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Photoacoustic and Photothermal Spectroscopy: Principles and Applications introduces the basic principles, instrumentation and major developments in the many applications of Photoacoustic and Photothermal Spectroscopy over the last three decades. The book explains the processes of sound generation by periodic optical excitation and ultrasonic generation by pulsed laser excitation and describes the workings of photoacoustic cells equipped with microphones and piezoelectric transducers. Photoacoustic imaging (PAI) is one of the fastest-growing imaging modalities of recent times. It combines the advantages of ultrasound and optical imaging techniques.

Optoacoustic spectroscopy. --- Photothermal spectroscopy. --- Optothermal spectroscopy --- Photothermal optical diagnostics --- Laser spectroscopy --- PAS (Spectroscopy) --- Photoacoustic spectroscopy --- Photoacoustic Techniques --- Spectrum Analysis --- Ultrasonography --- Optical Imaging

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Optical gas sensing is one of the fastest developing research areas in laser spectroscopy. Continuous development of new coherent light sources operating especially in the Mid-IR spectral band (QCL—Quantum Cascade Lasers, ICL—Interband Cascade Lasers, OPO—Optical Parametric Oscillator, DFG—Difference Frequency Generation, optical frequency combs, etc.) stimulates new, sophisticated methods and technological solutions in this area. The development of clever techniques in gas detection based on new mechanisms of sensing (photoacoustic, photothermal, dispersion, etc.) supported by advanced applied electronics and huge progress in signal processing allows us to introduce more sensitive, broader-band and miniaturized optical sensors. Additionally, the substantial development of fast and sensitive photodetectors in MIR and FIR is of great support to progress in gas sensing. Recent material and technological progress in the development of hollow-core optical fibers allowing low-loss transmission of light in both Near- and Mid-IR has opened a new route for obtaining the low-volume, long optical paths that are so strongly required in laser-based gas sensors, leading to the development of a novel branch of laser-based gas detectors. This Special Issue summarizes the most recent progress in the development of optical sensors utilizing novel materials and laser-based gas sensing techniques.

laser flow meter --- Pitot tube --- flow speed --- time of flight --- dilution method --- flow simulation --- flow turbulence --- gas sensing applications --- MEMS --- gas sensor --- photoacoustics --- cantilever --- capacitive detection --- analytic model --- infrared imaging --- multispectral and hyperspectral imaging --- air pollution monitoring --- remote sensing and sensors --- spectroscopy --- fourier transform --- image processing --- laser gas analyzer --- flux measurement --- eddy covariance method --- derivative absorption spectroscopy --- gas sensors --- antiresonant hollow core fibers --- laser spectroscopy --- wavelength modulation spectroscopy --- tunable diode laser absorption spectroscopy --- photothermal spectroscopy --- photoacoustic spectroscopy --- fiber gas sensors --- mid-infrared --- quantum cascade detector --- high-speed operation --- heterodyne detection --- high-resolution spectroscopy --- isotopic ratio --- frequency comb --- Vernier spectroscopy --- refractometry --- pressure --- short-term performance --- Fabry–Perot cavity --- gas modulation --- modulation techniques --- metrology --- integrated sensors --- waveguides --- absorption spectroscopy --- Raman spectroscopy --- gas sensing --- femtosecond laser micromachining --- microchannel fabrication --- microstructured fibers --- photoacoustic --- pressure transducer --- wafer-level --- CO2 --- combined NIR/MIR laser absorption --- laser multiplexing in a mid-IR single-mode fiber --- simultaneous multispecies (CO, CO2, H2O) in situ measurements

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Novel Specialty Optical Fibers and Applications focuses on the latest developments in specialty fiber technology and its applications. The aim of this reprint is to provide an overview of specialty optical fibers in terms of their technological developments and applications. Contributions include:1. Specialty fibers composed of special materials for new functionalities and applications in new spectral windows.2. Hollow-core fiber-based applications.3. Functionalized fibers.4. Structurally engineered fibers.5. Specialty fibers for distributed fiber sensors.6. Specialty fibers for communications.

