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A brief history of optics
| ~300 BC | Euclid of Alexandria, noted in his Optica, that light travels in straight lines. He described the law of reflection. He believed that vision involves rays going from the eyes to the object seen. He studied the relationship between the apparent sizes of objects and the angles that they subtend at the eye |
| Probably between 100 BC and 150 AD |
Hero (also known as Heron of Alexandria), showed in his Catoptrica, by a geometrical method, that the actual path taken by a ray of light reflected from a plane mirror is shorter than any other reflected path that might be drawn between the source and point of observation. |
| ~140 AD | A twelfth-century Latin translation from the Arabic, credits Ptolemy of Alexandria with a study of refraction, including atmospheric refraction. Ptolomy asserted that the angle of refraction is proportional to the angle of incidence. |
| 965-1020 | Ibn-al-Haitham (also known as Alhazen or Ibn Sahl) was born in Basra, Iraq. He used spherical and parabolic mirrors and was aware of spherical aberration. He used a geometric constriction (ratio of lengths) that is equivalent to Snell's law in a manuscript written in 984, in which he discussed the shape of an aspherical lens to focus light without distortions. He also investigated atmospheric refraction. Ibn-al-Haitham's work was translated into Latin and became accessible to later European scholars. |
| ~1220 | Robert Grosseteste was Magister Scholarum of the University of Oxford (England) and a proponent of the view that theory should be compared with observation. Grosseteste considered the properties of light to have particular significance in natural philosophy and stressed the importance of mathematics and geometry in their study. He believed that colors are related to intensity and that they extend from white to black, white being the purest and lying beyond red with black lying below blue. The rainbow was conjectured to be a consequence of reflection and refraction of sunlight by layers in a 'watery cloud' but the effect of individual droplets was not considered. He held the view, shared by the earlier Greeks, that vision involves emanations from the eye to the object perceived. |
| ~1267 | Roger Bacon (England), was a follower of Grosseteste at Oxford. Bacon extended Grosseteste's work on optics. He considered that the speed of light to be finite and he believed that light is propagated through a medium in a manner analogous to the propagation of sound. In his Opus Maius, Bacon described his studies of the magnification of small objects using convex lenses. He suggested that a lens could be used to correct defective eyesight. He attributed the phenomenon of the rainbow to the reflection of sunlight from individual raindrops. |
| ~1270 | Witelo (Silesia), completed his Perspectiva in 1270. It became a standard text on optics for several centuries. Witelo described a method of machining parabolic mirrors from iron and carried out careful observations on refraction. He recognized that the angle of refraction is not proportional to the angle of incidence but was unaware of total internal reflection. |
| 1303 | Bernard of Gordon (France) was a Physician. He mentioned the use of spectacles as a way of correcting long-sightedness. |
| 1304~1310 | Theodoric (Dietrich) of Freiberg, explained the rainbow as a consequence of refraction and internal reflection within individual raindrops. He gave an explanation for the appearance of a primary and secondary bow but, following earlier notions, he considered color to arise from a combination of darkness and brightness in different proportions. |
| ~1590 | Zacharius Jensen (Netherlands), constructed a compound microscope with a converging objective lens and a diverging eye lens. |
| 1602 | The first discoverer of Snell's law, Thomas Harriot, based his1602 findings, on his own observations made in 1597-98. He died before publishing his work. |
| 1604 | Johannes Kepler (Germany), in his book Ad Vitellionem Paralipomena, suggested that the intensity of light from a point source varies inversely with the square of the distance from the source, that light can be propagated over an unlimited distance and that the speed of propagation is infinite. He explained vision as a consequence of the formation of an image on the retina by the lens in the eye and correctly described the causes of long-sightedness and short-sightedness. |
| 1608 | Hans Lippershey (Netherlands), constructed a telescope with a converging objective lens and a diverging eye lens. A telescope of this nature is now known as a Galilean telescope. |
| 1609 | Galileo Galilei (Italy), constructed his own version of Lippershey's telescope and started to use it for astronomical observations. |
| 1610 | Galileo Galilei (Italy), reported several astronomical discoveries, including that Jupiter has four moons. |
| 1611 | Johannes Kepler (Germany), in his Dioptrice, Kepler presented an explanation of the principles involved in convergent/divergent lens microscopes and telescopes. In the same treatise, he suggested that a telescope could be constructed using a converging objective and a converging eye lens and described a combination of lenses that would later become known as the telephoto lens. He discovered total internal reflection, but was unable to find a satisfactory relationship between the angle of incidence and the angle of refraction. |
