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Wavelength Stabilized Organic Dye Lasers

IP.com Disclosure Number: IPCOM000090850D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Lankard, JR: AUTHOR [+3]

Abstract

The frequency of an organic dye laser is stabilized to a narrow resonance line by a narrow band Faraday rotation filter placed in the laser cavity. The laser resonant cavity is formed by mirror 1, which is highly reflecting and mirror 2 which is partially transmissive. The Faraday rotation filter 3 comprises the cell 4 of a vapor. such as Na, surrounded by Helmholtz coils or solenoid coils 5 which produce an axial magnetic field H. Crossed polarizers 6 are on either side of cell 4. Due to polarizers 6, light normally does not pass through filter 3. If magnetic field H is adjusted, light at the resonance line of the Na vapor passes through filter 3.

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Wavelength Stabilized Organic Dye Lasers

The frequency of an organic dye laser is stabilized to a narrow resonance line by a narrow band Faraday rotation filter placed in the laser cavity. The laser resonant cavity is formed by mirror 1, which is highly reflecting and mirror 2 which is partially transmissive. The Faraday rotation filter 3 comprises the cell 4 of a vapor. such as Na, surrounded by Helmholtz coils or solenoid coils 5 which produce an axial magnetic field H. Crossed polarizers 6 are on either side of cell
4. Due to polarizers 6, light normally does not pass through filter 3. If magnetic field H is adjusted, light at the resonance line of the Na vapor passes through filter 3. Since a dye laser has efficient spectral condensation if selective feedback is introduced into the cavity, the laser output is locked to the resonant line frequency of the vapor in cell 4. In addition to resonant lines of atoms, molecular bands can be used with the same Faraday mechanism to provide wavelength stabilization.

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