High-power widely-tunable thulium-doped fiber master-oscillator power-amplifier around 2 mm
We report a high power, widely-tuneable Tm-doped fiber master-oscillator power-amplifier system generating over 100 W of linearly-polarized output with a >190 nm tuning range. The output power is limited only by the available pump power.
Semi Classical Analysis of Thulium Doped Optical Fiber Amplifier
A theoretical model simplified to three levels continuous-wave laser system which is based on density matrix model, describes the interaction process between optical fields and optical fiber materials of amplifiers. Semi-classical model gives a simple approach expression for gain which depends on some fiber parameters such as input power, number of doped atoms per unit volume, fiber length, and core radius.
Review of Literature on Probability of Detection for Magnetic Particle Nondestructive Testing
Abstract : A critical review of the available literature concerning the minimum reliably detectable defect size aNDI for magnetic particle testing (MPT) in aerospace applications is presented. Four probability of detection (POD) studies relevant to detection of fatigue cracks in aircraft components were found over the period 1968 to 2011. As the statistical methods used in these four previous studies were either outdated or otherwise deficient, the original data were reanalysed using currently accepted techniques. A meta-analysis of the results is presented, with emphasis on statistical inferences for the defect size expected to be detected with 90% POD. It is shown that the minimum reliably detectable defect size aNDI = 2.0 mm currently specified by the Royal Australian Air Force for wet fluorescent magnetic particle inspection using the continuous method is consistent with estimates of the average performance of MPT derived from the reanalysis of the literature.