| ~1618 | Christopher Scheiner, constructed a telescope of the type suggested by Kepler with converging objective and eye lenses. This type of telescope has since become known as the 'astronomical telescope'. It is uncertain when the first such instrument was constructed. |
| 1621 | Willebrord Snell (Leiden), rediscovered the relationship between the angle of incidence and the angle of refraction when light passes from one transparent medium to another. The finding was not published before his death in 1626.. |
| 1637 | René Descartes independently derived the Snell's law in terms of sines in his 1637 treatise Discourse on Method, and used it to solve a range of optical problems. In French, Snell's Law is called "la loi de Descartes" or "loi de Snell-Descartes". Descartes was the first person to publish the law of sines. |
| 1647 | Cavalieri derived a relationship between the radii of curvature of the surfaces of a thin lens and its focal length. |
| 1657 | Pierre de Fermat (France), enunciated his principle of 'least time', according to which, a ray of light follows the path which takes it to its destination in the shortest time. This principle is consistent with Snell's law of refraction. |
| 1663 | James Gregory (England), suggested the use of a converging mirror for the objective of a telescope as a cure for aberrations. |
| 1665 | Francesco Maria Grimaldi (Italy), in a book entitled Physico-Mathesis de lumine, coloribus et iride published posthumously, reported observations of diffraction. He described white light was a fluid, that exhibited wave-like motion. |
| 1665 | Robert Hooke (England), in his treatise, Micrographia, describe observations with a compound microscope with a converging objective lens and a converging eye lens. In the same work, he described his observations of the colors produced in flakes of mica, soap bubbles and films of oil on water. He recognized that the color produced in mica flakes is related to their thickness but was unable to establish any definite relationship between thickness and color. Hooke advocated a wave theory for the propagation of light. |
| 1666 | Isaac Newton (England), described the splitting up of white light into its component colors when it is passed through a prism. |
| 1668 | Isaac Newton (England), constructed, the first reflecting
 telescope
as a solution to the problem of chromatic aberration. He polished
two silver mirrors to a higher standard than currently available.
He kept one for himself and presented the other to the Royal
Society. Both have now been 'lost'. |
| 1669 | Erasmus Bartholinus (Denmark), described double refraction in calcite. |
| 1672 | Isaac Newton (England), reported his earlier observations on the dispersion of sunlight as it passed through a prism to the Royal Society. Newton concluded that sunlight is composed of corpuscles of different colors (sizes) which are refracted by glass to different extents. |
| 1676 | Olaf Rmer (Denmark), deduced that the speed of light is finite from detailed observations of the eclipses of the moons of Jupiter. From Rmer's data, a value of about 2 x 108 m/s is obtainable. |
| 1678 | Christiaan Huygens (Netherlands), in a communication to the Academie des Science in Paris, propounded his wave theory of light (published in his Traite de Lumiere in 1690). He considered that light is transmitted through an all-pervading aether that is made up of small elastic particles, each of which can act as a secondary source of wavelets. On this basis, Huygens explained many of the known propagation characteristics of light, including the double refraction in calcite discovered by Bartholinus. |
| 1704 | Isaac Newton (England), writing in Opticks, which he published himself, put forward the view that light is corpuscular, partly because he believed light to travel in straight lines, and he knew that waves bend into a shadow region. |
| 1727 | James Bradley (England), calculated the speed of light from observations of the 'aberration' of light from stars, an apparent motion of a star arising from the value of the speed of light in relation to the speed of the Earth in its orbit. |
| 1733 | Chester More Hall constructed an achromatic compound lens using components made from glasses with different refractive indices. [Newton, 150 years earlier, had believed this to be impossible, because he had decided (wrongly) that dispersion is proportional to refractive index and consequencly he believed all glasses to refract in the same way.] |
| 1752 | Thomas Melvill (Scotland), observed that the spectra of flames into which metals or salts have been introduced show bright lines characteristic of what has been introduced into the flame. |
| 1801 | Thomas Young (Scotland), provided support for the wave theory by demonstrating the interference of light, by interrupting a narrow beam of sunlight in a darkened room with a sliver of card, one thirteenth of and inch wide. |
| 1802 |
