Refractive-index profiling of optical fibers with axial symmetry by use of quantitative phase microscopy

Roberts, Ann; Ampem-Lassen, Eric; Barty, Anton; Nugent, Keith A.; Baxter, Gregory W; Dragomir, Nicoleta; Huntington, S.T.

doi:10.1364/ol.27.002061

Cited by 81 publications

(53 citation statements)

References 13 publications

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“…All the sample waveguides were inspected using the quantitative phase microscopy (QPM) method [12,13], from which a cumulative index profile over the radial distance from the central axis of the waveguide can be obtained. The peak cumulative index change in the inner and outer regions of the waveguide and the effective diameters of the two modified regions of the waveguide are defined in Fig.…”

Section: Fabrication Of the Waveguidesmentioning

confidence: 99%

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Inscription and characterization of waveguides written into borosilicate glass by a high-repetition-rate femtosecond laser at 800 nm

et al. 2010

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A series of waveguides was inscribed in a borosilicate glass (BK7) by an 11 MHz repetition rate femtosecond laser operating with pulse energies from 16 to 30 nJ and focused at various depths within the bulk material. The index modification was measured using a quantitative phase microscopy technique that revealed central index changes ranging from 5 × 10 −3 to 10 −2 , leading to waveguides that exhibited propagation losses of 0:2 dB=cm at a wavelength of 633 nm and 0:6 dB=cm at a wavelength of 1550 nm with efficient mode matching, less than 0:2 dB, to standard optical fibers. Analysis of the experimental data shows that, for a given inscription energy, the index modification has a strong dependence on inscription scanning velocity. At higher energies, the index modification increases with increasing inscription scanning velocity with other fabrication parameters constant.

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Section: Fabrication Of the Waveguidesmentioning

confidence: 99%

“…The radial refractive index profiles of the waveguides were reconstructed from the cumulative phase data obtained from QPM using the Abel inverse transform method [12,13]. To implement an Abel transform, it must be assumed that the waveguide is radially symmetric about its axis.…”

Section: Fabrication Of the Waveguidesmentioning

confidence: 99%

Inscription and characterization of waveguides written into borosilicate glass by a high-repetition-rate femtosecond laser at 800 nm

et al. 2010

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“…This method derives quantitative phase measurements from images captured using a bright-field microscope without phase or interference contrast optics. It is a performant and non destructive imaging technique allowing the direct observation of refractive index variations across a transversal section of objects such as optical fibers [19].…”

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confidence: 99%

Erbium emission properties in nanostructured fibers

et al. 2009

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A new route was recently proposed to modify some spectroscopic properties of rare-earth ions in silica-based fibers. We had shown the incorporation of erbium ions in amorphous dielectric nanoparticles, grown in fiber preforms. Here we present the achieved stabilization of nanometric erbium-doped dielectric nanoparticles within the core of silica fibers. We present the nanoparticle dimensional characterization in fiber samples. We also show the spectroscopic characterisation of erbium in preform samples with similar nanoparticle size and composition. This new route could have important potentials in improving rare-earth doped fibre amplifiers and laser sources.

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“…The sample tracks were inspected using the quantitative phase microscopy (QPM) method [30,31] at the microscope (commercial software by IATIA), from which a cumulative phase profile and, hence, refractive index distribution over the radial distance from the central axis of the track can be obtained. The QPM technique relies on taking multiple images of the intensity distribution of the field leaving a phase object at different focus distances (an in-focus image and a number of slightly positively and negatively defocused images) and using these data to estimate the differential with respect to the defocus of the image for phase recovery [30,32]. Thus, it is clear that accurate positioning of the object along the z axis is very important for the extraction of correct phase information.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Microstructured waveguides in z-cut LiNbO_3 by high-repetition rate direct femtosecond laser inscription

Dubov

Boscolo

Webb

2014

Opt. Mater. Express

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Abstract:We report on the operational parameters that are required to fabricate buried, microstructured waveguides in a z-cut lithium niobate crystal by the method of direct femtosecond laser inscription using a highrepetition-rate, chirped-pulse oscillator system. Refractive index contrasts as high as −0.0127 have been achieved for individual modification tracks. The results pave the way for developing microstructured WGs with low-loss operation across a wide spectral range, extending into the mid-infrared region up to the end of the transparency range of the host material.

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Refractive-index profiling of optical fibers with axial symmetry by use of quantitative phase microscopy

Cited by 81 publications

References 13 publications

Inscription and characterization of waveguides written into borosilicate glass by a high-repetition-rate femtosecond laser at 800 nm

Inscription and characterization of waveguides written into borosilicate glass by a high-repetition-rate femtosecond laser at 800 nm

Erbium emission properties in nanostructured fibers

Microstructured waveguides in z-cut LiNbO_3 by high-repetition rate direct femtosecond laser inscription

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