Laser Gyroscope

Some Description

Team members

Darren e0303300@u.nus.edu

Wen Xin e0309271@u.nus.edu

Idea

This project aims to measure some rotation by using the Sagnac effect, by using a loop of fiber as a ring interferometer.

Sagnac effect When two beams of light are sent into the two ports of a ring interferometer, they travel clockwise (CW) and counter-clockwise (CCW) paths respectively. For a stationary ring interferometer, since the path length traversed by each beam is the same ($L_0=2\pi nR<math>),thisleadstocompleteconstructiveinterferenceattheoutputport.Nowle{t}^{\prime }ssaytheinterferometerisspinningintheCWdirection.Thentherewillbeadifferenceinpathlength:<math>\delta L=R\omega t_{CW}<math>whichresultsinatimingdifferenceof:<math>t_{CW}=\frac{2\pi nR+\mathrm{\Delta }L}{c},t_{CCW}=\frac{2\pi nR-\mathrm{\Delta }L}{c}$

Setup

The main setup will be a fiber based sagnac intereferometer with detection of the output done using photodiodes. We are aiming to build everything in the 1550nm wavelength range.

Measurements

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