Wavelength-dependent Emission Research Articles

Photoionization parameters in the carbon dioxide laser gases

The data and results of an extended investigation of the more salient parameters associated with the application of ultraviolet (UV) photoionization processes in TEA CO 2 lasers are presented. The study encompasses emission spectra, wavelength dependence, and influence of circuit parameters for a typical UV spark source. This investigation and a companion study utilizing a specialized charge collection apparatus on a monochromator provides further insight into the primary mechanisms involved in these photoinitiated laser devices and has, in addition, provided design criteria for the development of more efficient photoionization sources.

Wavelength dependence of skin emissivity

Determination of skin emissivity, particularly in the wavelength range2 to 20 µ, is important for the interpretation of the scans obtained in clinical infra-redthermography. This emissivity can be inferred from the difference in apparenttemperature for an area of skin and a black-body set to have the same true surfacetemperature. The approximations inherent in the previous use of the Dreyfus rulein this connection for calculation of emissivity over a range of wavelengths arediscussed in detail.