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Polarization switching during the turn-on of a VCSEL

This research studied the polarization switching during theturned on of a VCSEL. The switching periods and beam profilewere investigated by the variation of the driving current and heat sink temperature of the laser. The laser would present a series of polarization switching before it achieved the stable state. At a laser¡¦s current of 5.5 mA, the laser first output in Y-polarization for a period of T1 after the laser was turned on. Then the laser switched to X-polarization and maintained for a period of T2. In the third period of T3, the laser switched to Y-polarization and followed by a final switch to X-polarization. We found that the switching periods would decrease under higher temperature and larger driving current, while the ratio of T2 /T1 and T3/T2 did not change, approximating to a constant of e2.We also found that the beam profile of X-polarization would change periodically with a period of 0.32 mA in the region of 3.5 to 6.0 mA. These results will help to understand the mechanism of the polarization switching when the
laser is turned on.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0622107-090715
Date22 June 2007
CreatorsChang, Wei
ContributorsJang, Der-Jun, Kuo, Wang-Chuang, Tu, Li-Wei, Yen, Tsu-Chiang
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0622107-090715
Rightsnot_available, Copyright information available at source archive

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