Distributed feedback 2.5-terahertz quantum cascade laser with high-power and single-mode emission
| Autor: | Yong Zeng, Jia Li, Jiang Tao, Jian Yu, Zhan Zhiqiang, Weidong Wu, Jiawen Luo, Shen Changle, Ruijiao Zou, Xuemin Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Terahertz radiation General Engineering Single-mode optical fiber 02 engineering and technology Grating Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Wavelength 020210 optoelectronics & photonics Fiber Bragg grating law Cascade 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Optoelectronics Continuous wave business |
| Zdroj: | Optical Engineering. 59:1 |
| ISSN: | 0091-3286 |
| Popis: | The 2.5-terahertz quantum cascade lasers (THz QCLs) based on first-order distributed feedback (DFB) Bragg grating are reported. The loss and threshold gain within different grating duty cycles are calculated according to the mode-coupling theory. The laser output power reaches up to record values of 34.1 mW in pulse mode and 23.4 mW in continuous wave mode at 15 K. The threshold current density is as low as 125 A / cm2. The single-mode emission is achieved, and the side-mode suppression ratio is 12 dB. In addition, the device is bonded together with the other two DFB THz QCLs (2.9 and 3.0 THz) on a copper chip. The simultaneous different wavelength emissions with single mode are successfully realized. |
| Databáze: | OpenAIRE |
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