William Hyde Wollaston (England), discovered that the spectrum of sunlight is crossed by a number of dark lines. He did not interpret them in accordance with current explanations. [Phil.Trans.Roy.Soc., London. p365, 1802] At about the same time Wollaston used a converging meniscus lens, mounted with the concave surface forward, in a camera obscura. His lens enlarged the usable field of view, over that produced by a biconvex lens. |
| 1808 | Etienne Louis Malus (France), observed light reflected from the windows of the Palais Luxembourg in Paris through a calcite crystal as it was rotated. Malus discovered an effect that later led to the conclusion that light can be polarized by reflection. |
| 1814 | Joseph Fraunhofer (Germany), rediscovered the dark lines in the solar spectrum noted by Wollaston and determined their position with improved precision. |
| 1815 | David Brewster (Scotland), described the polarization of light by reflection. |
| 1816 | Augustin Jean Fresnel (France), presented a rigorous treatment of diffraction and interference phenomena showing that they can be explained in terms of a wave theory of light. |
| 1816-1817 | As a result of investigations by Fresnel and Dominique Francois Arago on the interference of polarized light and their subsequent interpretation by Thomas Young, it was concluded that light waves are transverse and not , as had been previously thought, longitudinal. |
| 1819 | Joseph Fraunhoffer (Germany), described investigations of the diffraction of light by gratings which were initially made by winding fine wires around parallel screws. |
| 1821 | Augustin Jean Fresnel (France), presented the laws which enable the intensity and polarization of reflected and refracted light to be calculated. |
| 1823 | Joseph Fraunhoffer (Germany), published his theory of diffraction. |
| 1828 | William Nicol (Scotland), invented a polarizing prism made from two calcite components. The device became known subsequently as a "nicol prism". |
| 1834 | John Scott Russell (Scotland), observed a 'wave of translation' caused by a boat being drawn along the Union Canal in Scotland, and noted how it traveled great distances without apparent change of shape. Such waves subsequently became known as 'solitary waves' and their study led to the idea of solitons, optical analogues of which have been propagated in optic fibers. [Report of the 14th meeting of the British Association for the Advancement of Science, p311, 1844]. |
| 1835 | George Airy (England), calculated the form of the diffraction pattern produced by a circular aperture. |
| 1845 | Michael Faraday (England), described the rotation of the plane of polarized light that is passed through glass in a magnetic field (the Faraday effect). |
| 1849 | Armand Hypolite Louis Fizeau (France), used a rotating toothed wheel to break up a light beam into a series of pulses. Fizeau made the first non-astronomical determination of the speed of light (in air). He obtained a value of 313,300 km/s. |
| 1850 | J L Foucault (France), determined the speed of light in air using a rotating mirror method. Obtained a value of 298,000 km/s. In the same year, Foucault used a rotating mirror method to measure the speed of light in stationary water and found that it was less than in air. |
| 1855 | David Alter (USA), described the spectrum of hydrogen and other gases. |
| 1859 | H L Fizeau (France), performed an experiment to determine whether the velocity of light in water is affected by flow of the water. He found that it is, the change in the velocity of light being about a half the velocity of the flowing water. |
| 1860 | Robert Wilhelm Bunsen and Gustav Kirchhoff, observed the emission spectra of alkali metals in flames and also noted the presence of dark lines arising from absorption when observing the spectrum of a bright light source through the flame. The origin of these dark lines was similar to that of dark lines in the solar spectrum observed by Wollaston and Fraunhoffer and attributed to the absorption of light by gases in the solar atmosphere that are cooler than those emitting the light [Annalen der Physik und der Chemie. 110, 1860]. |
| 1865 | James Clerk Maxwell (Scotland) found by deriving equations that the speed of an electromagnetic wave is, within experimental error, the same as the speed of light. Maxwell concluded that light is a form of electromagnetic wave. |
| 1869 | John Tyndall (Ireland), described experimental studies of the scattering of light from aerosols [Phil. Mag. 37, 384; 38 , 156, 1869]. |
| 1871 | John William Strutt, third Baron Rayleigh, presented a general law which related the intensity of light scattered from small particles to the wavelength of the light when the dimensions of the particles are much less than the wavelength. He also made a 'zone plate' which produced focusing of light by Fresnel diffraction. [Phil. Mag. 41, 107,274,447, 1871]. |
| 1873 | Ernst Abbe (Germany), presented a detailed theory of image formation in the microscope. |
| 1874 | Marie Alfred Cornu (France), described a graphical approach (the Cornu spiral) to the solution of diffraction problems. |
| 1875 | John Kerr (Scotland), demonstrated the quadratic electro-optic effect (the Kerr effect) in glass. |
