Method and apparatus for calibrating a laser wavelength control

Details Method and apparatus for calibrating a laser wavelength control Method and apparatus for calibrating a laser wavelength control

1993-07-16

1995-09-12

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

With color transmitting filter

250372, 250226, 359886, 372 32, G01J 351

Patent

active

054502071

ABSTRACT:
Calibration of a wavelength adjustment mechanism of a laser is achieved using a hollow cathode absorption lamp. The lamp is provided with a vaporous material having a precisely known wavelength of maximum absorption. A photo-detector detects the amount of light from the laser beam absorbed by the vaporous material as a function of wavelength. The wavelength of the laser is adjusted to achieve maximum absorption such that the actual laser beam wavelength may be compared with an expected, wavelength to determine a calibration offset. The hollow cathode lamp is operated to produce a vaporous material of known absorption characteristic but is illuminated at a level substantially below a level required for conventional opto-galvanic resonance.

REFERENCES:
patent: 4684258 (1987-08-01), Webster
patent: 4823354 (1989-04-01), Znotins et al.
patent: 5068864 (1991-11-01), Javan

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