Samenvatting
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.
| Originele taal-2 | English |
|---|---|
| Pagina's (van-tot) | 1178-1180 |
| Aantal pagina's | 3 |
| Tijdschrift | Opt. Lett. |
| Volume | 31 |
| Status | Published - 2006 |