode-pumped Yb:YAG single-crystal-fiber amplifier to generate femtosecond pulses at high average powers with linear or cylindrical (i.e., radial or azimuthal) polarization. At a repetition rate of 20 MHz, 750-fs pulses were obtained at an average power of 85 W in cylindrical polarization and at 100 W in linear polarization. The report includes investigations on the use of Yb:YAG single-crystal fibers with different length/doping ratio and the zero-phonon pumping at a wavelength of 969 nm in order to optimize the performance.

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confidence: 99%

High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers in cylindrical polarization

et al. 2015

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“…There are several ways to generate radial polarization, such as interferometry, 14,15 liquid crystal devices, 16 optical fibers, [17][18][19] space variant gratings, 20,21 laser intracavity gratings, 22,23 spatial light modulators, 24 and wire grid polarizers (WGPs). 25 WGP will be used here, because it offers highquality performance in the near UV-VIS wavelength range, in particular for the wavelength of 405 nm, a wavelength that can be used for, e.g., optical disc mastering and laser writing.…”

Section: Introductionmentioning

confidence: 99%

Enhanced lithographic resolution using longitudinal polarization state of light

Van

Ushakova

Bastiaansen

et al. 2015

J. Micro/Nanolith. MEMS MOEMS

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Abstract. Laser direct-writing is an important technique for the fabrication of complex patterns. There is a continuous need for structures with increasingly small features, i.e., enhanced resolution. Focused radially polarized light is known to exhibit a narrow longitudinal polarization component. Here, a proof-of-concept is shown of enhanced resolution through polarization-selectivity by the selective recording of the longitudinal polarization component in a polarization-selective homeotropic and smectic B photoresist. The full-width-at-half-maximum (FWHM) of the fabricated spots in the polarization-selective resist is up to 56% smaller compared to the FWHM of the same spot in a photoresist that is not polarization-selective, which supports simulations that predict a theoretical maximum reduction of 62%. © 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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“…Generation of the CVB with radial or azimuthal polarization directly from an active resonator has attained much attention [1][2][3][4] , based on their many significant applications as in particle physics 5 , optical tweezers 6 , high-resolution microscopy 7 and material processing 8 , etc. And now, various techniques are developed to form such beams inside a laser including the utilization of coherent summation 2 or polarization-selective components (for example, axis symmetrically grating 9 and Brewster axicon 4,10,11 ) etc.…”

Section: Introductionmentioning

confidence: 99%

Efficient excitations of radially and azimuthally polarized Nd^3+:YAG ceramic microchip laser by use of subwavelength multilayer concentric gratings composed of Nb_2O_5/SiO_2

Li¹,

Ueda²,

Zhong³

et al. 2008

Opt. Express

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Cylindrical vector beams were produced from laser diode endpumped Nd:YAG ceramic microchip laser by use of two types of subwavelength multilayer gratings as the axisymmetric-polarization output couplers respectively. The grating mirrors are composed of high-and lowrefractive-index (Nb 2 O 5 /SiO 2 ) layers alternately while each layer is shaped into triangle and concentric corrugations. For radially polarized laser output, the beam power reached 610mW with a polarization extinction ratio (PER) of 61:1 and a slope efficiency of 68.2%; for azimuthally polarized laser output, the beam power reached 626mW with a PER of 58:1 and a slope efficiency of 47.6%. In both cases, the laser beams had near-diffraction limited quality. Small differences of beam power, PER and slope efficiency between radially and azimuthally polarized laser outputs were not critical, and could be minimized by further optimized adjustment to laser cavity and the reflectances of respective grating mirrors. The results manifested, by use of the photonic crystal gratings mirrors and end-pumped microchip laser configuration, CVBs can be generated efficiently with high modal symmetry and polarization purity.

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Intracavity generation of radially polarized CO_2 laser beams based on a simple binary dielectric diffraction grating

Cited by 50 publications

References 17 publications

High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers in cylindrical polarization

High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers in cylindrical polarization

Enhanced lithographic resolution using longitudinal polarization state of light

Efficient excitations of radially and azimuthally polarized Nd^3+:YAG ceramic microchip laser by use of subwavelength multilayer concentric gratings composed of Nb_2O_5/SiO_2

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