There are several challenges in the development of semiconductor lasers for the near mid-infrared region of 2-3 μm. Approaches being developed to produce lasers in this range include extending the wavelength of inter-band diode lasers which perform relatively well below ~2.5 μm. Such lasers are, however, strongly affected by increased optical losses and non-radiative Auger recombination which d...

The recent progress in the field of Ti:Er:LiNbO3 waveguide lasers with emission wavelengths in the range 1530 nm < λ < 1603 nm is reviewed. After a short discussion of the relevant fabrication methods concepts and properties of different types of lasers with grating resonator, acoustooptically tunable Fabry Pérot type lasers and new ring laser structures are presented. key words: integrated opt...

High-power and highly directional semiconductor microcylinder lasers based on an optical resonator with deformed cross section are reported. In the favorable directions of the far-field, a power increase of up to three orders of magnitude over the conventional circularly symmetric lasers was obtained. A "bow-tie"-shaped resonance is responsible for the improved performance of the lasers in the ...

A detailed beam characterization of continuous-wave single-frequency Nd:YAG solid-state ring lasers at a wavelength of 1064 nm is presented. The power noise, frequency noise, beam pointing fluctuations, spatial beam quality, and other properties of eight lasers of the same model were measured with a compact diagnostic instrument based on an optical ring resonator. One of the eight lasers was au...

Fiber lasers are rapidly gaining market shares for industrial applications due to compactness, high electrical-to-optical efficiency, high beam quality and low running cost. However, for directed energy weapons, fiber lasers have until now been unable to meet the requirements of military, where power levels around 100 kW are aimed for through combining of multiple, high beam quality lasers. The...

Ceramic laser materials have come a long way since the first demonstration of lasing in 1964. Improvements in powder synthesis and ceramic sintering as well as novel ideas have led to notable achievements. These include the first Nd:yttrium aluminum garnet (YAG) ceramic laser in 1995, breaking the 1 KW mark in 2002 and then the remarkable demonstration of more than 100 KW output power from a YA...

| The discovery and continued development of the laser has revolutionized both science and industry. The advent of miniaturized, semiconductor lasers has made this technology an integral part of everyday life. Exciting research continues with a new focus on nanowire lasers because of their great potential in the field of optoelectronics. In this Review, we explore the latest advancements in the...

discussion: establishing the etiology, using the evidence–based strategies to improve hirsutism, and treating the underlying disorder, are essential for proper management of women with hirsutism. case presentation: the case was a 17-year-old female with severe hirsutism, oligomenorrhea, and obesity. she was evaluated to identify the etiology and diagnosed as a case of polycystic ovarian syndrom...

In this manuscript we discuss state of the art hybrid integration techniques and III-V/Si active components with an emphasis on hybrid distributed feedback (DFB) lasers for telecom applications. We review our work on ultra-compact III-V/Si DFB lasers and further describe design considerations and challenges associated with electrically pumped hybrid lasers. We conclude with a perspective on DFB...

Strained InGaAS/AIGaAS quantum well (QW) lasers operating at 0.98 jim are currently of great interest due to their suitability for pumping erbium-doped fiber amplifiers. They are reported to yield a lower noise figure and higher gain coefficient than the 1 .48 jim InGaAsflnP pump lasers as well as 0.8 p.m A1GaAS/GaAS pump lasers. In addition, the InGa.AS/AIGaAS strained QW lasers have lower thr...