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Linewidth narrowed vertical-cavity surface-emitting lasers for millimeter-wave generation by optical heterodyning

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4 Author(s)
Dowd, P. ; Dept. of Electr. & Electron. Eng., Bristol Univ., UK ; White, I.H. ; Tan, M.R.T. ; Wang, S.Y.

Narrow beat-note linewidths as low as 190 kHz have been obtained by optically heterodyning two vertical-cavity surface-emitting lasers (VCSELs) whose linewidths are minimized by optical feedback. Narrow line operation has been achieved stably at frequencies up to a detector limited value of 25 GHz for both free space and fiber-loop arrangements

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:3 ,  Issue: 2 )