Nonlinear optics and photonics

Nuclear Spectroscopy. Edited by C. F. Bertsch and D. Kurath. (Springer-Verlag, 1980.) [Pp. vii + 250.] Dm 33; $19.50. Scope: Workshop Proceedings. Level: For specialists only.

The p-n Reaction and the Nucleon-Nucleon Force. Edited by C. D. Goodman, S. M. Austin, S. D. Bloom, J. Rapaport and G. R. Ratchler. (Plenum Press, 1980.) [Pp. x+539.] $55.00.

Advances in Radiation Protection and Dosimetry in Medicine. Edited by R. H. Thomas and V. Perez-Mendnez. (Plenum Press, 1980.) [Pp.ix + 658.] $59.50.

Geometrical Methods of Mathematical Physics. By Bernard Schutz. (Cambridge University Press, 1980.) [Pp.xii + 250.] Hardcover £18.00; paperback £7.50. Level: second or third-year undergraduate.

Electricity and Magnetism. Third edition. By W. J. Duffin. (McGraw-Hill, 1980.) [Pp.xix + 667.] £7.50. Scope: Textbook, Library; Level: Undergraduate.

Arithmetic Applied Mathematics. By Donals Greenspan. (Pergamon Press, 1980.) [Pp. 161.] Hardcover $25.00. £11.00; Flexicover $11.25, £5.00. Level: First and second-year undergraduate.

Classical Mechanics. By Herbert Goldstein. (Addison-Wesley, 1980.) [Pp. xiv + 672.] Level: Second and third year undergraduate.

Gauge Fields, Introduction to Quantum Theory. By L. D. Faddeev and A. A. Slavnov. (Benjamin Cummings. Inc., 1980.) [Pp. xiv + 232.] $28.50.

Quantum Chromodynamics. Edited by J. L. Alonso and R. Tarrach. Lecture Notes in Physics, No. 118. (Springer-Verlag, 1980.) [pp.viii+424.] DM 47/US $27.80, Paper.

Symmetry Principles in Elementary Particle Physics. By W. M. Gibson and B. R. Pollard. (Cambridge University Press, 1980.) [Pp.xi + 386.] £9.95, paperback.

Fine Line Lithography. Edited by R. Newman. (North-Holland, 1980.) [Pp. vi+476.] $92.75; Dfl. 190.00. Scope: Survey. Level: Specialist/post-graduate.

Table of Laser Lines in Gases and Vapours. Third edition. By R. Beck, W. English and K. G$uUrs. (Springer-Verlag, 1980.) [Pp. ix + 247.] DM 62; $36.50. Scope: Survey. Library (reference). Level: For specialists only.

A Dictionary of Scientific Units. Fourth edition. By H. G. Gerrard and D. B. McNeill. (Chapman &; Hall, 1980.) [Pp. ix + 212.] Paperback £5.95; Hardback £10.00.

A Dictionary of Named Effects and Laws in Chemistry, Physics and Mathematics. Fourth Edition. By D. W. G. Ballentyne and D. R. Lovett. (Chapman and Hall, 1980.) [Pp. viii + 346.] Paperback £7.95; Hardback £15.00.     

Silicon Photonics: Fundamentals and Devices,by M. Jamal Deen and P.K.Basu

I discuss in very simple terms some recent developments concerning the intricate relationship between the spectrum of frequencies of ‘drums’ and the geometry of their rims.     

Synchronization of chaos in unidirectionally and bidirectionally coupled multiple time delay laser diodes with electro-optical feedback

We report on chaos synchronization in both unidirectionally and bidirectionally coupled multiple time delay laser diodes with electro-optical feedback. We derive existence and sufficient stability conditions for the synchronization regimes. We calculate the Lyapunov exponents, information dimension, and Kolmogorov-Sinai entropy for a single and double delay time lasers to demonstrate that multiple time delay laser system can offer higher complexity than a single time delay laser. We demonstrate that in coupled multiple time delay lasers additional feedback(s) can play a stabilizing role. We compare the synchronization quality for closed loop and open loop receiver laser configurations and find better synchronization quality for partially open loop receiver (when the receiver laser has only one feedback loop), than the open loop receiver configuration (when the receiver contains no feedback loops). We also study the effect of the feedback phase on the correlation coefficient between the interacting laser systems. Analytical results are fully supported by numerical simulations.     

Impact of modulated multiple optical feedback time delays on laser diode chaos synchronization

By studying laser diodes subject to multiple time-delayed optical feedback, we demonstrate that the signatures of time delays in the autocorrelation function of the laser output can be erased in systems incorporating modulated feedback time delays. This property enhances the suitability of such laser systems highly suitable for secure chaos-based communication systems. Chaos synchronization properties of a laser-based modulated multiple time-delayed system are also reported for the first time.     

Synthesis and Characterization of Homopolymers and Copolymers Containing closo‐[B12H12]2− Boron Cage Derivatives

Chains of cages : Neutral/ionic [B₁₂H₁₂]^2? boron‐cage‐functionalized methacrylate and styrene homopolymers or copolymers (see picture) are non‐crystalline solids, T_g increases as the number of B₁₂ cages in the chain of polystyrene increases, and homopolymers retain more weight than the copolymers when heated to 400 °C.

     

Correlation dimension signature of wideband chaos synchronization of semiconductor lasers

Chaos data analysis has been performed on the chaotic output power time series data from a synchronized transmitter-receiver pair of semiconductor lasers. The system uses an asymmetric, bidirectional coupling configuration between the master (transmitter), which is a laser diode with optical feedback, and a stand-alone slave semiconductor laser. The correlation dimension of the chaotic time series has a minimum value of 4, which was obtained from high-bandwidth measurements. The correlation dimensions for both the master and the synchronized slave are identical when the cross-correlation coefficient of the synchronized chaos is above 0.9. These results establish correlation dimension analysis as an effective tool for the determination of the quality of wideband chaos synchronization.