Investigation of mid-infrared type-II W diode lasers

We report an experimental investigation of 16 different mid-infrared diode laser samples with type-II "W" active regions. A number of design modifications were employed to study effects on the I-V characteristics, lasing threshold, and wallplug efficiency. Contrary to expectations, the thr...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of electronic materials 2006-03, Vol.35 (3), p.453-461
Hauptverfasser: CANEDY, C. L, BEWLEY, W. W, LINDLE, J. R, KIM, C. S, KIM, M, VURGAFTMAN, I, MEYER, J. R
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:We report an experimental investigation of 16 different mid-infrared diode laser samples with type-II "W" active regions. A number of design modifications were employed to study effects on the I-V characteristics, lasing threshold, and wallplug efficiency. Contrary to expectations, the threshold current density at low temperatures did not vary significantly with the number of active quantum-well periods, nor was there any clear correlation between lasing threshold and photoluminescence intensity. A shorter-wavelength device (3.2-3.6 µm) produced >500 mW of cw power at 80 K, and a second device displayed a wallplug efficiency >10%. The maximum lasing temperature was 317 K for pulsed operation and 218 K for cw operation. At T = 100 K, cavity-length studies indicated an internal loss of 7 cm^sup -1^ and nominal internal efficiency of 96%. Hakki-Paoli measurements of the gain spectrum implied an intrinsic linewidth enhancement factor of ~1.3, which slightly exceeds the theoretical prediction. Longer-wavelength devices (λ [asymptotically =] 3.8-4.5 µm) showed similarly low threshold current densities at T = 80 K but degraded more rapidly with increasing temperature. [PUBLICATION ABSTRACT]
ISSN:0361-5235
1543-186X
DOI:10.1007/BF02690532