| 1879 | Josef Stefan (Austria). Presented an empirical relationship which asserted that the total radiant energy emitted from a body per unit time is proportional to the fourth power of the absolute temperature of the body. |
| 1879 | Joseph Swan (England), demonstrated an electric lamp with a carbon filament. |
| 1879 | Thomas Edison (USA), developed the electric lamp using cotton as the source of the carbon filament and produced it as a practical device. |
| 1882 | Albert Abraham Michelson (USA, b. Poland), described the Michelson interferometer. |
| 1885 | Johann Jakob Balmer (Switzerland), presented an empirical formula describing the position of the emission lines in the visible part of the spectrum of hydrogen. |
| 1887 | Albert A Michelson and Edward W Morley (USA), described unsuccessful attemps to detect the motion of the Earth with respect to the 'Luminiferous Aether' by investigating whether the speed of light depends upon the direction in which the light beam moves (The famous Michelson-Morley experiment, which was eventually to force physicists to abandon the idea of the existence of the Aether). |
| 1887 | Heinrich Hertz (Germany), accidentally discovered the photoelectric effect. |
| 1890 | Wiener observed standing waves in light reflected at normal incidence from a silver mirror. Nodes and antinodes in the standing wave were detected photographically and it was concluded that a node exists at the mirror surface. From this it is concluded that, at least as far as photographic effects are concerned, the electric component of the electromagnetic wave has the more important effect. |
| 1891/92 | L Mach and L Zehnder separately described what has become known as the Mach-Zehnder interferometer which could monitor changes in refractive index, and hence density, in compressible gas flows. The instrument has subsequently been applied in the field of aerodynamics. |
| 1895 | D J Korteweg and G deVries (Netherlands) derived a non-linear partial differential equation governing the propagation of waves in shallow water that described the solitary wave described by John Scott Russell. Study of the Korteweg-deVries (KdV) equation has had an important role in the development of the mathematical description of solitons. |
| 1896 | Wilhelm Wien (Germany), described how the spectral distribution of radiation from a black body varies with the temperature of the body. [Annalen der Physik 38, 662, 1896] |
| 1896 | Pieter Zeeman (Netherlands), observed that the spectral lines emitted by an atomic source are broadened when the source is placed in a magnetic field. |
| 1899 | Lord Rayleigh (England), explained the blue color of the sky and red sunsets as being due to the preferential scattering of blue light by molecules in the Earth's atmosphere. [Phil. Mag. 47 , 375, 1899]. |
| 1899 | Marie P A C Fabry and Jean B G G A Perot (France), described the Fabry-Perot interferometer which enabled high resolution observation of spectral features. [C Fabry and A Perot. Ann.Chim.Phys. 16, p115, 1899]. |
| 1900 | Max Karl Planck (Germany), explained the spectrum of radiation emitted from a hot black body by introducing a universal constant described as the quantum of action, now known as Planck's constant. A consequence is that the energy of an oscillator is the sum of small discrete units, each of which has a value that is proportional to the frequency of oscillation. |
| 1905 | Albert Einstein (Germany), explained the photoelectric effect on the basis that light is quantized, the quanta subsequently becoming known as photons. [Annalen der Physik 17, p132, 1905]. [Annalen der Physik 20, p199, 1906]. |
| 1908 | Gustav Mie (Germany), presented a description of light scattering from particles that are not small compared to the wavelength of light, taking account of particle shape and the difference in refractive index between the particles and the supporting medium. |
| 1913 | Neils Henrik David Bohr (Denmark), advanced a theory of the atom in which the electrons were presumed to occupy stable orbits with well-defined energy. According to this theory, the absorption and emission of light by an atom occurs as a result of an electron moving from one orbit to another of different energy. This allowed an explanation of the observation that atoms absorb and emit light at particular frequencies that are characteristic of the atom. |
| 1915 | William David Coolidge (USA), patented a method of making electric lamp filaments from tungsten. |
| 1916 | Albert Einstein (Germany), proposed that the stimulated emission of light is a process that should occur in addition to absorption and spontaneous emission. |
| 1919 | Sir Arthur Eddington (England). observed the eclipse of the Sun on 29th May from Principe Island off the west coast of Africa with the intention of determining the apparent position of stars that appeared close to the Sun's disk. He concluded that the path of light is bent by the Sun's gravitational field in accordance with predictions of Einstein's theory of General Relativity. |
| 1926 | A A Michelson (USA), performed a series of experiments to determine the speed of light using a rotating mirror method with a light path from the observatory at Mount Wilson to a reflector on Mount San Antonio, a distance of 22 miles (35 km). Obtained an average value of 299,796 km.s-1 |
