Carolina Romero

Universidad de Salamanca

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Javier R. Vázquez de Aldana

Universidad de Salamanca

Xavier Mateos

Universidad Rovira i Virgili

Feng Chen

State Key Laboratory of Crystal Materials

Francesc Dı́az

Universidad Rovira i Virgili

Magdalena Aguiló

Universidad Rovira i Virgili

Pavel Loiko

Université de Caen Normandie

Esrom Kifle

Centre de Recherche sur les Ions, les Matériaux et la Photonique

Valentin Petrov

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Uwe Griebner

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Jı Eun Bae

Korea Advanced Institute of Science and Technology

Cooperative Institutions

Universidad de Salamanca

Centre National de la Recherche Scientifique

Shandong University

Universidad Rovira i Virgili

State Key Laboratory of Crystal Materials

Chinese Academy of Sciences

Consejo Superior de Investigaciones Científicas

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Université de Caen Normandie

Centre de Recherche sur les Ions, les Matériaux et la Photonique

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Compact Q-switched vortex waveguide laser modulated by buried Ag nanoparticles in SiO2

Optics & Laser Technology (2024)

Wenqing Sun Fengqin Liu Jing Guan Carolina Romero Javier R. Vázquez de Aldana

Waveguide

Optical vortex

10.1016/j.optlastec.2024.111394

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Optical ridge waveguides in Yb:YAG laser crystal produced by combination of swift carbon ion irradiation and femtosecond laser ablation

Optics & Laser Technology (2015)

Yazhou Cheng Jinman Lv Shavkat Akhmadaliev Irene Hernández-Palmero Carolina Romero

Ytterbium

Waveguide

Crystal (programming language)

10.1016/j.optlastec.2015.03.018

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Citations (15)

Watt-Level Er:YAlO3 Waveguide Laser at 2920 nm

Jı Eun Bae Pavel Loiko Carolina Romero Javier R. Vázquez de Aldana Weidong Chen

Depressed-cladding low-loss (0.12 dB/cm) buried channel waveguides are produced in an Er:YAlO 3 crystal by femtosecond direct laser writing. The waveguide laser delivers 1.12 W at 2920 nm with a linear polarization in a single-mode output.

Watt

Waveguide

10.1364/assl.2024.atu4a.6

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Properties of a radial mode CO<inf>2</inf>laser

IEEE Journal of Quantum Electronics (1973)

Lee W. Casperson Carolina Romero

The properties of a new class of lasers are investigated theoretically and experimentally. In these lasers, the radiation propagates radially within a disk-shaped amplifying medium resulting in high fields and symmetric illumination at the resonator axis. Experiments have been conducted using a pulsed CO 2 TEA configuration.

10.1109/jqe.1973.1077490

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Citations (9)

Efficient quasi-phase-matching in fan-out PPSLT crystal waveguides by femtosecond laser direct writing

Optics Express (2019)

Lingqi Li Carolina Romero Javier R. Vázquez de Aldana Lei Wang Yang Tan

We demonstrate second harmonic generations in quasi-phase matched cladding waveguide structures fabricated by direct femtosecond laser writing.Waveguides with circular section are inscribed in z-cut MgO doped stoichiometric lithium tantalate with fan-out χ (2) grating structures.The ferroelectric domain-inverted fan-out grating period seamlessly varies from 7.5 to 8.2 µm.Seven individual waveguides with step changed periods are fabricated.The minimum insertion loss of the cladding waveguides is about 0.54 dB at wavelength of 1064 nm.Temperature tuned second harmonic generations of 1064 nm for different quasi phase matched grating periods are demonstrated by using continuous wave and pulsed laser.A comparable normalized conversion efficiency of 3.55%/(W•cm 2 ) is obtained for 7.91 µm period.The maximum power conversion efficiency of 54.3% was obtained under a pump peak power of 282 W.

