ISSN:0031-9228    

DOI:10.1063/1.2814549

出版商:AIP    

年代:1985

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2814550

出版商:AIP    

年代:1985

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2814551

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

There was to have been a birthday party last September in Gerald Gabrielse's lab at the University of Washington. But, sadly, the young honoree met an untimely end just two months shy of its first birthday. Having inadvertently been allowed a bit too much axial excitation, it collided with the cap electrode of the Penning trap that had been its home for more than ten months, and vanished.

ISSN:0031-9228    

DOI:10.1063/1.2814552

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

The storm of controversy surrounding the site selection for the European Synchrotron Radiation Facility has tended to obscure the prodigious scientific and technological import of this proposed new x‐ray source. The ESRF, a 776‐meter‐circumference storage ring for 5‐ or 6‐GeV electrons, would be the first synchrotron radiation ring designed explicitly for undulator and wiggler sources of hard‐x‐ray beams. Most high‐energy synchrotron light sources, having begun life as electronpositron storage rings for high‐energy physics, are not optimized for synchrotron radiation, and they have little room for inserting undulators and wigglers.

ISSN:0031-9228    

DOI:10.1063/1.2814553

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

This issue is devoted to what is variously called optoelectronics or photonics, and I have been privileged to assistPHYSICS TODAYas a guest editor in the coverage of this sparkling field. Photonics and microelectronics are the two key technologies of the rapidly growing information industry, and their advances are complementing each other in the tasks of the acquisition, transmission, storage and processing of increasing amounts of information. The principal technical elements of photonics are the photonic semiconductor devices, such as the junction laser, and the optical fibers made of fused silica. Advances in photonics are already making significant contributions to the transmission of information via optical fibers, to the high‐capacity mass storage of information in laser disks, and to the acquisition of information with the help of optical fiber sensors. The first article, by Tingye Li (on page 24), presents a review and perspective of the lightwave transmission technology via optical fibers. Yasuharu Suematsu (on page 32) presents an overview of semiconductor junction lasers, which represent a central building block of photonics; progress in this field has allowed a shift of operation to the optimal wavelengths for fiberoptics and has led to significant improvements of laser reliability and spectral purity. Aram Mooradian (on page 42) deals with the ultimate limitations to the spectral purity or coherence of lasers, which are determined by the interplay of such fundamental processes as the spontaneous and stimulated emission of radiation. The fourth and final article, by Daniel S. Chemla (on page 56), describes new vistas opened up for photonic devices by the new physics and materials science of quantum wells in semiconductors, and sketches some potential applications. Fascinating as they are, these four reviews of selected areas of progress in photonics represent only an incomplete illustration of the whole field, which is advancing on a broad front.PHYSICS TODAYhopes to cover related topics in future issues.

ISSN:0031-9228    

DOI:10.1063/1.2814554

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

In less than 20 years, the transmission of information by optical fibers has advanced from a mere theoretical proposal to a pervasive commercial reality. The rapid progress that has led to important applications (figure 1) has been marked by innovative breakthroughs as well as steady advances in all areas of lightwave technology. The demonstration of the laser in 1960 sparked intense interest in light as a medium for transmitting information. At that time, scientists began extensive research on optical devices, techniques and subsystems for processing signals, and on a variety of transmission media such as line‐of‐sight atmospheric paths and beam waveguides with periodic focusing elements. During the early 1960s, work on optical fibers as waveguides was mainly theoretical, as the available glass fibers exhibited transmission losses around 1000 decibels per kilometer—about two orders of magnitude too large for use in telecommunications.

ISSN:0031-9228    

DOI:10.1063/1.880971

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

In the past decade the semiconductor laser—also known as the diode or junction laser—has become a key device in optical electronics because of its pure output spectrum and high quantum efficiency. Not coincidentally, its output can be modulated at very high speeds; this property and its compact size make it useful in a vast range of applications, from fiber‐optic communications to optical radar.

ISSN:0031-9228    

DOI:10.1063/1.880972

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

One of the most important properties of laser light is its spectral purity and coherence. This unique quality has been important for the study of many new physical phenomena using laser sources that operate from the vacuum ultraviolet to the far infrared. An understanding of the mechanisms responsible for the broadening of the linewidth is necessary for the development of laser sources with sufficient spectral purity for various applications.

ISSN:0031-9228    

DOI:10.1063/1.880973

出版商:AIP    

年代:1985

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2814555

出版商:AIP    

年代:1985

数据来源: AIP