Method and apparatus for adjusting the wavelength in an optical

Details Method and apparatus for adjusting the wavelength in an optical Method and apparatus for adjusting the wavelength in an optical

1993-01-22

1994-07-19

Lee, John D.

Coherent light generators

Particular beam control device

Optical output stabilization

372 15, 372 20, 372102, 359210, H01S 313

Patent

active

053316517

ABSTRACT:
In a method and a corresponding apparatus for adjusting the wavelength in an optical device, a wavelength selective filter element, for example a Fabry-Perot etalon, whose wavelength characteristic depends on the angle of incidence (.alpha..sub.min) of the light beam on the filter element is arranged on a shaft which can be rotated by a motor. The filter element is mounted to the shaft such that its surface normal forms an angle (.gamma..sub.o) with the axis. The shaft itself is inclined relative to the axis of the light beam passing through the filter element. When the axis is rotating, the angle of incidence of the light beam on the filter element changes, resulting in a change of the wavelength of the transmitted beam. By rotating the axis, very small changes of the angle of incidence and thus of the wavelength can be precisely adjusted. The invention can be used in an external cavity laser comprising a semiconductor laser chip, a lens and a grating. Rotation of the grating by a drive unit provides for coarse tuning of the output wavelength of the external cavity laser and rotation of the filter element provides for fine tuning.

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Okada, Masakatsu et al., "Tilted Birefringent Fabry-Perot Etalon for Tuning Dye Lasers," Applied Optics, vol. 15, No. 2, Feb. 1976, pp. 472-476.
Beenen, G. J., et al., "Accurate Wavelength Calibration Of An Etalon-Tuned Dye Laser," Applied Spectroscopy, vol. 35, No. 6, Nov./Dec. 1981, pp. 593-598.
Smith, David W., "Coherent Fiberoptic Communications," Laser Focus/Electro-Optics, vol. 21, No. 11, Nov. 1985, pp. 92-106.

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