Hamilton's Papers on Geometrical Optics
William Rowan Hamilton's first years of mathematical research
were devoted to the study of geometrical optics. One of the
notable results of that research was Hamilton's prediction, in
1832, of the phenomenon of
conical refraction at the surfaces of biaxal crystals.
Listed below are William Rowan Hamilton's papers on Optics: the
Theory of Systems of Rays and its three supplements,
his
British Association lectures and an expository article on optics,
and
other short papers on Optics.
These papers, with the exception of
On some Quaternion Equations connected with Fresnel's wave surface,
are included in The Mathematical Papers of Sir William
Rowan Hamilton, Volume I: Geometrical Optics, edited for
the Royal Irish Academy by A. W. Conway and J. L. Synge, and
published by Cambridge University Press in 1931. That volume
also contains some previously unpublished manuscripts, and
extracts from Hamilton's notebooks; these include the first part
of On Caustics, submitted by Hamilton to the Royal
Irish Academy at the age of nineteen, but not accepted for
publication by the Academy, and Part Second of the
Theory of Systems of Rays.
The Theory of Systems of Rays and its Three Supplements
- Theory of Systems of Rays (Transactions of the Royal Irish Academy, volume 15 (1828), pp. 69-174.)
- The Theory of Systems of Rays was Hamilton's
first published mathematical paper. A summary of the objectives
of this paper, entitled
Account of a Theory of Systems of Rays,
written by Hamilton himself, is to be found in chapter VI of the
Life of Sir William Rowan Hamilton by R. P. Graves.
The Theory of Systems of Rays is concerned with
geometrical optics. Although the paper had three parts, only the
first part of the paper was printed in Hamilton's lifetime; this
dealt with the properties of systems of rays under reflection.
The paper includes a proof of the theorem that states that if
light rays are emitted from a point, or perpendicular to some
surface, and are reflected one or more times, then the final rays
of the system are perpendicular to a series of surfaces (the
`Theorem of Malus'). It also discusses in detail the caustic
curves and surfaces when light rays are reflected from flat or
curved mirrors, and concludes with a detailed discussion of the
density of the light near the caustic surfaces. A key feature of
Hamilton's approach is the use of a characteristic function,
V, with the property that, in an isotropic medium, the
light rays are perpendicular to the level surfaces of V.
This paper had been written whilst Hamilton was an undergraduate
at Trinity College, Dublin, and was presented to the Royal Irish
Academy on April 23, 1827, and ordered to be printed. (Hamilton
was still an undergraduate at the time.) He had earlier
submitted a paper, On Caustics, which was read on
December 13, 1824,
but that paper had not been accepted for publication in the form in which it was presented.
- Supplement to an Essay on the Theory of Systems of Rays (Transactions of the Royal Irish Academy, volume 16, part 1 (1830), pp. 1-61.)
- In this Supplement, Hamilton extends his theory to systems in
which the light is refracted. He begins by deriving the
`Euler-Lagrange' equations for the light rays from the `Principle
of Least Action' (which corresponds to or generalizes Fermat's
`Principle of Least Time'). He then introduces an auxiliary
function, W, for those homogeneous systems in which the
refractive index does not depend locally on position. This
auxiliary function W is a function of the direction
cosines of the final ray. Hamilton discusses the relationships
between the characteristic function V, the auxiliary
function W, and their partial derivatives of the first and
second orders, and generalizes an number of the results of the
Theory of Systems of Rays to refracted systems.
- Second Supplement to an Essay on the Theory of Systems of Rays (Transactions of the Royal Irish Academy, volume 16, part 2 (1831), pp. 93-125.)
- In the Second Supplement, Hamilton integrates the partial
differential equations satisfied by his characteristic function,
using expansions in power series and a theorem of Laplace. He
applies his results to the study of plane systems and systems of
revolution, and derives a formula due to John Herschel for the
aberration of a thin lens.
- Third Supplement to an Essay on the Theory of Systems of Rays (Transactions of the Royal Irish Academy, volume 17 (1837), pp. 1-144.)
- The Third Supplement begins with the presentation of
Hamilton's theory of the characteristic and auxiliary functions,
in its most general and refined form. (An account of the
basic theory of the characteristic function is also to be found
in the expository paper
On a General Method of expressing the Paths of Light and of the Planets by the Coefficients of a Characteristic Function.)
The characteristic function of a ray is considered as a function
of the coordinates of the initial and final coordinates of the
ray, and satisfies a partial differential equation of the first
order with respect to the final coordinates, and a corresponding
partial differential equation of the first order with respect to
the initial coordinates. (These partial differential equations
are analogous to the `Hamilton-Jacobi equation' of dynamics.)
