Apparatus for measuring spectral power of a light beam

Details Apparatus for measuring spectral power of a light beam Apparatus for measuring spectral power of a light beam

1987-01-27

1988-07-19

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356328, G01J 330

Patent

active

047580860

ABSTRACT:
In an optical measuring apparatus, a laser beam is transferred to a diffraction grating so that the laser beam is spectrally separated into respective wavelength components. The wavelength components are sequentially guided into a polarizing optical element in which the respective wavelength component are separated into S and P polarized components, when the diffraction grating is rotated. The S and P polarized components of the respective wavelengths are detected by photodetectors and electrical signals from the photodetectors are supplied to a signal processing unit. In the signal processing unit, the electrical signals corresponding to the P and S components are corrected with a spectral efficiency characteristic of the grating, a percent loss characteristic of the polarizing element and photoelectro conversion characteristics of the photodetectors and the corrected signals are analyzed to obtain an absolute value of the laser energy for the respective wavelength.

REFERENCES:
Moore, SPIE, vol. 234, New Developments and Applications in Optical Radiation Measurements (Sira), 1980, pp. 86-90.

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