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Double Fabry-Perot Filter

IP.com Disclosure Number: IPCOM000076200D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Grischkowsky, D: AUTHOR [+2]

Abstract

A sharp, low-loss, continuously-tunable and stable transmission filter has been developed for frequency locking of dye lasers.

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Double Fabry-Perot Filter

A sharp, low-loss, continuously-tunable and stable transmission filter has been developed for frequency locking of dye lasers.

A dye laser comprises a transparent dye cell that houses the dye that is placed in an optical cavity comprising mirrors M1 and M2.

The dye cell can be pumped either by a flash tube that surrounds the cell or by the output of a laser that is incident on a side of that cell. If longitudinal pumping is used, the output of the pumping laser enters the dye cell through mirror M1. To obtain the desired sharp output, two Fabry-Perot (F-P) interferometers are located in the laser cavity. F-P #1 is tilted in the horizontal plane and F-P interferometer #2 is tilted in the vertical plane. By changing these tilting angles as well as choosing the proper concentration of dye in the cell, one is able to select a very sharp frequency output and that frequency is tunable. The frequency of light transmission maxima can be changed continuously by changing the angle between the normal of the double F-P filter and the propagation vector of incident light.

It is required that the Fabry-Perot interferometers each have high finesse as well as incommensurate spectral ranges. The double F-p filter, as compared with a single F-P filter, produces narrower transmission maxima and the frequency interval between such maxima is greatly increased.

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