A type of Tm-doped silica fiber laser with narrow-linewidth and output wavelength near 1750 nm was firstly presented, by using a 1550 nm Er-doped fiber laser pump source and a volume Bragg grating (VBG). By means of a 15 cm Tm-doped fiber, a 400 mW continuous wave (cw) at ~1750 nm with FWHW of ~54 pm was generated, corresponding to an average slope efficiency up to 23.5% with respect to absorbe...

The author presents a review of some experimental works devoted to the research of evolution of large-scale perturbations and turbulent mixing (TM) in liquid and gaseous media during the growth of hydrodynamic instabilities. In particular, it is shown that growth of perturbations and TM in gases is sensitive to the Mach number of shock wave; character of gas front penetration into liquid is not...

A simple approach to acquire wide-band/angle blazing operation in 1-D metallic gratings is investigated by means of mode-matching and equivalent circuit analysis. The are single-groove perfectly conducting that support two propagating guided modes (opposed typical single-mode cases). It shown under what conditions one can achieve over a wide range frequencies angles. Most importantly, it identi...

The mammalian cochlea is a remarkable sensor that can detect motions smaller than the diameter of a hydrogen atom and can perform high-quality spectral analysis to discriminate as many as 30 frequencies in the interval of a single semitone (Kossl and Russell, 1995; Dallos, 1996). These extraordinary properties of the hearing organ depend on traveling waves of motion that propagate along the bas...

We report a measurement of the large optical transmission matrix (TM) of a complex turbid medium. The TM is acquired using polarization-sensitive, full-field interferometric microscopy equipped with a rotating galvanometer mirror. It is represented with respect to input and output bases of optical modes, which correspond to plane wave components of the respective illumination and transmitted wa...

The population trapping effect of the F34 level is an important factor limiting power scaling 2.3 μm thulium (Tm) laser on H34→H35 transition. In this Letter, we demonstrate a novel scheme ground state absorption (GSA) (H36→H34) and excited (ESA) (F34→H34) dual-wavelength pumped Tm lasers. Introducing ESA pumping process can accurately excite Tm3+ ions accumulated in to H34 level, constructing ...

Power combining of TM surface waves by a planar active-lens amplifier is the subject of this paper. An amplifier gain of 11 dB at 8.25 GHz with a 3-dB bandwidth of 0.65 GHz has been demonstrated. Gain is measured from input to output connector to facilitate comparisons with more conventional amplifiers. Measurements of output power versus input power are also presented. The amplifier behaved in...