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Gd-doped silica and phosphosilicate fibers were pulled from preforms fabricated using the rod-in-tube technique and the solution doping technique, respectively. Ultraviolet (UV)-B luminescence from trivalent Gd at around 312 nm given by transition from first excited state to ground state were observed under deep UV excitations.
Enhancement of photoluminescence (PL) of Gd3+-doped silica glass densified by rapid thermal treatment (RTT) in the ultraviolet (UV) is investigated. The strong emission at 314 nm is assigned to the 6P7/2 to 8S7/2 transition under excitation of 6Dj, 6Ij, and 6Pj energy levels of the Gd3+. Significant decrease of the loss covering the UV band is observed.
Bismuth (Bi)-doped fiber (BDF) lasers and amplifiers have been demonstrated in different glass hosts (i.e., aluminosilicate, phosphosilicate and germanosilicate) covering the 1150–1800nm wavelength region [1-3]. Pulsed Bi-doped fiber lasers (BDFLs) are of great interest owing to their potential applications in medicine, material processing and optical fiber communications. The first Bi-doped pulsed...
Two-micron lasers are of great interest in a range of applications, from spectroscopy and free space communications, to polymer machining and laser surgery. They also provide an important stepping-stone for wavelength generation further into the mid-infrared via nonlinear frequency conversion. Holmium doped fibre laser systems offer particularly attractive properties as they allow access to the atmospheric...
We demonstrate mode-group division multiplexing over 100m graded-index ring-core fiber supporting 4 LP mode-groups with a single radial index using SLM-based mode (de)multiplexers to transmit 2×10Gbps NRZ signals without MIMO equalization.
Heart-beat detection has found many applications in military and bio-medical areas. Many of these applications focus on the use of impulse based ultra wide band (UWB) radars. This in-turn requires expensive hardware and consumes more power (for a given range) compared to stepped frequency continuous wave (SFCW) radars. However, the micro-Doppler characteristic of human body can be detected by SFCW...
The programmable radar signal processor caters for a multi-function radar performing the major functions of target surveillance and track. This paper describes a high performance multiprocessor DSP based solution for a real time radar signal processing application . A parallel DSP system that can run radar signal processing algorithms in real time, is made available whose computing power can be harnessed...
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