Gabriel R. Castillo

University of California, San Diego | UCSD · Department of Mechanical and Aerospace Engineering (MAE)

We report on thermally resilient planar waveguides fabricated on nc-YSZ by direct fs-laser inscription in transparent nc-yttria stabilized zirconia (nc-YSZ) polycrystalline ceramic. The waveguides consisted of rectangular sections (4.5 × 2 mm 2) on the surface of the sample. Optical characterization at 633 and 810 nm was performed. We estimate a la...

We report on the fabrication of optical waveguides by ultrafast laser ablation of Al2O3. First, a thin film was grown by atomic layer deposition (ALD) on fused silica substrate, followed by laser ablation micromachining the surface material in order to produce a rib waveguide. A multimode behavior of the waveguide and propagation loss of 3.8 dB/cm...

Dispersion effect in the propagation of pulses through cladding waveguides. • Spatio-spectral and-temporal structure of pulses at the output of waveguides. • A different behavior between mono-modal and multi-modal waveguides is reported. A B S T R A C T Inscription of optical waveguides by direct femtosecond laser irradiation has become a very vers...

We report on the fabrication of depressed cladding waveguides inscribed by direct femtosecond laser pulses irradiation in transparent nc-yttria stabilized zirconia (YSZ) polycrystalline ceramics. The waveguides consisted of two different circular structures with diameters of 30 and 100 $\mu \text{m}$ , and different lengths. Optical characterizati...

We have designed and fabricated photonic structures such as, Y-junctions (one of the basic building blocks for construction any integrated photonic devices) and Mach-Zehnder interferometers, based on circular depressed-cladding waveguides by direct femtosecond laser irradiation in Nd:YAG crystal. The waveguides were optically characterized at 633 n...

Miniature laser sources with on-demand beam features are desirable devices for a broad range of photonic applications. Lasing based on direct-pump of miniaturized waveguiding active structures offers a low-cost but intriguing solution for compact light-emitting devices. In this work, we demonstrate a novel family of three dimensional (3D) photonic...

We report on the fabrication and characterization of femtosecond laser micromachined depressed cladding waveguides in lithium niobate crystal. The cladding structures support two-dimensional guidance of light from the visible to the mid-infrared spectral regimes. Particularly, single-mode propagation of light at a wavelength of 4 μm has been achiev...

We present a laser processing study of optically transparent ytrria stabilized zirconia (YSZ) ceramics (ZrO2-8 mol. % Y2O3) using unamplified femtosecond (fs) laser pulses of a few nJ and high repetition rate (70 MHz). The ceramics were fabricated using current activated pressure assisted densification (CAPAD) and have fine grain size and minimal p...