Ultrafast-laser inscription of a three dimensional fan-out device for multicore fiber coupling applications

Thomson, Robert R.; Bookey, Henry T.; Psaila, N. D.; Fender, A.; Campbell, Stuart; MacPherson, William N.; Barton, James S.; Reid, Derryck T.; Kar, A. K.

doi:10.1364/oe.15.011691

Cited by 166 publications

(59 citation statements)

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“…Although permanent structural modifications can be attained by crystallization processes in the nanosecond range [4], when intense ultra-short laser pulses are tightly focussed inside transparent materials, nonlinear absorption in the focal volume takes place, leading to weak local refractive index variations or to different kinds of damage [1][2][3][5][6][7]. Stress-induced waveguides produced by the processing of buried single and pair of tracks have been studied along the last decade in crystalline and glassy matrices doped with rare earths (RE) since their interest for the production of active photonic devices [8][9][10][11][12][13][14][15][16].…”

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confidence: 99%

Stress-induced buried waveguides in the 0.8CaSiO3–0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

Sola

Mendibil

Aldana

et al. 2013

Applied Surface Science

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a b s t r a c tIn this work the fabrication of buried optical waveguides by femtosecond laser inscription in the 0.8CaSiO 3 -0.2Ca 3 (PO 4 ) 2 eutectic glass doped with Nd 3+ ions is reported. The glass samples were prepared by melting the eutectic powder mixture in a Pt-10 wt.% Rh crucible at 1600 • C and pouring it in a preheated brass mould. Afterwards, the glass was annealed to release the inner stresses. Buried waveguides were fabricated by focusing beneath the surface a pulsed Ti:sapphire laser with a pulsewidth of 120 fs working at 1 kHz. Two adjacent parallel tracks were written to define a region where an increase in the refractive index occurs. The effects produced by the variation of the laser pulse energy as well as the lateral separation between tracks, scanning speed and focusing distance were studied. After the laser processing, the near-field intensity distribution at 633 nm of the waveguide's modes was studied demonstrating the confinement of both, the TE as the TM polarizations. In order to diminish the losses induced by colour centres absorption, heat treatments were carried out in the samples. The waveguide's modes were compared with respect to the samples without heat treatments. The spectroscopic properties of the neodymium ions have been characterized to evaluate in what extent their optical properties could be modified by the waveguide fabrication process and to elucidate the potential application of such waveguides as integrated laser sources.

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Stress-induced buried waveguides in the 0.8CaSiO3–0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

Sola

Mendibil

Aldana

et al. 2013

Applied Surface Science

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“…The waveguides having circular cross section are expected to possess lower losses as compared to the ones with elliptical cross sections. There have been several recent studies [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] investigating the fabrication of waveguide lasers, microfluidic structures, and Fiber Bragg gratings in variety of glasses. Baccarat glass is a potential glass in telecom spectral range and the possibility of making passive photonic structures in these glasses along with the capability of LDW to fabricate photonic devices in passive/active glasses augers well for the telecommunication applications.…”

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confidence: 99%

Micro-Raman mapping of micro-gratings in Baccarat glass directly written using femtosecond laser

Vishnubhatla

Rao²,

Kumar³

et al. 2008

SPIE Proceedings

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We present some of our results on the femtosecond laser direct writing and characterization of micro-gratings in Baccarat glass. Gratings were inscribed with amplified 800 nm, ~100 femtosecond pulses at 1 kHz repetition rate. The change in refractive index of the modified region was estimated from grating efficiency measurements and was found to be ~10 -3 . Micro-Raman studies demonstrated an increase in the intensity of the band near 596 cm -1 in the laser irradiated region clearly indicating an increase in the refractive index. Micro-Raman mapping of the grating showed a periodic variation of the band intensity further confirming the formation of grating. Structures with sub wavelength dimensions (<800 nm) were achieved with shaping of the input pulses using a rectangular slit. Waveguides were inscribed by optimizing parameters like slit width, focusing conditions, translation speed etc. We shall present our results on the physical, spectroscopic and optical characterization of these structures.

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“…Since the first work reported by Davis, 1 optical waveguides have been produced in a great variety of optical materials such as glasses and crystals, including rare-earth doped dielectric materials with the purpose of fabricating active integrated optical devices. [2][3][4] Ultrafast laser inscription uses focused femtosecond laser pulses to induce a permanent positive or negative refractive index change in the focal volume of the dielectric media. When intense ultra-short laser pulses are tightly focused inside transparent materials, nonlinear absorption in the focal volume takes place, leading to different kinds of lattice damage, modifying the local refractive index and forming the so called "track" or "filament."…”

Section: Introductionmentioning

confidence: 99%

Ultrafast direct laser writing of cladding waveguides in the 0.8CaSiO3-0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

Mendívil

Sola

Aldana

et al. 2015

Journal of Applied Physics

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We report on tubular cladding optical waveguides fabricated in Neodymium doped WollastoniteTricalcium Phosphate glass in the eutectic composition. The glass samples were prepared by melting the eutectic powder mixture in a Pt-Rh crucible at 1600 C and pouring it in a preheated brass mould. Afterwards, the glass was annealed to relieve the inner stresses. Cladding waveguides were fabricated by focusing beneath the sample surface using a pulsed Ti:sapphire laser with a pulsewidth of 120 fs working at 1 kHz. The optical properties of these waveguides have been assessed in terms of near-field intensity distribution and transmitted power, and these results have been compared to previously reported waveguides with double-line configuration. Optical properties have also been studied as function of the temperature. Heat treatments up to 700 C were carried out to diminish colour centre losses where waveguide's modes and transmitted power were compared in order to establish the annealing temperature at which the optimal optical properties were reached. Laser experiments are in progress to evaluate the ability of the waveguides for 1064 nm laser light generation under 800 nm optical pumping. V C 2015 AIP Publishing LLC.

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Ultrafast-laser inscription of a three dimensional fan-out device for multicore fiber coupling applications

Cited by 166 publications

References 0 publications

Stress-induced buried waveguides in the 0.8CaSiO3–0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

Stress-induced buried waveguides in the 0.8CaSiO3–0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

Micro-Raman mapping of micro-gratings in Baccarat glass directly written using femtosecond laser

Ultrafast direct laser writing of cladding waveguides in the 0.8CaSiO3-0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

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