Measurement Of Optical Absorption Coefficient Research Articles

Nanosecond laser measurements of optical absorption coefficients of electrons in polar fluids

Direct measurements of the optical absorption coefficients of the short-lived electrons in polar fluids have been made. Laser-induced photoionization of pyrene in alcohols at 293 K generated equal numbers of electrons (e s −) and pyrene positive ions (P +). The ϵ max(e s −) were derived by measuring the relative absorption intensities of e s − and P +, which had been independently characterised. The ϵ max values for e s − in methanol to 1-decanol fell within the range (1.0–2.0) × 10 4 M −1 cm −1, the implications of which are discussed.

High quality Ba 2NaNb 5O 15 characterization and optical absorption coefficient measurements

Significant improvements have been made in the quality of barium sodium niobate crystals and material with very high optical quality and low optical loss has been produced. Comparisons with previously available material can be made by means of schlieren photography and parallel light interference methods. A technique for determining absorption coefficients by differential temperature measurements has been developed and optical absorption coefficients as low as 0.0003 cm -1 at 1.06 μm have been measured.