The increased magnification is just a side benefit. For this to work the distance between lens and paper has to be held within a somewhat narrow ...

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In contrast, telescopes with a short focal length are faster. They display a brighter image and, for astrophotography, require a shorter exposure time for the same result. However the decisive characteristic for the "speed" of an optics, is not just the focal length, but also the aperture ratio, that is the ratio of aperture to the focal length. There is a separate glossary entry relating to aperture ratios.

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Compared to the aperture, the focal length of a telescope is not such an important parameter. The following rule applies: the longer the focal length, the less the image needs to be enlarged with an eyepiece. Higher magnification is therefore possible with a telescope with a long focal length. But the field of view is however smaller.

NIF experiments are highly diagnosed to provide unprecedented insights into HED systems, and are complemented by other experimental facilities at LLNL and elsewhere.

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The Beam Splitter is designed to be used with the Brewster's Angle Accessory and the Educational Spectrophotometer System.

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Fresnel lenses consist of a flat surface with interspaced, concentric steps whereby each step corresponds to the surface of a conventional ...

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In support of NIF’s stockpile stewardship mission, the laser system’s unique capabilities are creating unprecedented opportunities for research in the growing field of high energy density (HED) science—the study of matter under extreme states of density and pressure (about 1 Mbar to 1 Gbar, or one million to one billion times the atmospheric pressure at Earth’s surface).

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Telescopes with a long focal length are generally more stable and less susceptible to optical aberration, since the light is less refracted and needs to be reflected through a smaller angle in order to reach the focal point.

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HED research is opening new frontiers in materials science research. Researchers have developed new capabilities for measuring the basic properties of matter, such as the equation of state (EOS) at the highest pressures ever achieved in a controlled laboratory experiment.

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By recreating the properties of celestial objects under scaled conditions in the laboratory, NIF enables scientists to explore extreme conditions such as the hot dense plasmas found in stars (see Discovery Science). LLNL researchers have long been interested in the physical processes of stars because the prime stellar energy mechanism, thermonuclear burn, is central to the Laboratory’s core mission of maintaining the safety, security, and reliability of the nation’s nuclear weapons stockpile.

HED experiments also support other national security-related studies on such topics as radiation hydrodynamics, system-generated electromagnetic pulses (see “NIF Experiments Help Validate Electromagnetic Pulse Codes”), and energy transport through electromagnetic waves (see “Experiments Yield Insights into Supersonic Radiation Flow”).

Data from HED experiments help inform and validate 3D weapon simulation computer codes and bring about a fuller understanding of weapon physics. Many NIF shots focus on advancing the prospect of inertial confinement fusion (ICF) ignition—a self-sustaining fusion reaction—for the Stockpile Stewardship Program.

NIF’s HED science program provides experimental data that yields important information on the characteristics of materials used in nuclear weapons as they age or are subjected to the immense pressures and temperatures of a thermonuclear explosion (see NIF and Stockpile Stewardship).

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“From microjoules to megajoules and kilobars to gigabars: Probing matter at extreme states of deformation,” Physics of Plasmas, September 17, 2015

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