Brian John Orr is an Australian scientist specializing in laser spectroscopy and optical parametric oscillators. He received his undergraduate degree from the University of Sydney and his Ph.D. from the University of Bristol, in the United Kingdom. He was a Professor of Chemistry at the University of New South Wales where his research included mainly UV-IR laser double-resonance spectroscopy using CO2 lasers and narrow-linewidth tunable UV dye lasers. In 1988 he was appointed Professor of Chemistry at Macquarie University, where his research emphasis focuses on the development of tunable optical parametric oscillators for high-resolution spectroscopic applications.
Orr has had a distinguished scholarly career. He is a Fellow of the Australian Institute of Physics, a Fellow the Royal Australian Chemical Institute, and a Fellow of the Optical Society. He is also the recipient of various awards including the Optical Society's William F. Meggers Award.
B. J. Orr, J. G. Haub, Y. He, and R. T. White, Spectroscopic applications of pulsed tunable optical parametric oscillators, in Tunable Laser Applications, 3rd Edition, F. J. Duarte, Ed. (CRC, New York, 2016) Chapter 2.
Y. He and B. J. Orr, Rapid measurement of cavity ringdown absorption spectra with a swept-frequency laser, Appl. Phys. B 79, 941-945 (2004).
A. Fix, T. Schr÷der, R. Wallenstein, J. G. Haub, M. J. Johnson, and B. J. Orr, Tunable ▀-barium borate optical parametric oscillator: operating characteristics with and without injection seeding, J. Opt. Soc. Am. B 10, 1744-1750 (1993).
B. J. Orr and J. F. Ward, Perturbation theory of the non-linear optical polarization of an isolated system, Molecular Phys. 20, 513-526 (1971).
A. D. Buckingham, B. J. Orr and J. M. Sichel, Angular Distribution and intensity in molecular photoelectron spectroscopy I. General theory for diatomic molecules, Phil. Trans. Royal Soc. London. Series A, Math. Phys. Sci. 268, 147-157 (1971).
A. D. Buckingham and B. J. Orr, Molecular hyperpolarisabilities, Q. Rev. Chem. Soc. 21, 195-212 (1969).