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Magneto Optic Laser Polarization Modulator

IP.com Disclosure Number: IPCOM000085375D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Chastang, JC: AUTHOR [+2]

Abstract

A magnetic modulator is provided for a gas laser that does not use expensive intra or extra cavity devices so that the laser beam can be quickly switched ON-OFF.

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Magneto Optic Laser Polarization Modulator

A magnetic modulator is provided for a gas laser that does not use expensive intra or extra cavity devices so that the laser beam can be quickly switched ON-OFF.

In conventional gas lasers that do not employ Brewster windows, the laser beams produced are neither fully polarized nor fixed in orientation. If a polarizer is placed in the path of an output beam and then rotated, the light output goes from a maximum to a minimum, but is never extinguished.

In order to attain such extinction, two orthogonally disposed electro-magnetic fields are placed about the laser tube. When either one of the electromagnetic fields is activated, the laser beam becomes polarized and the plane of polarization is in the plane of the applied magnetic field. The polarizer is oriented with respect to the output beam so that when the electromagnet is on, laser light goes through the polarizer and, when the other field is on, light is stopped by the polarizer.

Fig. 1 shows one arrangement for achieving a fast ON-OFF laser switch and Fig. 2 is a schematic view of Fig. 1, showing the pole pieces without the laser and coils about the electromagnets 4 and 6. An internal mirror type gas laser 2 is inserted between the poles of two orthogonally disposed electromagnets 4 and 6, respectively. Element 8 represents a cathode chamber for a typical sidearm laser. Coils 10 and 12 are each associated with their respective electromagnets 4 and 6. A polarizer 14,...