Photometry Radiometry and Measurements of Optical Losses Introduction Chapter 1 Radiometric and Photometric Quantities and Notions Chapter 2 Methods of Photometric and Radiometric Measurements Chapter 3 Radiometry of Partially Coherent Radiation Chapter 4 Photometers and Radiometers Chapter 5 Conventional Loss Measurement Techniques Chapter 6 Systems of Multiple Reflections Chapter 7 Laser Spectroscopy Chapter 8 Measurements in Passive Resonators Chapter 9 Determination of Absorption Losses Chapter 10 Direct Attenuation Measurements Chapter 11 Propagation Losses in Fibers and Waveguides Chapter 12 Spectroscopic interferometry and laser excitation spectroscopy The revised 2nd edition of this practical book provides an expanded treatment and comparison of techniques used in advanced optical measurements guiding its reader from fundamental radiometric and photometric concepts to the state of the art in highly sensitive measurements of optical losses and in spectroscopic detection using coherent laser light and spontaneous radiation. The book describes and compares a broad array of high sensitivity methods and techniques from interferometric and or calorimetric acousto optic and resonator or polarization to wavelength and frequency modulation phase shift and decay time studies and direct loss measurements for free space fiber or waveguide based systems and devices. Updated throughout the new edition describes novel trends in spectral interferometry frequency comb and laser excitation spectroscopy reflected in the developments of Raman Brillouin and FTIR (Fourier Transform Infra Red) techniques for biomedical research biotech sensing and detection. It also covers broad practical implementations of time and frequency domain terahertz spectroscopy measurements. This book reviews the physical concepts of radiation transfer providing a quantitative foundation for the means of measurements of optical losses which affect propagation and distribution of light waves in various media and in diverse optical systems and components. It focuses on the application of optical methods and procedures for the evaluation of transparent reflecting scattering absorbing and aggregated objects and for determining the power and energy parameters of radiation and color properties of light. This updated new edition will serve as an up to date reference source and practical guide for those using photometric and radiometric techniques