Colorimetry is concerned with the measurement of, and discrimination between, colours. These are important topics in a wide range of the physical sciences, life sciences, and computing and engineering. Examples of specific areas where the techniques of colorimetry are used are: manufacturers of paints, textiles, plastics and cosmetics (and quality controllers in these industries), those interested in the effect of light in human environments (for example, in terms of its direct effects on the eye, laser safety and design of eye protection and ergonomics of hospital lighting), psychology, physiology and those involved in the technical aspects of photography. The book presents the physiological background behind how colour is perceived and discusses sources of visible radiation, before going on to describe in detail colorimetric techniques for measuring and discriminating between colours. Applications of these techniques are discussed and relevant mathematical data is provided. The book gives a comprehensive account of the physiological aspects of colour, the development of photometry and colorimetry, and applications of colorimetry in a single volume.

This book is intended as a textbook on laser physics for advanced undergraduates and first-year graduate students in physics and engineering who need to use lasers in their labs and want to understand the physical processes involved with the laser techniques in their fields of study. This book aims to provide a coherent theoretical framework on the light-matter interaction involved with lasers in such a way that students can easily understand the essential topics related to lasers and their applications and get accustomed to the latest cutting-edge research developments. Most of all, the content of this book is concise to be covered in a semester.

The first part of this book overviews the physics of lasers and describes some of the more common types of lasers and their applications. Applications of lasers include CD/DVD players, laser printers and fiber optic communication devices. Part II of this book describes the phenomenon of Bose-Einstein condensation. The experimental techniques used to create a Bose-Einstein condensate provide an interesting and unconventional application of lasers; that is, the cooling and confinement of a dilute gas at very low temperature.

Since the initial predictions for the existence of Weyl fermions in condensed matter, many different experimental techniques have confirmed the existence of Weyl semimetals. Among these techniques, optical responses have shown a variety of effects associated with the existence of Weyl fermions. In chiral crystals, we find a new type of fermions protected by crystal symmetries — the chiral multifold fermions — that can be understood as a higher-spin generalization of Weyl fermions. This work provides a complete description of all chiral multifold fermions, studying their topological properties and the k·p models describing them. We compute the optical conductivity of all chiral multifold fermions and establish their optical selection rules. We find that the activation frequencies are different for each type of multifold fermion, thus constituting an experimental fingerprint for each type of multifold fermion. Building on the theoretical results obtained in the first part of our analysis, we study two chiral multifold semimetals: RhSi and CoSi. We analyze the experimental results with k·p and tight-binding models based on the crystal symmetries of the material. We trace back the features observed in the experimental optical conductivity to the existence of multifold fermions near the Fermi level and estimate the chemical potential and the scattering lifetime in both materials. Finally, we provide an overview of second-order optical responses and study the second-harmonic generation of RhSi. We find a sizeable second-harmonic response in the low-energy regime associated with optical transitions between topological bands. However, this regime is extremely challenging to access with the current experimental techniques. We conclude by providing an overview of the main results, highlighting potential avenues to further research on chiral multifold semimetals and the future of optical responses as experimental probes to characterize topological phases.

The aim of the book is to provide a comprehensive and unified description of high-intensity short laser pulses and their applications at the simplest level compatible with a correct physical understanding. The idea is to provide an intuitive picture of the phenomena under consideration with simple mathematical description useful for a better understanding. The book is based on the teaching experience of the graduate course of the Politecnico di Milano "HIGH INTENSITY LASERS FOR NUCLEAR AND PHYSICAL APPLICATIONS I + II" and is particularly addressed to graduate students with a background in electromagnetism; is mostly suitable for master students in Nuclear Engineering, in Engineering Physics, and in Physics and It's recommended also to students in material sciences (or similar) and to PhD students. The text organization is due to help to follow the lessons in the classroom and to be used for self-study by students.

The unique compendium presents special principles and techniques of spectroscopic measurements that are used in semiconductor manufacturing.Since industrial applications of spectroscopy are significantly different from those traditionally used in scientific laboratories, the design concepts and characteristics of industrial spectroscopic devices may vary significantly from conventional systems. These peculiarities are thus succinctly summarized in this volume for a wide audience of students, engineers, and scientific workers.Exceptionally well-illustrated with practical solutions in detail, this useful reference text will open new horizons in new research areas.

Nanospectroscopy addresses the spectroscopy of very small objects down to single molecules or atoms, or high-resolution spectroscopy performed on regions much smaller than the wavelength of light, revealing their local optical, electronic and chemical properties. This work highlights modern examples where optical nanospectroscopy is exploited in photonics, optical sensing, medicine, or state-of-the-art applications in material, chemical and biological sciences. Examples include the use of nanospectroscopy in such varied fields as quantum emitters, dyes and two-dimensional materials, on solar cells, radiation imaging detectors, biosensors and sensors for explosives, in biomolecular and cancer detection, food science, and cultural heritage studies.