Download or read book Ultrafast Mid-infrared Pulse Generation in Chalcogenide Glass written by Md Imtiaz Alamgir and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The presence of vibrational and rotational transition lines in the mid-infrared (MIR) (2-10 æm) spectral range has stimulated numerous applications in the fields of spectroscopy, sensing and medicine. These emerging applications have intensified the research effort for the growth and development of novel optical light sources. Nonlinear effects in glass fibers are being extensively studied to generate ultrafast pulses at this wavelength range. Highly nonlinear silica fiber has shown record performance in the telecommunication wavelength band, however the strong material absorption of silica glass at wavelengths>2 æm limits its applicability in MIR. Recently, due to the extended MIR transmission (>12 æm wavelength) and ultra-high nonlinear gain, chalcogenide (ChG) fibers have attracted a great deal of attention and being widely investigated as an efficient solution towards this end. ChG microwires, in addition, enable engineerable chromatic dispersion, thereby allowing easy access to different nonlinear processes for pulse generation. This dissertation explores the potential of ChG microwires for generation of ultrafast pulses at MIR wavelengths. Several different all-fiber optical sources are developed as a result of the nonlinear processes implemented to reach these wavelengths. This includes the design and development of parametric oscillators and mode-locked lasers, four-wave mixing wavelength converters, Raman soliton generation systems and supercontinuum lasers. The demonstrated sources generate pulses of wide range of temporal duration and power level, while covering a wavelength range of 1.9 æm to 3.0 æm with broadband and/or selective wavelength tunability. The numerical investigation of the underlying nonlinear process are also performed to confirm and predict the experimental behavior. Owing to their compactness, hand-portability, low power consumption and broad operation window, these novel optical sources are expected find wide range of applications in MIR spectroscopy and sensing"--