[show abstract][hide abstract] ABSTRACT: We demonstrate a tri-wavelength laser generation from a Nd-doped calcium niobium gallium garnet disordered crystal waveguide. The laser threshold obtained was 83 mW of launched pumping laser corresponding to a slope efficiency of 5.1%. According to the laser spectrum, the output light was found to be a tri-wavelength laser, with wavelengths of 1058 nm, 1060 nm and 1064 nm, respectively. The stability of the output laser was investigated, which found that the output laser was a continuous laser.
[show abstract][hide abstract] ABSTRACT: This work reports on the Q-switched pulsed laser generation from double-cladding Nd:YAG ceramic waveguides. Double-cladding waveguides with different combination of diameters were inscribed into a sample of Nd:YAG ceramic. With an additional semiconductor saturable absorber, stable pulsed laser emission at the wavelength of 1064 nm was achieved with pulses of 21 ns temporal duration and ~14 μJ pulse energy at a repetition rate of 3.65 MHz.
[show abstract][hide abstract] ABSTRACT: A high-gain optical waveguide amplifier has been realized in a channel waveguide platform of Nd:YAG ceramic produced by swift carbon ion irradiation with metal masking. The waveguide is single mode at wavelength of 810 and 1064 nm, and with the enhanced fluorescence intensity at around 1064 nm due to the Nd<sup>3+</sup> ion emissions. In conjunction with the low propagation loss of the waveguide, about 26.3 dB/cm of the small signal gain at 1064 nm is achieved with an 18 ns pulse laser as the seeder under the 810-nm laser excitation. This work suggests the carbon ion irradiated Nd:YAG waveguides could serve as efficient integrated amplifiers for the signal amplification.
[show abstract][hide abstract] ABSTRACT: We report on the fabrication of channel waveguides in ytterbium-doped
yttrium aluminum garnet (Yb:YAG) ceramics by carbon ion implantation. Confocal
microfluorescence experiments revealed that the fluorescence efficiency of
Yb ions is well preserved in the waveguide area, contrary to the case of helium
ion-implanted waveguides characterized by a severe ion implantation-induced
fluorescence quenching at waveguide's volume. The fluorescence images of the
channel waveguides, and its comparison to those obtained from femtosecond
direct laser written Yb:YAG waveguides, have been used to elucidate the waveguide
Journal of Lightwave Technology 05/2011; 29(10):1460-1464. · 2.56 Impact Factor
[show abstract][hide abstract] ABSTRACT: We report on the fabrication of optical channel waveguides supporting both visible and IR TE and TM confinement in a hybrid system composed of a Nd:YVO4 laser gain medium glued to a potassium titanyl phosphate (KTP) nonlinear crystal. The microphotoluminescence and second harmonic confocal images of the fabricated waveguides have revealed that the laser and nonlinear properties of the constituent crystals have not been deteriorated because of the waveguide inscription. The resulting structures emerge as promising candidates for the development of multifrequency waveguide lasers.
[show abstract][hide abstract] ABSTRACT: Continuous-wave waveguide laser at 1064 nm was generated from a femtosecond laser inscribed Nd:YVO4 channel waveguide. Single-mode laser oscillations have been observed with a low threshold power 34 mW and a high slope efficiency 65%.
[show abstract][hide abstract] ABSTRACT: We report on the two-wave mixing of light in photorefractive waveguides in H ion-implanted Fe-doped near-stoichiometric lithium niobate crystals. For pump light of 632.8 nm wavelength a gain coefficient as high as 15 cm−1 is found. A response time of the order of a few seconds is achieved for micro-watt input powers.Research highlights► H implantation forms optical waveguides in Fe doped stoichiometric LiNbO3 crystal. ► Two-wave mixing gain coefficient is 15 cm−1 at 632.8 nm. ► Significant shorter response time than the bulk at very low power is obtained. ► Very good photorefractive features are found in the waveguide.
[show abstract][hide abstract] ABSTRACT: We report high efficiency continuous wave laser oscillations at 1063.6 nm from an ultrafast laser written Nd(3+):GdVO4 channel waveguide under the 808 nm optical excitation. A record 17 mm·s(-1) writing speed was used while the low propagation loss of the waveguide (~0.5 dB·cm(-1)) enabled laser performance with a threshold pump power as low as 52 mW and a near to quantum defect limited laser slope efficiency of 70%.
