Wavelength range, optimum

The spectrometer in Problem 4.1 shall be used in first order for a wavelength range around 500 nm. What is the optimum blaze angle, if the geometry of the spectrometer allows an angle of incidence a about 20° ... 

Several coumarin-containing methacrylate (8) side-chain polymers have been prepared [106]. The optimum poling temperatures for these side-chain polymers were well above the Tg, a characteristic that is attributed to the absence of flexible spacers between the polymer chain and the bulky cou-marin chromophore. A stable of 13 pm V at 1.064 jxm was obtained at room temperature. A strong dispersion of r.vi, ranging from 2 to 12 pm V in the wavelength range 477 to 1115 nm, was observed in the electrode-poled polymers. 

The detection of spectral sensitizing action often depends on amplification methods such as photographic or electrophotographic development or, alternatively, on chemical or biochemical detection of reaction products. Separation of the photosensitization reaction from the detection step or the chemical reaction allows selection of the most effective spectral sensitizers. Prime considerations for spectral sensitizing dyes include the range of wavelengths needed for sensitization and the absolute efficiency of the spectrally sensitized process. Because both sensitization wavelength and efficiency are important, optimum sensitizers vary considerably in their stmctures and properties. 

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