Spatially filtered feedback for mode control in vertical-cavity surface-emitting lasers

Simple item page
dc.contributor.authorCha, Mei Ting
dc.contributor.supervisorGordon, Reuven
dc.date.accessioned2010-06-14T20:04:21Z
dc.date.available2010-06-14T20:04:21Z
dc.date.copyright2008en
dc.date.issued2010-06-14T20:04:21Z
dc.degree.departmentDepartment of Electrical and Computer Engineering
dc.degree.levelMaster of Applied Science M.A.Sc.en
dc.description.abstractTransverse mode control of a vertical-cavity surface-emitting laser (VCSEL) is achieved by spatially filtered optical feedback. The spatial filter consisted of a pinhole, either 42 pm or 81 pm, in the 5.8x magnified VCSEL image plane of a confocal lens arrangement. The pinhole was translated to map out the voltage drop across the VCSEL from spatially-selective feedback. For low injection currents, spatially filtered feedback enabled single fundamental mode operation due to higher-order mode suppression by appropriately locating the pinhole. For higher injection currents with five laser modes, spatial selection of feedback enabled control of the relative mode intensities and wavelengths. The maximum increase in mode intensity achieved was 1.8x for the 42 pm pinhole and 2.-1 . for the 81 µm pinhole. The maximum frequency shift achieved was -2.7 GHz and -7.1 GHz with the 42 p.m and the 81 pm pinholes. The spatially-selective optical feedback produced long-lived changes to the VCSEL even after the feedback was blocked - results for two separate trials where the recovery time was 38 minutes are presented (although results varied for different bias and feedback conditions).en
dc.identifier.urihttp://hdl.handle.net/1828/2850
dc.languageEnglisheng
dc.language.isoenen
dc.rightsAvailable to the World Wide Weben
dc.subjectFiltersen
dc.subjectLasersen
dc.subjectCurrentsen
dc.subjectPinholesen
dc.subject.lcshUVic Subject Index::Sciences and Engineering::Engineering::Electrical engineeringen
dc.titleSpatially filtered feedback for mode control in vertical-cavity surface-emitting lasersen
dc.typeThesisen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
cha_m_MAS.pdf
Size:
49.52 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.82 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Electronic Theses and Dissertations (ETD)
 
University of Victoria Libraries

We acknowledge and respect the Lək̓ʷəŋən (Songhees and Esquimalt) Peoples on whose territory the university stands, and the Lək̓ʷəŋən and W̱SÁNEĆ Peoples whose historical relationships with the land continue to this day.