the generation of ultrashort laser pulses. Beginning with mode-locking of
glass lasers in the 1960s, the development of dye lasers brought the pulse
width down from picoseconds to femtoseconds. The breakthrough in solid
state laser pulse generation provided the current reliable table-top laser
systems capable of average power of about 1 watt, and peak power density
of easily watts per square centimeter, with pulse widths in the
range of four to eight femtoseconds.
In 2009 the world celebrated 50 years of lasers, bringing to the attention of the
public how deeply lasers and laser related technologies have revolutionized both
science and everyday life. Next year will be the fiftieth anniversary of the semiconductor
laser. Used as a compact light source with high modulation rates, it
transformed telecommunications in combination with glass fibers. Today laser
diodes are omnipresent in data storage and communication. Still, most of these
applications are based on infrared or red laser diodes.
In 1665, a book was published that inaugurated the use of the microscope to
investigate the natural world. The author was Robert Hooke, a talented artist,
architect, and amateur scientist. Hooke wrote Micrographia: Or Some
Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with
Observations and Inquiries Thereupon, at the behest of the newly chartered
Royal Society in London, for whom he was working as curator of scientific
experiments. In Micrographia, he presented the first detailed observations of
everyday objects made with his self-constructed light microscope....
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Laser-Induced, Polarization Dependent Shape Transformation of Au/Ag Nanoparticles in Glass
The wavelength shift effect of the Whispering Gallery Mode (WGM) laser with Er3+ /Yb3+ co-doped phosphate glass microsphere has been investigated. The experiment was carried out by half fiber taper coupling technique. The microsphere lasers have been pumped at 980 nm to take full advantage of energy transfer effect from ion Ytterbium to ion Erbium. The WGM’s wavelength shift were analyzed for sphere diameters of 90 µm. The observed lasing lines extends from 1532 nm to 1611 nm.
This book contains chapters on nanocomposites for engineering hard materials for high performance aircraft, rocket and automobile use, using laser pulses to form metal coatings on glass and quartz, and also tungsten carbide-cobalt nanoparticles using high voltage discharges. A major section of this book is largely devoted to chapters outlining and applying analytic methods needed for studies of nanocomposites. As such, this book will serve as good resource for such analytic methods.
Cd1-xMnxS nanoparticles (NPs) with size quantum confinement belong to the diluted
magnetic semiconductor (DMS) quantum dot (QD) class of materials that has been widely
studied in the last few years. The study of quasi-zero-dimensional Diluted Magnetic
Semiconductors (DMS), such as Cd1-xMnxS Quantum Dots (QDs), is strongly motivated due
to the localization of magnetic ions in the same places as the free-like electron and hole
carriers occurring in these nanomaterials [1,2].