Fast, broadband, rugged spectrometer for near-infrared measurements of organic solutions and multicomponent mixtures.

The mode of operation and theoretical concept behind a type of near-infrared spectrometer is discussed, which is used to measure concentrations of glucose, ethanol, CaCl2, and KCl solutions in water, respectively. The main features of the instrument are its potential for short time-to-measurement resolution on the order of tens of milliseconds, its broad spectral bandwidth from 1.0 to 2.

Raman amplification and lasing in SiGe waveguides.

We describe the first observation of spontaneous Raman emission, stimulated amplification, and lasing in a SiGe waveguide. A pulsed optical gain of 16dB and a lasing threshold of 25 W peak pulse power (20 mW average) is observed for a Si1-xGex waveguide with x=7.5%.

Influence of nonlinear absorption on Raman amplification in Silicon waveguides.

We model the TPA-induced free carrier absorption effect in silicon Raman amplifiers and quantify the conditions under which net gain may be obtained. The achievable Raman gain strongly depends on the free carrier lifetime, propagation loss, and on the effective Raman gain coefficient, through pump-induced broadening.

Observation of Raman emission in silicon waveguides at 1.54 microm.

We report the first measurements of spontaneous Raman scattering from silicon waveguides. Using a 1.43 m pump, both forward and backward scattering were measured at 1.