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With the invention of modern navigational tools, the lighthouse has become largely obsolete for maritime safety. But the lens invented for it lives on in side mirrors used on trucks, solar panels, and photographic lighting equipment.

Fresnel Effect

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In addition, the College of Engineering is home to the Center for Ultrafast Optical Science (CUOS), the country’s foremost center for academic research in ultrafast science. The Center’s research focuses on the development of high peak-power optical sources; ultrafast electronic and optical science; high field physics and technology; and development and application of short wavelength, short pulse optical sources with intensities exceeding 10E22 watts/cm2 (presently the world’s record for on-target intensity). Although most students work with faculty in the EECS Department, it is also possible to conduct research with faculty in other departments working on problems such as laser cooling and trapping of atoms, coherent control and wave function engineering in atomic systems, optical metamaterials, and phonons in solids.

Fresnel’s technical achievement is worthy of being named an IEEE Milestone, according to the IEEE History Center, but no one has proposed it yet. Any IEEE member can submit a milestone proposal to the IEEE History Center. The Milestone program honors significant accomplishments in the history of electrical and electronics engineering.

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In 1823 the French Commission on Lighthouses committee approved the use of the Fresnel lens in all lighthouses in France. That same year, the first one was installed in the Cordouan Lighthouse, in southwestern France. The lens eventually was adopted in other countries. By the 1860s, all the lighthouses in the United States had been fitted with a Fresnel lens, according to the Smithsonian Institution.

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Because of increasing complaints from French fishermen and ship captains about the poor quality of the light emanating from lighthouses, in 1811 the French Commission on Lighthouses established a committee under the authority of the Corps of Bridges and Roads to investigate how lighthouse illumination could be improved.

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If you are interested in submitting a proposal, do so here.The History Center is funded by donations to the IEEE Foundation. For more on the history of lighthouse technology, visit the U.S. National Park Service, Ponce Inlet Lighthouse and Museum, and American Physical Society websites.

A clock mechanism, which had to be wound by hand every few hours, was used to revolve the metal frame around the lamps to produce unique light patterns for specific lighthouses. A lighthouse could send out a flash regularly every 5 seconds, for example, or it could have a 10-second period of darkness and a 3-second period of brightness. Captains counted the number of flashes sent out by a lighthouse to calculate their ships’ location.

Ships today use satellite-based radio navigation, GPS, and other tools to prevent accidents. But back at the beginning of the 19th century, lighthouses guided ships away from rocky shores using an oil lamp placed between a concave mirror and a glass lens to produce a beam of light.

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Fresnel light

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He decided he could do better using his wave theory. His design consisted of 24 glass prisms of varying shapes and sizes arranged in concentric circles within a wire cage. The prisms, placed both in front of and behind four oil lamps, replaced both the mirror and the glass lens of the previous method. Prisms at the edge of the circle refract light slightly more than those closer to the center, so the light rays all emerge in parallel. The design could focus nearly 98 percent of the rays generated by the lamps, producing a beam that could be seen more than 32 kilometers away.

Fresnel screen

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Fresnel’s analysis of contemporary lighthouse technology found the lenses were so thick that only half the light produced shined through.

Fresnel continued to modify the lens for several years. His final design, which he completed in 1825, could spin 360 degrees and was the first so-called fixed/flashing lens. It produced a fixed light followed by a brilliant flash followed by another fixed light.

The lenses came in several sizes, known as orders. The largest order, the Hyper-Radial, had a 1,330-millimeter diameter. The smallest, the eighth order, had a 75-mm diameter and could be found in lighthouses on bays and rivers.

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Optical science at Michigan has a rich tradition in optics dating back to the early 1960’s, when Professor Emmett Leith with Juris Upatnieks first developed optical holography and Professor Peter Franken in Physics discovered second harmonic generation. Since then, optics has continued to grow at the University, which is now home to over 25 faculty across numerous departments and colleges who are involved in state-of-the-art research and engineering in modern optics and photonics. Nine faculty have their primary home in the Optics and Photonics Lab in EECS.

One member of that committee was Fresnel, who worked for the French civil service corps as an engineer. He had considerable expertise in optics and light waves. In fact, in 1817 he proved that his wave theory—which stated the wave motion of light is transverse rather than longitudinal—was correct. In transverse waves, a wave oscillates perpendicular to the direction of its travel. Longitudinal waves, like sound, oscillate in the same direction that the wave travels.

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Fresnellens

The Optics and Photonics laboratories conduct research in the general areas of photonics, quantum optoelectronics, and ultrafast optical science. Specific areas presently under investigation include nonlinear optics, optical MEMS (coupling optical fields to mechanical motion), ultrafast optics, semiconductor quantum optoelectronics, Terahertz generation and applications, fiber and integrated photonics and lasers, high-power fiber lasers, x-ray and EUV generation, quantum optics and quantum computing, optical microcavities, nanophotonics, spectroscopy of single quantum dots, biophotonics, and biophysical studies of biomolecular structure.

Finally, many optics faculty are part of the National Science Foundation’s first Frontiers in Physics Center at Michigan. This center, known as Frontiers in Optical Coherence and Ultrafast Science (FOCUS), includes faculty from EECS, NERS, Space Physics, Physics and Chemistry.

I've been looking for the formulas to used to calculate the focal lengths of the different order lights. My understanding is that these are differential equations, but that's as far as I've been able to get (since I can't read French, Fresnel's writings are inaccessible). If anyone has a clue about these formulas, please reply here or email me at

In 1822 French civil engineer Augustin-Jean Fresnel (pronounced “Frey Nel”) invented a new type of lens that produced a much stronger beam of light. The Fresnel lens is still used today in active lighthouses around the world. It also can be found in movie projectors, magnifying glasses, spacecraft, and other applications.

As a boater and general aviation pilot I wouldn't call light houses at all obsolete, they provide additional situational awareness and backup in the event of the failure of other systems such as GNSS (GPS). In Australia at least it was not uncommon to have "lighthouses" at most medium to small aerodromes as an additional aid to navigation although these are slowly disappearing. Within 40NM, I'd still pick an airfield light house over GNSS if I had the choice.

The mirrors were not very effective, though, and the lenses were murky. The light was difficult to see from a distance on a clear night, let alone in heavy fog or a storm.

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