Abstract
The hollow cathode He-Cd+ white-light laser simultaneously oscillates at three primary colors of light (red, green, and blue) in the visual range. The red output has wavelengths of 636.0 nm and 635.5 nm; the green output has wavelengths of 537.8 nm and 533.7 nm; and the blue output has a wavelength of 441.6 nm. The authors measured the small signal gains of these five wavelengths using an amplifier method. The three color outputs radiated from the oscillator tube were directed into an amplifier tube in order to measure the dependence of the gain coefficient on the anode current and the He pressure for each wavelength.
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