A simple method for the production of a polarised Nd:Y Al O on Y Al O planar waveguide laser is reported. 3 5 12 3 5 12 A 50nm layer of Au deposited on the surface of an unclad, 8.3 μm thick core region has produced an improvement in the TE/TM polarisation extinction ratio from 7dB to 27dB. The M of the beam in the guided 2 plane has been reduced from 1.53 ±0.04 in an uncoated region of the wav...

The operation of a mid-infrared laser at 2244 nm in a Cr:ZnS polycrystalline channel waveguide fabricated using direct femtosecond laser writing with a helical movement technique is demonstrated. A maximum power output of 78 mW and an optical-to-optical slope efficiency of 8.6% are achieved. The compact waveguide structure with 2 mm length was obtained through direct femtosecond laser writing, ...

This Letter reports a nonlinear directional waveguide coupler written by ultrafast laser in gallium lanthanum sulfide chalcogenide glass. The nonlinear waveguide device is tested with laser pulses input in two orthogonal polarizations, and all optical switching at 1040 nm between the two coupled waveguides is observed at a peak fluence of 16 GW/cm2. The spectra and autocorrelation measurement f...

This diploma thesis deals with physical effects in the light output of a vertical cavity surface emitting laser (VCSEL) diode caused by external optical feedback. Such feedback might be induced by reflections from the beginning of a optical waveguide due to a connected refractive index step. The thesis also investigates the influence on waveguide coupled power on opto-electronic waveguide board...

endonasal endoscopic laser-assisted dacryocystorhinostomy has many advantages over conventional external dacryocystorhinostomy. this technique avoids a cutaneous scar and causes less surgical trauma and bleeding than that seen in conventional lacrimal surgery. a total of 20 endoscopic laser-assisted dacryocystorhinostomy in 16 patients were performed between 1998 and 1999. the procedure was suc...

background. failure of orthodontic bracket bonds is a common occurrence during orthodontic treatment. different tech-niques have been suggested in the literature to remove resin residues from the bracket bases and enamel surfaces to prepare the surfaces again after debonding. this study attempted to compare multiple rebond shear strengths (sbs) of debonded brackets following preparation with sa...

background and objective: genital warts, due to specific types of the human papillomavirus, have long been regarded as one of the most important causes of cervical cancer and one of the most common cause of sexually transmited diseases (stds).  over the years, it has been the focus of several studies in order to find the best effective approach to eradicate the virus, however there are still co...

We have proposed a tunable laser with silica-waveguide ring resonators. In this tunable laser, a semiconductor optical amplifier was passively aligned and mounted onto a silica-waveguide substrate. The ring resonators can be tuned by controlling their temperatures using the thermo optic heaters formed on them, and there are no mechanically moving parts. Thus, they are sufficiently stable and re...

used in conjunction with or as a replacement for traditional methods, it is expected that specific laser technologies will become an essential component of contemporary dental practice over the next decade. the current review is designed to focus on the acid resistance of laser application and tries to introduce laser settings capable to achieve this feature for clinical application. applicatio...