High-Power Single-Mode Tapered Terahertz Quantum Cascade Lasers

Author

Tao Wang ; Junqi Liu ; Fengqi Liu ; Lijun Wang ; Jinchuan Zhang ; Zhanguo Wang

Author_Institution

Key Lab. of Semicond. Mater. Sci., Inst. of Semicond., Beijing, China

Volume

27

Issue

14

fYear

2015

fDate

July15, 15 2015

Firstpage

1492

Lastpage

1494

Abstract

We demonstrate a series of high output power single-mode terahertz quantum cascade lasers based on semi-insulating surface-plasmon waveguide with tapered geometry structure. The taper half-angle is ranging from 0° to 3°. The tapered waveguide effects on the output power and the laser beam quality are experimentally studied. High single longitudinal mode edge-emission peak powers (92.3 mW) are realized. The peak power monolithically increases with the increasing of the taper angle. All distributed feedback (DFB) lasers lased in the temperature range of 70-75 K. The highest brightness is obtained from the 2° laser. Stable single-mode emissions are realized for DFB lasers with the side-mode suppression ratio $sim 18$ dB.

Keywords

brightness; distributed feedback lasers; laser beams; laser modes; quantum cascade lasers; surface plasmons; waveguide lasers; DFB lasers; brightness; distributed feedback lasers; high output power single-mode terahertz quantum cascade lasers; high single longitudinal mode edge-emission peak powers; high-power single-mode tapered terahertz quantum cascade lasers; laser beam quality; power 92.3 mW; semiinsulating surface-plasmon waveguide; side-mode suppression ratio; stable single-mode emissions; taper half-angle; tapered geometry structure; tapered waveguide effects; temperature 70 K to 75 K; Laser beams; Laser modes; Laser theory; Measurement by laser beam; Power generation; Quantum cascade lasers; Distributed feedback lasers; Quantum cascade lasers; Single mode lasers; distributed feedback lasers; single mode lasers;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2426697

Filename

7095529