Abstract
A strong reduction of spatial coherence of the emission of large aperture vertical-cavity surfaceemitting
lasers occurs when they are driven by microsecond electrical pulses [1]. In this letter
we study the influence of this partial spatial coherence on the propagation characteristics. The
spatial decoherence manifests itself in the formation of a Gaussian far field intensity distribution.
We measure the transverse pulse profile from near to far field and see that the shape-invariant far
field regime starts after 140 micrometer in the pulsed regime as opposed to several centimeters
in continuous wave. This matches quantitatively with calculations using a full partially coherent
propagation model without any free fitting parameters.
lasers occurs when they are driven by microsecond electrical pulses [1]. In this letter
we study the influence of this partial spatial coherence on the propagation characteristics. The
spatial decoherence manifests itself in the formation of a Gaussian far field intensity distribution.
We measure the transverse pulse profile from near to far field and see that the shape-invariant far
field regime starts after 140 micrometer in the pulsed regime as opposed to several centimeters
in continuous wave. This matches quantitatively with calculations using a full partially coherent
propagation model without any free fitting parameters.
Original language | English |
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Pages (from-to) | 1178-1180 |
Number of pages | 3 |
Journal | Opt. Lett. |
Volume | 31 |
Publication status | Published - 2006 |
Keywords
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