| 1927 | Paul Adrien Maurice Dirac (England), presented a method of representing the electromagnetic radiation field in quantized form. [Proceedings of the Royal Society A, 114, 243, 710, 1927]. |
| 1928 | Chandrasekhara Raman (India), observed weak inelastic scattering of light from liquids, an effect arising from the scattering of light by vibrating molecules and now known as Raman scattering. [Indian J. Phys. 2 ,p387, 1928]. |
| 1932 | P Debye and F W Sears and also R Lucas and P Biquard independently observed the diffraction of light by ultrasonic waves. |
| 1932 | E H Land (USA). Invented "polaroid" polarizing film |
| 1934 | Frits Zernicke (Netherlands), described the phase-contrast microscope. |
| 1939 | Walter Geffcken (Germany), described the transmission interference filter. |
| 1941 | W C Anderson measured the speed of light using a Kerr cell to modulate a light beam that passed through a Michelson interferometer. Obtained a value of 299,776 km/s. |
| 1948 | Dennis Gabor ( b.Hungary), described the principles of wavefront reconstruction, later to become known as holography. |
| 1954 | C H Townes, J P Gordon and H J Zieger (USA), in a paper entitled "Molecular microwave oscillator and new hyperfine structures in the microwave spectrum of NH3", they described a maser built at Columbia University which used ammonia to produce coherent microwave radiation. [Physical Review. 95, p 282, 1954] |
| 1958 | Arthur L Schawlow and Charles H Townes (USA), published a paper entitled "Infrared and Optical Masers" in which it was proposed that the maser principle could be extended to the visible region of the spectrum to give rise to what later became known as a 'laser'. [Physical Review. 112(6), p1940, 1958]. |
| 1960 | Theodore H Maiman (USA), described the first laser. The laser was built at the Hughes Research Laboratories and used a rod of synthetic ruby as the lasing medium. [Nature. 187, p493, 1960]. |
| 1961 | P A Franken, A E Hill, C W Peters and G Weinreich demonstrated harmonic generation from light by passing the pulse from a ruby laser through a quartz crystal. |
| 1961 | Ali Javan, W R Bennett and Donald R Harriott (USA) described the first gas laser. Built at the Bell Laboratories, the lasing medium was a mixture of helium and neon and emitted at wavelengths in the near infrared, the most intense beam being at a wavelength of 1.153 mm. ["Population inversion and continuous maser oscillation in a gas discharge containing He-Ne mixtures", Physical Review Letters, 6, p106, 1961]. |
| 1962 |
Four groups in the United States described the observation of stimulated emission from homojunction gallium arsenide semiconductor diodes. [M I Nathan et al, (IBM). Applied Physics Letters.
1, p62, 1962] |
| 1963 | Kumar Patel (USA, b India), announced the development of the first carbon dioxide laser at Bell Laboratories. |
| 1964 | William B Bridges (USA), built the first ion lasers at Hughes Research Laboratories. ["Visible and UV laser oscillation at 118 wavelengths in ionized neon, argon, krypton, oxygen and other gases". W B Bridges and Arthur N Chester, Applied Optics, 4, p573, 1965] |
| 1964 | Jerome V V Kasper and George C Pimentel (USA), described the photodissociation Iodine laser, built at the University of California, Berkeley, in which a population inversion in atomic iodine was produced by the photodissociation of either CF3I or CH3I. The laser output was in the near infrared at a wavelength of 1.315 mm. [Applied Physics Letters. 5(11), p231, 1964] |
| 1966 | Sorokin and J R Lankard built the first organic dye laser. |
| 1967/69 | S L McCall and E L Hahn (USA), described studies of the propagation of very short optical pulses through a medium consisting of resonant two level atoms, developing in the process the criteria to be satsified by the shape of the pulse so that it would propagate as an optical soliton (the area theorem) and describing the propagation mechanism of self-induced transparency (SIT). [Physical Review Letters, 18, p908, 1967] [Physical Review, 183, p457, 1969]. |
| 1971 | John M J Madey (USA), published a paper entitled "Stimulated emission of bremsstrahlung in a periodic magnetic field". Madey outlined the principles of the free electron laser. [Journal of Applied Physics, 42, p1906, 1971]. |
| 1976 | John M J Madey (USA), and a group at Stanford University demonstrated the first free electron laser (FEL). |
| 1985 | D L Matthews et. al. (USA), described x-ray laser experiments at the Lawrence Livermore National Laboratory in which amplified spontaneous emission was observed at wavelengths around 20 nm. ["Demonstration of a soft x-ray amplifier", Physical Review Letters. 54, p110, 1985]. |
| 1990 | The Hubble space telescope was positioned in a low Earth orbit on 25th April, 1990. |
| 1995 | Shuji Nakamura (Japan) perfected a blue laser diode using gallium nitride as the semiconductor. |
| ~ 2000 | High intensity white LED's containing a blue light emitting doide and a white phosphor became available. Edison/Swan filament type bulbs (1879) will one day soon be replaced by efficient 50 year LED lights. |
The information is a slightly edited version of a web document. The interested reader may try ...
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