Technology: general issues --- History of engineering & technology --- optical amplifiers --- doped fiber amplifiers --- near-infrared --- molecular gas spectroscopy --- photothermal spectroscopy --- heterodyne detection --- specialty fiber --- anti-resonant effect --- hollow structure --- sensing applications --- orbital angular momentum --- optical fiber --- fiber mode crosstalk --- vortex mode generator --- fiber optics --- plasmonic gratings --- nanodot --- light collection --- hollow-core fibers --- anti-resonant hollow-core fibers --- tapered fibers --- fiber gas lasers --- fiber end cap --- SiO2-Au-TiO2 heterostructure --- long-range surface plasmon resonance --- microstructured optical fiber --- fiber sensor --- photonic crystal fibers --- fiber lasers --- stimulated Raman scattering --- gas Raman lasers --- specialty fibers --- Brillouin optical time domain analysis --- BOTDA --- distributed fiber sensor --- photonic crystal fiber --- strain and temperature sensing --- liquid crystal --- dual-core photonic crystal fiber --- polarization beam splitter --- extinction ratio --- polarization filter --- surface plasmon resonance --- gold-coated --- crosstalk --- mid-infrared (mid-IR) --- chalcogenide glasses (ChGs) --- optical microfibers (MFs) --- supercontinuum (SC) --- molecular sensing --- Raman spectroscopy --- capillary-based hollow core fibers --- hollow core photonic crystal fiber --- detection --- distributed acoustic sensing --- DAS --- scattering enhancement fiber --- fiber-optic sensors --- few-mode fiber --- microfiber --- Mach-Zehnder interferometer --- critical wavelength --- multicore fiber --- fiber Bragg grating --- long period grating --- fiber grating sensors --- optical amplifiers --- doped fiber amplifiers --- near-infrared --- molecular gas spectroscopy --- photothermal spectroscopy --- heterodyne detection --- specialty fiber --- anti-resonant effect --- hollow structure --- sensing applications --- orbital angular momentum --- optical fiber --- fiber mode crosstalk --- vortex mode generator --- fiber optics --- plasmonic gratings --- nanodot --- light collection --- hollow-core fibers --- anti-resonant hollow-core fibers --- tapered fibers --- fiber gas lasers --- fiber end cap --- SiO2-Au-TiO2 heterostructure --- long-range surface plasmon resonance --- microstructured optical fiber --- fiber sensor --- photonic crystal fibers --- fiber lasers --- stimulated Raman scattering --- gas Raman lasers --- specialty fibers --- Brillouin optical time domain analysis --- BOTDA --- distributed fiber sensor --- photonic crystal fiber --- strain and temperature sensing --- liquid crystal --- dual-core photonic crystal fiber --- polarization beam splitter --- extinction ratio --- polarization filter --- surface plasmon resonance --- gold-coated --- crosstalk --- mid-infrared (mid-IR) --- chalcogenide glasses (ChGs) --- optical microfibers (MFs) --- supercontinuum (SC) --- molecular sensing --- Raman spectroscopy --- capillary-based hollow core fibers --- hollow core photonic crystal fiber --- detection --- distributed acoustic sensing --- DAS --- scattering enhancement fiber --- fiber-optic sensors --- few-mode fiber --- microfiber --- Mach-Zehnder interferometer --- critical wavelength --- multicore fiber --- fiber Bragg grating --- long period grating --- fiber grating sensors

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Novel Specialty Optical Fibers and Applications focuses on the latest developments in specialty fiber technology and its applications. The aim of this reprint is to provide an overview of specialty optical fibers in terms of their technological developments and applications. Contributions include:1. Specialty fibers composed of special materials for new functionalities and applications in new spectral windows.2. Hollow-core fiber-based applications.3. Functionalized fibers.4. Structurally engineered fibers.5. Specialty fibers for distributed fiber sensors.6. Specialty fibers for communications.

optical amplifiers --- doped fiber amplifiers --- near-infrared --- molecular gas spectroscopy --- photothermal spectroscopy --- heterodyne detection --- specialty fiber --- anti-resonant effect --- hollow structure --- sensing applications --- orbital angular momentum --- optical fiber --- fiber mode crosstalk --- vortex mode generator --- fiber optics --- plasmonic gratings --- nanodot --- light collection --- hollow-core fibers --- anti-resonant hollow-core fibers --- tapered fibers --- fiber gas lasers --- fiber end cap --- SiO2-Au-TiO2 heterostructure --- long-range surface plasmon resonance --- microstructured optical fiber --- fiber sensor --- photonic crystal fibers --- fiber lasers --- stimulated Raman scattering --- gas Raman lasers --- specialty fibers --- Brillouin optical time domain analysis --- BOTDA --- distributed fiber sensor --- photonic crystal fiber --- strain and temperature sensing --- liquid crystal --- dual-core photonic crystal fiber --- polarization beam splitter --- extinction ratio --- polarization filter --- surface plasmon resonance --- gold-coated --- crosstalk --- mid-infrared (mid-IR) --- chalcogenide glasses (ChGs) --- optical microfibers (MFs) --- supercontinuum (SC) --- molecular sensing --- Raman spectroscopy --- capillary-based hollow core fibers --- hollow core photonic crystal fiber --- detection --- distributed acoustic sensing --- DAS --- scattering enhancement fiber --- fiber-optic sensors --- few-mode fiber --- microfiber --- Mach–Zehnder interferometer --- critical wavelength --- multicore fiber --- fiber Bragg grating --- long period grating --- fiber grating sensors --- n/a --- Mach-Zehnder interferometer