Low voltage-defect quantum cascade lasers based on excited-states injection at λ â¼ 8.5 µm.
Appl Opt
; 57(26): 7579-7583, 2018 Sep 10.
Article
em En
| MEDLINE
| ID: mdl-30461827
A quantum cascade laser emitting at λâ¼8.5 µm based on the excited-state injection is presented. The operating voltage is reduced for a low-voltage defect in the excited-state design, compared with the conventional ground-state injection design. The threshold voltage and voltage defect are as low as 6.3 V and 54 mV for a 30-stage active region, respectively. Devices were fabricated through standard buried-heterostructure processing to decrease the heat accumulation. A continuous-wave optical power of 340 mW is obtained at 283 K with a threshold current density of 2.7 kA/cm2. Such a design has the potential to further improve the wall plug efficiency for increased voltage efficiency.
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01-internacional
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MEDLINE
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En
Revista:
Appl Opt
Ano de publicação:
2018
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Article