Cover Story

Thermal Radiometer Cconstructed from Ordinary Office Supplies

Terry L. Lyon

It is possible to construct a surprisingly inexpensive and simple thermal radiometer from office supplies. Although the detector was designed to evaluate thermal energy hazards to an individual located in a harsh environment, undoubtedly... more>>

Features

Multilayer Mirrors for X-rays and the Extreme UV

James H. Underwood

Multilayer reflectors for the x-ray and extreme ultraviolet spectral regions—together called the XUV region, and stretching from a few angstroms to about 300 Å—have recently become a practical reality. This is partly a result of advances in vacuum deposition and surface preparation technologies, and partly because of the recent resurgence of interest in optics for this region of the spectrum. In turn, this interest stems from the development of new and intense sources of XUV such as synchrotron radiation and plasma sources, and the realization of the scientific opportunities offered by this region of the spectrum, from x-ray microscopy to x-ray astronomy. more>>


Very Large Optics of the Future

Aden B. Meinel & Marjorie P. Meinel

Optical systems for both astronomy and for defense programs always have been and always will be at the dual limits of technology and cost. There have been a number of significant branching points in the long history of telescopes. A short look backward at the path traversed in the continuing quest for the world's largest is a useful perspective from which to view the future. more>>