Laser diodes with phase conjugate feedback
Laser diodes with phase conjugate feedback Laser diodes with phase conjugate feedback
Risø National Laboratory Fundamental condition for laser action In general, the laser system needs mode suppression from the gratings and a large nonlinear susceptibility. This condition leads to the condition that the angle must be chosen according to: E0 1+ ⎛ nλ ⎞ 1 Is 2arcsin ⎜ θ 2L ⎟ < < ⎝ ⎠ k Dτ s 2 Paul Michael Petersen, Laser Diodes with External Feedback (tutorial)
Risø National Laboratory Nonlinear gratings and mode suppression (Numerical example) Mode suppression Inserting L=1 mm, n=3.4, •=810 nm for GaAlAs we obtain crit = 4.2 Nonlinear gratings For GaAlAs the parameters are D a =13cm 2 /s and R =1 ns and consequently we obtain at 810 nm ½ = 6.5 Mode suppression and strong gratings are obtained when 4.2 < < 6.5° Paul Michael Petersen, Laser Diodes with External Feedback (tutorial)
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Risø National Laboratory<br />
Nonlinear gratings and mode suppression<br />
(Numerical example)<br />
Mode suppression<br />
Inserting L=1 mm, n=3.4, •=810 nm for GaAlAs we<br />
obtain crit<br />
= 4.2<br />
Nonlinear gratings<br />
For GaAlAs the parameters are D a<br />
=13cm 2 /s and R<br />
=1<br />
ns and consequently we obtain at 810 nm ½<br />
= 6.5<br />
Mode suppression and strong gratings are obtained<br />
when 4.2 < < 6.5°<br />
Paul Michael Petersen, <strong>Laser</strong> Diodes <strong>with</strong> External Feedback (tutorial)
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