Laser diodes with phase conjugate feedback
Laser diodes with phase conjugate feedback
Laser diodes with phase conjugate feedback
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Risø National Laboratory<br />
The mode suppression factor<br />
0<br />
Z=0<br />
Semiconductor<br />
amplifier<br />
Electrode<br />
L<br />
Z<br />
Z=L<br />
The output beam is a result of diffraction in the induced gratings inside<br />
the semiconductor amplifier. The diffraction angle ’ inside the<br />
semiconductor is given by: sin θ’ = λ/(Λn). For small angles the <strong>phase</strong><br />
difference between a wave diffracted at the front facet and the back facet<br />
of the amplifier is given by:<br />
δ = 2πnL/λ -2πnLcos θ’/λ = 2πn(1-cosθ’)/λ<br />
Since 1-cosθ’= 2sin 2 (θ’/2) and n sin’ = sin we obtain:<br />
4π<br />
L<br />
δ = Sin<br />
λn<br />
2<br />
θ<br />
2<br />
Paul Michael Petersen, <strong>Laser</strong> Diodes <strong>with</strong> External Feedback (tutorial)
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