Cladding (metalworking)

Lithium tantalate

10.1364/oe.27.036875

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Citations (15)

Multi-gigahertz mode-locked femtosecond Yb:KLuW waveguide lasers

Photonics Research (2022)

Jı Eun Bae Xavier Mateos Magdalena Aguiló Francesc Dı́az Javier García Ajates

We demonstrate multi-gigahertz continuous-wave mode-locking of a Yb:KLuW waveguide laser. A femtosecond-laser-inscribed Yb:KLuW channel waveguide in an extended laser cavity delivers a fundamentally mode-locked laser near 1030 nm. A tunable few-centimeter-long cavity containing a single-walled carbon nanotube saturable absorber as mode-locker generates self-starting femtosecond pulses with average output powers exceeding 210 mW at repetition rates of 2.27, 2.69, and 3.55 GHz. The laser cavity, which includes a wedged waveguide, is extended by using a lens pair that controls the laser fluence on the saturable absorber for reliable mode-locked operation without instability. The presented laser performance, mode-locked up to 3.55 GHz, highly suggests the potential of crystalline Yb:KLuW waveguides for realizing high-power ultrafast lasers with higher GHz repetition rates in a quasi-monolithic cavity.

Saturable absorption

Waveguide

Mode-Locking

Optical cavity

10.1364/prj.471688

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Citations (15)

Fs-laser-written erbium-doped double tungstate waveguide laser

Optics Express (2018)

Esrom Kifle Pavel Loiko Carolina Romero Javier R. Vázquez de Aldana Airán Ródenas

We report on the first erbium (Er3+) doped double tungstate waveguide laser. As a gain material, we studied a monoclinic Er3+:KLu(WO4)2 crystal. A depressed-index buried channel waveguide formed by a 60 µm-diameter circular cladding was fabricated by 3D femtosecond direct laser writing. The waveguide was characterized by confocal laser microscopy, µ-Raman and µ-luminescence mapping, confirming that the crystallinity of the core is preserved. The waveguide laser, diode pumped at 981 nm, generated 8.9 mW at 1533.6 nm with a slope efficiency of 20.9% in the continuous-wave regime. The laser polarization was linear (E || Nm). The laser threshold was at 93 mW of absorbed pump power.

Slope efficiency

Tungstate

Waveguide

Cladding (metalworking)

Erbium

10.1364/oe.26.030826

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Citations (12)

Room-temperature subnanosecond waveguide lasers in Nd:YVO4 Q-switched by phase-change VO2: A comparison with 2D materials

Scientific Reports (2017)

Weijie Nie Rang Li Chen Cheng Yanxue Chen Qingming Lu

Abstract We report on room-temperature subnanosecond waveguide laser operation at 1064 nm in a Nd:YVO 4 crystal waveguide through Q-switching of phase-change nanomaterial vanadium dioxide (VO 2 ). The unique feature of VO 2 nanomaterial from the insulating to metallic phases offers low-saturation-intensity nonlinear absorptions of light for subnanosecond pulse generation. The low-loss waveguide is fabricated by using the femtosecond laser writing with depressed cladding geometry. Under optical pump at 808 nm, efficient pulsed laser has been achieved in the Nd:YVO 4 waveguide, reaching minimum pulse duration of 690 ps and maximum output average power of 66.7 mW. To compare the Q-switched laser performances by VO 2 saturable absorber with those based on two-dimensional materials, the 1064-nm laser pulses have been realized in the same waveguide platform with either graphene or transition metal dichalcogenide (in this work, WS 2 ) coated mirror. The results on 2D material Q-switched waveguide lasers have shown that the shortest pulses are with 22-ns duration, whilst the maximum output average powers reach ~161.9 mW. This work shows the obvious difference on the lasing properties based on phase-change material and 2D materials, and suggests potential applications of VO 2 as low-cost saturable absorber for subnanosecond laser generation.

Waveguide

Saturable absorption

Pulse duration

Cladding (metalworking)

Q-switching

10.1038/srep46162

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Citations (11)

Near-Infrared Femtosecond Direct Laser Written Waveguide Lasers [Invited]

2022 International Conference Laser Optics (ICLO) (2020)

Pavel Loiko Esrom Kifle Carolina Romero Javier R. Vázquez de Aldana Tae Gwan Park

We present an overview of our recent achievements on fabrication, characterization and CW and passively Q-switched laser operation of Thulium and Holmium depressed-cladding waveguide lasers operating at ~2 μm and inscribed in anisotropic crystals by femtosecond direct laser writing. Variable waveguide geometries (buried and surface guides; circular, rectangular and hexagonal channels; Y-splitters) are described.

Cladding (metalworking)

Inscribed figure

Waveguide

Thulium

10.1109/iclo48556.2020.9285574

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Therapeutic laser guidelines: On the effects of laser radiation on human skin-fibroblast metabolism in culture

Lasers in Medical Science (1989)

M. A. Trelles F. Dalmases José Viña Carolina Romero Josepa Rigau

10.1007/bf02276668

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