[show abstract][hide abstract] ABSTRACT: We report on mirrorless continuous wave laser oscillation at 1064 nm from a 808 nm pumped Nd:YAG optical channel waveguide fabricated by 1 MeV focused proton beam writing. Pump power threshold has been found to be 94 mW with a laser slope efficiency of 40%. A maximum output power at 1064 nm for the waveguide laser is 63 mW at absorbed pump power of 247 mW.
[show abstract][hide abstract] ABSTRACT: We investigate light localization at a single phase-slip defect in one-dimensional photonic lattices, both numerically and experimentally. We demonstrate the existence of various robust linear and nonlinear localized modes in lithium niobate waveguide arrays exhibiting saturable defocusing nonlinearity.
[show abstract][hide abstract] ABSTRACT: We report on continuous wave 1064 nm laser generation from an ultrafast laser inscribed neodymium-doped yttrium orthovanadate channel waveguide with pumping at 808 nm. Single-mode stable laser operations have been observed with pump powers at threshold as low as 14 mW and with laser slope efficiencies as high as 38.7%.
[show abstract][hide abstract] ABSTRACT: Optical channel waveguides have been produced for the first time in Nd:LGS multi-functional laser crystals by using proton implantation. The obtained good guiding performance exhibits the well-confined modal fields in the waveguiding structures. The confocal fluorescence images of the obtained waveguides have revealed that the photoluminescence properties of the Nd(3+) ions have been well-preserved in the waveguide's active volume, which suggests promising applications as multi-functional integrated laser generation elements. These images have been also used to elucidate the spatial distribution of lattice damage and distortion caused by the implantation process, which are both mainly located at the nuclear collision region.
[show abstract][hide abstract] ABSTRACT: We report on a new, simple method to fabricate optical ridge waveguides in a z-cut LiNbO3 wafer by using proton implantation and selective wet etching. The measured modal field is well confined in the ridge waveguide region, which is also confirmed by the numerical simulation. With thermal annealing treatment at 400 degrees C, the propagation loss of the ridge waveguides is determined to be as low as approximately 0.9 dB/cm. In addition, the measured thermo-optic coefficients of the waveguides are in good agreement with those of the bulk, suggesting potential applications in integrated photonics.
[show abstract][hide abstract] ABSTRACT: We report on room temperature continuous wave laser generation at ~1062 nm from proton implanted Nd:GGG planar waveguides. Single-mode stable laser operation is realized with an 808-nm pump source, resulting in a laser threshold of ~49.3 mW and slope efficiency of 30%. The maximum output power of ~21.9 mW, an absorbed pump power of ~117.4 mW, leads to an optical-to-optical conversion efficiency of 18.7%.
Journal of Lightwave Technology 01/2010; 28(24):3578-3581. · 2.56 Impact Factor
[show abstract][hide abstract] ABSTRACT: We report on the fabrication of optical channel waveguides in Nd : YAG ceramics by multi-energy proton implantation at a total dose of 8 × 1016 ions cm-2. The modal distribution of the guided modes obtained from numerical calculation was in good agreement with the experimental result. The propagation loss of the waveguide was determined to be ~4 dB cm-1 after post-annealing up to 400 °C in air. Confocal micro-photoluminescence experiments have revealed relevant changes in the Nd spectroscopic properties in the waveguide's active volume. These changes include line broadening and shifting as well as a clear luminescence quenching, which were attributed to the strong structural modifications induced by the high-dose proton implantation.
Journal of Physics D Applied Physics 01/2010; 43(7). · 2.53 Impact Factor
[show abstract][hide abstract] ABSTRACT: We report on the fabrication and characterization of optical-stripe waveguides in neodymium-doped calcium barium niobate (Nd:CBN) crystals by using He ion implantation assisted with a mask. The guided-mode profiles are successfully modeled through numerical simulations. After annealing at 200 degrees C for 30 min, the waveguide propagation loss could be reduced down to ~3 dB/cm. Room-temperature microluminescence and micro-Raman investigations reveal that the crystal bulk features are well preserved in the active volume of the waveguide, suggesting possible applications as integrated photonic devices.