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2 Optica Applicata

2 2001

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Selectivity properties of circular grating DFB/DBR lasers with phase shift.

Szczepański P., Tarasiuk S.

Optica Applicata

2001

Vol. 31, nr 2

351-371

A threshold analysis is presented for circular grating distributed feedback (CG-DFB) and circular grating distributed Bragg reflector (CG-DBR) lasers with additional phase shift introduced in the grating region. It is found that the proper value and position of the additional phase shift reduces the threshold gain of the laser structure and also improves its mode selectivity

Crucial structure elements of possible nitride vertical-cavity surface-emitting lasers

Nakwaski W., Maćkowiak P.

Optica Applicata

2001

Vol. 31, nr 2

337-349

Problems connected with designing possible nitride vertical-cavity surface-emitting lasers (VCSELs) for their efficient room-temperature (RT) operation are discussed and analyzed. Crucial elements of the VCSEL geometry, i.e. active regions, spacers, DBR mirrors, current and heat-flux paths, substrates as well as contacts, are examined in detail taking into account the latest achievements of the currently available technology. An impact of various structure configurations on threshold properties of the possible RT CW nitride VCSELs is discussed and the most recommended structure details are chosen. A possibility to manufacture efficient nitride VCSELs in a close future is considered and discussed.