Beam protecting device

Details Beam protecting device Beam protecting device

1995-11-27

1999-11-23

Ben, Loha

Optical: systems and elements

Lens

With support

359822, 359205, 250568, G02B 702

Patent

active

059911026

ABSTRACT:
A beam projecting apparatus which includes a light source emitting a laser beam; and a beam projecting device which includes a beam projecting portion from which the laser beam is projected outwardly so that the laser beam has a beam waist position at a predetermined position apart from the beam projecting apparatus. The beam projecting apparatus further includes a beam waist position adjusting optical system which is disposed along a light path from the light source to the beam projecting portion, at least one lens element of the beam waist position adjusting optical system being movable along an optical axis thereof; a temperature detecting device for detecting a temperature in the beam projecting apparatus; and a controller for controlling a movement of the at least one lens element in association with the temperature detected by the temperature detecting device so that a deviation of the beam waist position from the predetermined position due to a temperature change is minimized.

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Matsui, Yoshiya, "Introduction to Image-forming Optics", pp. 112-115, published by keigaku Shuppan.

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