Imaging the brains of birds with picosecond optical tomography gives scientists a fascinating look into how these animals respond to calls and songs—and insight into how the technology could be applied to humans.
OSA fellow and U.S. Army Colonel Barry Shoop describes his recent experience helping to establish the National Military Academy of Afghanistan, which is designed to build expertise in engineering and train officers to support and defend the country's new constitution.
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Daniel Dawes, "Lasers and the Fine Art of Art Conservation," Optics & Photonics News 15(9), 16-19 (2004) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
Periodic structures, such as those found in photonic crystals, can generate iridescent colors. They allow some objects in nature, including opals, to display gleaming colors, even in the absence of pigment. Electromagnetic theory allows the phenomenon to be investigated through modeling.
Galileo's use of mathematics to predict experimental results is considered a cornerstone of modern science. He made significant contributions to the physical sciences, and his defense of the Copernican system brought him into conflict with the Catholic Church, which found him guilty of heresy, banned his works in 1633 and placed him under house arrest.
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text BRIAN S. BAIGRIE, "Bioelectricity and the Origins of Physiology," Optics & Photonics News 12(10), 42-45 (2001) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Peter J. Delfyett and Robert E. Nahory, "Educational Outreach: A Practical Approach," Optics & Photonics News 9(9), 47-51 (1998) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
Get PDF Email Share Share with Facebook Share on X Post on reddit Share with LinkedIn Add to Mendeley Add to BibSonomy Share with WeChat Get Citation Copy Citation Text G. R. Jacobovitz-Veselka, R. P. Espindola, C. Headley, A. J. Stentz, S. Kosinski, D. Inniss, D. Tipton, D. J. DiGiovanni, M. Andrejco, J. DeMarco, C. Soccolich, S. Cabot, N. Conti, J. J. Veselka, L. Gruner-Nielsen, T. Strasser, R. Pedrazzani, A. Hale, K. S. Kranz, R. G. Huff, G. Nykolak, P. Hansen, D. Boggavarapu, X. He, D. Caffey, S. Gupta, S. Srinivasan, R. Pleak, K. McEven, and R. Patel, "A 5.5-W Single-Stage Single-Pumped Erbium Doped Fiber Amplifier at 1550 nm," in Optical Amplifiers and Their Applications, M. Zervas, A. Willner, and S. Sasaki, eds., Vol. 16 of OSA Trends in Optics and Photonics Series (Optica Publishing Group, 1997), paper FAW21. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
The evolution of the space-charge field under illumination with weak very short pulses is discussed. Under a weak irradiation limit the space-charge field after recombination of the carrier becomes the same regardless of whether it is a cw, a single-pulsed, or a repetitive-pulsed excitation. On irradiation with very short pulses the space-charge field tends to increase and then decrease when the space-charge field is large owing to the nonlinear effect of the recombination term in the rate equation. With this fluctuation being neglected, the evolution of the space-charge field by mode-locked pulses becomes identical to that by cw illumination having the same averaged intensity, which was confirmed experimentally with a BaTiO3 crystal and II cw and a picosecond mode-locked Nd:YAG laser. (C) 1997 Optical Society of America.
We report 2-3 dB changes in the gain spectra of EDFAs in response to nanometer changes in pump wavelength within the 980 nm pump band. The pump wavelength induced gain changes are characterized and several techniques are presented to use them to improve the gain flatness of EDFAs.
We present recent results obtained in the design and construction of diode-bar pumped planar waveguide lasers. The Au coating of a Nd:Ga:Lu:Y3Al5O12 on Y3Al5O12 planar waveguide to produce a TE polarised laser with improved beam quality in the guided direction is also reported.
