Light source monitor with compensated tracking ratio

Details Light source monitor with compensated tracking ratio Light source monitor with compensated tracking ratio

1996-10-28

1998-04-07

Davie, James W.

Coherent light generators

Particular beam control device

Optical output stabilization

257 80, H01S 310

Patent

active

057373485

ABSTRACT:
A laser monitor is provided with a light sensitive component disposed near the laser and spaced apart from two windows that are generally parallel to each other. The two windows are located at positions which provide compensating reflective light beams whose power reflected back onto the light sensitive component combine to provide a relatively constant sum over a finite range of magnitudes of divergences of the laser beam. The nearest window to the light sensitive component reflects a light beam with a generally circular illuminated region having a smaller diameter than the diameter of the light sensitive component. The farther window reflects a light beam onto the light sensitive component with a diameter that is larger than the light sensitive component. As the numerical aperture of the laser increases, both illuminated circles increase in diameter and the increase in one reflected beam compensates the decrease in the other reflected beam so that the sum of the two powers falling on the detector is generally constant over the preselected range of numerical apertures. This provides a relatively constant tracking ratio that enables the light sensitive component to serve as a reliable monitor of the emitted power from the laser, which can be a VCSEL.

REFERENCES:
patent: 5608233 (1997-03-01), Sahara et al.
patent: 5663944 (1997-09-01), Onun

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