Bøker av P. S. Ramanujam

On 16 April 1620, Raghunatha Nayak of Tanjore invited Danes to settle down and establish trade in Tharangampadi – known also as Tranquebar. Over the next 225 years, several hundred Danes made Tranquebar their home, and over a thousand found their resting place here. During this period, printing was established by German missionaries, a Protestant mission was founded, science and arts flourished, an astronomical observatory was set up and an exploration of the Nicobar Islands took place. The town had to be rescued several times from impending wars. This book shows glimpses of this exciting period from the remains left by the Danes. Arranged as a walking tour of the town, we pass by places where significant people lived and noteworthy events took place.P. S. Ramanujam, Professor Emeritus in Optics at the Technical University of Denmark, was born in Tamilnadu, India, and has lived in Denmark for more than 40 years. Besides a significant number of scientific articles in peer-reviewed journals, he has also written several articles on Tranquebar and is coauthor of Videnskab, oplysning og historie i Dansk Ostindien (2020), a book on the Norwegian astronomer, scientist, historian, philosopher, and reformer in Tranquebar Henning Munch Engelhart.

Current research into holography is concerned with applications in optically storing, retrieving, and processing information. Polarization holography has many unique properties compared to conventional holography. It gives results in high efficiency, achromaticity, and special polarization properties. This books reviews the research carried out in this field over the last 15 years. The authors provide basic concepts in polarization and the propagation of light through anisotropic materials, before presenting a sound theoretical basis for polarization holography. The fabrication and characterization of azobenzene based materials, which remain the most efficient for the purpose, is described in detail. This is followed by a description of other materials that are used in polarization holography. An in-depth description of various applications, including display holography and optical storage, is given, and the book concludes with perspectives for the future. This book is an important reference for researchers.