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Pulse Transmission Mode Operation of a Laser

IP.com Disclosure Number: IPCOM000090511D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Carlson, DG: AUTHOR

Abstract

Pulse transmission mode operation of a laser utilizes a polarization switch and a single polarization prism and provides output pulse widths that are dependent on the overall cavity length. This laser provides shorter output pulses, not dependent on cavity length. In drawing A, electro-optic polarization switch S is located between polarization prisms P1 and P2. Mirrors M define a resonant cavity for laser medium L. The induced axes of switch S are at 45 degrees to the axes of P1 and P2. Before voltage V is applied to switch S, it is optically isotropic. Laser action occurs in the resonant cavity and then a fast-rising voltage pulse V is applied to switch S. If induced phase retardation due to the applied voltage is pi, a laser pulse is coupled out of the cavity by P2. This pulse is of length 2D2/C.

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Pulse Transmission Mode Operation of a Laser

Pulse transmission mode operation of a laser utilizes a polarization switch and a single polarization prism and provides output pulse widths that are dependent on the overall cavity length. This laser provides shorter output pulses, not dependent on cavity length. In drawing A, electro-optic polarization switch S is located between polarization prisms P1 and P2. Mirrors M define a resonant cavity for laser medium L. The induced axes of switch S are at 45 degrees to the axes of P1 and P2. Before voltage V is applied to switch S, it is optically isotropic. Laser action occurs in the resonant cavity and then a fast-rising voltage pulse V is applied to switch S. If induced phase retardation due to the applied voltage is pi, a laser pulse is coupled out of the cavity by P2. This pulse is of length 2D2/C. A second pulse, of length 2D1/C is coupled out by P1. The voltage pulse V has a finite rise time, so it is desirable to make 2D2/C equal to the rise time of V. In drawing B, prisms P1 and P2 and switch S are outside the laser cavity, as in mirror M. Only a single pulse of length 2D3/C is deflected out by P2.

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