Hamilton investigates the relations amongst the partial
differential coefficients, of the first and second orders, of the
characteristic and auxiliary functions. He investigates the
behaviour of these functions under change of coordinates. He
investigates the effect of aberration, characterising its effects
by means of certain `elements of arrangement'. He discusses the
relationship between his theory of the characteristic function
and the undulatory theory of light, and in particular applies his
theory to the study of the propagation of light in biaxal
crystals such as arragonite. He predicts that such crystals will
exhibit the phenomenon of
conical refraction at the surfaces of biaxal crystals.
British Association Lectures and an Expository Article on Optics
- On a View of Mathematical Optics (British Association Report, Oxford 1832, 2nd edition published 1835, pp. 545-547.)
- Hamilton gave a very brief outline of his approach to the
study of optics at the meeting of the British Association for the
Advancement of Science at Oxford in 1832.
- On some Results of the View of a Characteristic Function in Optics (British Association Report, Cambridge 1833, published 1834, pp. 360-370.)
- At the meeting of the British Association for the Advancement
of Science at Cambridge in 1833, Hamilton described the
fundamental principles of his approach to the study of optics via
the use of the characteristic function V. He introduces
also the auxiliary function T, and outlines the method by
which this function can be employed in the study of optical
instruments that are symmetric under rotations about some axis of
revolution. He states some theorems concerning the nature of
aberrations for such an optical instrument. Hamilton's account
concludes with a discussion of
conical refraction at the surfaces of biaxal crystals.
- On a General Method of expressing the Paths of Light and of the Planets by the Coefficients of a Characteristic Function (Dublin University Review, 1833, pp. 795-826.)
- This expository article falls into two quite distinct halves.
The first half is an account of the history of the study of
optics, and is non-mathematical in character. The second half is
an exposition of the basic principles of Hamilton's approach to
the study of optics through the use of a characteristic function.
There is no discussion of conical refraction. The article
concludes with a brief indication of how this approach to optics
can be adapted to the study of dynamical problems.
Other Short Papers on Optics
- On the Effect of Aberration in prismatic Interference (Philosophical Magazine, 3rd series, volume 2 (1833), pp. 191-194.)
- This paper concerns an experiment on the refraction of light
by a prism, conducted by Mr. Potter, and described by him in the
Philosophical Magazine. Potter had claimed that the
results of his experiment were inconsistent with the wave theory
of light. Hamilton here disputes a part of Mr. Potter's analysis
of the problem.
- On the undulatory Time of Passage of Light through a Prism (Philosophical Magazine, 3rd series, volume 2 (1833), pp. 284-287.)
- Hamilton presents in more detail the mathematical analysis he
had employed in relation to Mr. Potter's experiment.
- Note on Mr. Potter's Reply (Philosophical Magazine, 3rd series, volume 2 (1833), p. 371.)
- This is a very brief response to Mr. Potter's reply regarding
Hamilton's analysis of his experiment.
- Remarques de M. Hamilton, Directeur de l'Observatoire de Dublin, sur un Mémoire de M. Plana inséré dans le Tome VII de la Correspondance Math. (Extrait d'une Lettre) (Correspondance Mathématique et Physique, tome 8 (1834), pp. 37-40.)
- This extract from a letter, published in Quetelet's
Correspondance Mathématique et Physique
concerns a claim by Plana, of Turin, that Malus had been right in
supposing that light rays emitted from a point were in general no
longer orthogonal to a series of surfaces after two reflections.
Hamilton refutes Plana's claim, by showing how this orthogonality
can in fact deduced, both from Plana's approach to the problem,
and by his own methods.
-
- On the Focal Lengths and Aberrations of a thin Lens of Uniaxal Crystal, bounded by Surfaces which are of Revolution about its Axis (Philosophical Magazine, 3rd series, volume 19 (1841), pp. 289-294.)
- Hamilton describes some applications of his optical method,
based on research which he had undertaken a decade earlier.
- On a Mode of deducing the Equation of Fresnel's Wave (Philosophical Magazine, 3rd series, volume 19 (1841), pp. 381-383.)
- Hamilton describes a method for obtaining the equation of the
wave surface of light in biaxal crystals proposed by Fresnel,
based on a report he had prepared a decade earlier when
refereeing a paper by Mac Cullagh on the subject. In a footnote,
Hamilton notes that Fresnel himself had published a much simpler
approach, of which he had not previously been aware.
- On some Quaternion Equations connected with Fresnel's wave surface (Proceedings of the Royal Irish Academy, volume 7 (1862) pp. 122-124, 163.)
- Hamilton applies quaternion methods to derive the equation
for Fresnel's wave surface.
Links:
D.R. Wilkins
(dwilkins@maths.tcd.ie)
School of Mathematics
Trinity College, Dublin