全波···声光···器研·
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1.Tr···it··· m···l ··· a···va··· n···-i···ar···lu···es···t ···er···s
- 关键词:
- Transition metal ion activated materials; Local chemistry engineering;Near-infrared luminescence; Bandwidth; Decay dynamics;TRANSPARENT GLASS-CERAMICS; ZINC GALLOGERMANATE NANOPARTICLES;LONG-PERSISTENT PHOSPHORESCENCE; OPTICAL-ABSORPTION SPECTRA; DOPED FIBERAMPLIFIER; PBS QUANTUM DOTS; BROAD-BAND; UP-CONVERSION;ROOM-TEMPERATURE; GROUND-STATE
Near infrared (NIR) luminescent materials are an exciting playground for telecommunications, biosciences and solar energy conversion. In particular, transition metal (TM) ions activated materials, which exhibit unique spectroscopic features such as broadband luminescence and long lasting phosphorescence in the NIR region, have attracted increasing attention. The local chemistry environment enables TM ions activated to have compelling properties such as tunable, broadband NIR emission as well as the adjustable decay dynamics. In this review, we firstly introduce the fundamental principles, the crystal field theory, for the NIR optical response of the TM ions, discuss the key physical factors to adjust the NIR luminescence properties of the TM ions. Secondly, we present a comprehensive review of the strategies based on local chemistry engineering for design the TM ions activated materials with the desired performance. Furthermore, we also emphasize recent advances in the application of the TM ions activated materials. Finally, we comment on the future requirements for the TM ions activated materials.
...2.Fo···er···ma···Mo···Lo···d ···er···d ··· A···ic···on·
- 关键词:
- swept laser; Fourier domain mode-locking; instability; frequency; timediscretization; laser and optics system;OPTICAL COHERENCE TOMOGRAPHY; WAVELENGTH-SWEPT LASER; STRAIN SENSORINTERROGATION; FIBER BRAGG GRATINGS; HIGH-SPEED; HIGH-RESOLUTION; FDMLLASERS; MU-M; TIME; SYSTEM
The sweep rate of conventional short-cavity lasers with an intracavity-swept filter is limited by the buildup time of laser signals from spontaneous emissions. The Fourier domain mode-locked (FDML) laser was proposed to overcome the limitations of buildup time by inserting a long fiber delay in the cavity to store the whole swept signal and has attracted much interest in both theoretical and experimental studies. In this review, the theoretical models to understand the dynamics of the FDML laser and the experimental techniques to realize high speed, wide sweep range, long coherence length, high output power and highly stable swept signals in FDML lasers will be discussed. We will then discuss the applications of FDML lasers in optical coherence tomography (OCT), fiber sensing, precision measurement, microwave generation and nonlinear microscopy.
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