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Browse Prior Art Database

Fast Tuning Distributed Feedback Laser

IP.com Disclosure Number: IPCOM000078552D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Pennington, KS: AUTHOR [+2]

Abstract

This description relates to a system for rapid modulation and tuning of a thin-film laser, which employs travelling or standing acoustic waves in a lasing medium to provide a periodic strain, and hence a periodic index of refraction along the laser medium which results in reflection and, therefore, feedback within the lasing medium.

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Fast Tuning Distributed Feedback Laser

This description relates to a system for rapid modulation and tuning of a thin- film laser, which employs travelling or standing acoustic waves in a lasing medium to provide a periodic strain, and hence a periodic index of refraction along the laser medium which results in reflection and, therefore, feedback within the lasing medium.

Changing the acoustic frequency of the waves changes the optical frequency (scan wavelength), and changing the acoustic amplitude of the waves results in amplitude modulation of the optical wave.

The proposed system can also be used for bulk lasers using bulk acoustic waves.

An embodiment is shown in the figure, wherein the lasing medium is a thin- film optical wave guide with a high-reflectivity film at one end. An acoustic transducer is located on the high-reflectivity film to generate acoustic wave fronts in the thin-film optical wave guide. Laser action is produced in the wave guide by pumping from either an external electron or optical beam directed onto the wave guide. The feedback necessary for lasing is provided by the high-reflectivity film and the acoustic field. The thin-film wave guide may be fabricated from a rare earth material, a dye impregnated film, or some semiconductor material.

The tuning and/or modulation of the laser is accomplished by changing the acoustic wavelength of the wave fronts in the film, by changing the frequency of the input signal of the input transducer. This...