Speckle characteristics of a broad-area VCSEL in the incoherent emission regime

Riechert, Falko; Verschaffelt, Guy; Peeters, Michael; Bastian, G.; Lemmer, Uli; Fischer, Ingo

doi:10.1016/j.optcom.2008.05.004

Cited by 22 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our case, however, we do not use mechanically moving parts, and in this work we study optical systems that generate an optical line (instead of the laser projection system in [7]). Our results are also comparable to the previous investigation that we performed on speckle contrast reduction in a projection setup [9][10][11]. We expect that the speckle contrast can be further lowered by increasing the size of the BA-VCSEL, as the number of beamlets is proportional to the VCSEL aperture area.…”

Section: Comparison and Discussionsupporting

confidence: 90%

“…Previous work [9][10][11] has shown that speckle in a projection setup can be reduced by properly exploiting partial spatially coherent laser emission from a broad-area vertical-cavity surface-emititing laser (BA-VCSEL) [12][13][14]. This type of semiconductor laser can be driven into a regime of spatially incoherent emission [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a low-speckle laser line generator

et al. 2012

Self Cite

View full text Add to dashboard Cite

The goal of our investigation is to design a low-speckle laser line generator based on partial spatially coherent laser light. Low speckle is achieved by exploiting a regime of strongly reduced spatial coherence of a broad-area vertical-cavity surface-emitting laser, which is used as the line generator's light source. A comparative experimental study of different optical configurations is conducted, leading to the design of an optimal optical system. The results of our study are also valid for other sources of partial spatially coherent emission.

show abstract

Section: Comparison and Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Characterization of a low-speckle laser line generator

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…e e r y x r (2) Negative values of the pumping outside the central core describe noninversed absorbing medium in the unpumped regions. Parameters L and D in (2) describe, respectively, the effective width of pumping region and the profile slope near the edges.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Though in some applications like projection systems low spatial coherence of laser emission may be even extremely desirable as it allows reducing the speckle contrast [2], usually these complex regimes are assumed to be a harmful effect. Therefore for practical reasons it is highly desirable to suppress these spatiotemporal instabilities.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of class-B broad-area laser emission by external optical injection

Пахомов¹,

Архипов²,

Molevich³

2017

J. Opt. Soc. Am. B

View full text Add to dashboard Cite

We theoretically examine the effect of external optical injection on the spatio-temporal dynamics of class-B broad-area lasers. We demonstrate that optical injection can efficiently stabilize the intrinsic transverse instabilities in such lasers associated with both the boundaries of the pumping area and with the bulk nonlinearities of the active medium. Stabilizing action of optical injection is shown to be closely related to the suppression of inherent relaxation oscillations behavior.

show abstract

“…It is therefore important to devise methods that reduce speckle noise in VCSEL systems. Pulsed current modulation was used in an infrared VCSEL system to reduce speckle noise (Riechert et al 2008). Recently it was shown that a pulsed current reduced the spatial coherence of a visible VCSEL (Verschaffelt and 2016).…”

Section: Objectivesmentioning

confidence: 99%