We report quantum cascade laser (QCL) master-oscillator power-amplifiers (MOPAs) at 300 K reaching output power of 1.5 W for tapered devices and 0.9 W for untapered devices. The devices display single-longitudinal-mode emission at λ = 7.26 µm and single-transverse-mode emission at TM(00). The maximum amplification factor is 12 dB for the tapered devices.

The progressive reduction of velocitygradient to keep the flocculation rate as high as possible without breakage of flocsis called 'tapered flocculation'. In the present work, an attempt has been made to compare the performance of continuous tapered flocculationin conicaland cylindricaltanks. The efficiencyof conical flocculator was found to be higher than that of cylindrical flocculator, espec...

CLINICAL/SURGICAL PEARLS: 1. Determining the highest level of supportive femoral bone is important to place the taper into this bone. An extended trochanteric osteotomy is useful for removal of the old stem and facilitates placement of a relatively straight, tapered, fluted stem down a bowed femur, thus preventing anterior perforation of the stem through the anterior cortex. The intact diaphysi...

Adiabatically tapered holey fibers are shown to be potentially useful for guided-wave spot-size and numerical aperture conversion. Conditions for adiabaticity and design guidelines are provided in terms of the effective index model. We also present finite-difference time-domain calculations of down-tapered holey fiber, showing that large spot size conversion factors are obtainable with minimal ...

We examine similarities and differences between high-power parabolic pulse generation in an active medium and in tapered fiber with decreasing normal dispersion. Using a realistic tapered fiber design, we demonstrate the possibility of parabolic pulse generation without an external pump and determine the limitations of this approach.

a Nonlinear Physics Centre and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia b Department of Radio Science and Engineering, Aalto University, Aalto 00076, Finland c St. Petersburg University for Information Technologies, Mechanics, and Optics (ITMO), St. Petersburg 1971...

OBJECTIVES The aim of this study was to evaluate the sealing ability of lateral compaction and tapered single cone gutta-percha techniques in root canals prepared with stainless steel and rotary nickel titanium root canal instruments by fluid filtration method. STUDY DESIGN The root canals were prepared with stainless steel (SS) and nickel titanium (NiTi) instruments. The canals prepared with...

PURPOSE To study the clinical/radiographic outcomes and stability of a tapered implant design with a hydrophilic surface when placed in the maxilla using various protocols and followed for one year. METHODS Ninety-seven consecutive patients treated as part of daily routine in two clinics with 163 tapered implants in healed sites, in extraction sockets and together with bone augmentation proce...

Microfabricated tapered pits in vivo can stimulate connective tissue and bone attachment to percutaneous devices, secondarily preventing epithelial migration, and promoting long-term implant survival. Epithelial cells, which form a seal with a dental implant, acting as a barrier, and osteoblasts, which form bone, can come into contact with the same implant topography. To investigate whether the...