1. Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities
- Author
-
Zhanguo Wang, Chuan-Wei Liu, Dong-Bo Wang, Feng-Min Cheng, Junqi Liu, Ning Zhuo, Shu-Man Liu, Lijun Wang, Fengqi Liu, Shenqiang Zhai, Jinchuan Zhang, and Yue Zhao
- Subjects
Diffraction ,Materials science ,Quantum cascade lasers ,02 engineering and technology ,01 natural sciences ,law.invention ,Semiconductor laser theory ,010309 optics ,Optics ,law ,0103 physical sciences ,lcsh:TA401-492 ,General Materials Science ,Laser power scaling ,Phase locked arrays ,Semiconductor lasers ,business.industry ,Nano Idea ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,Wavelength ,lcsh:Materials of engineering and construction. Mechanics of materials ,Laser beam quality ,0210 nano-technology ,Quantum cascade laser ,business ,Beam divergence - Abstract
Power scaling in broad area quantum cascade laser (QCL) usually leads to the deterioration of the beam quality with an emission of multiple lobes far-field pattern. In this letter, we demonstrate a tapered QCL array integrated with Talbot cavity at one side of the array. Fundamental supermode operation is achieved in the arrays with taper straight-end connected to the Talbot cavity. Lateral far-field of the fundamental supermode shows a near diffraction limited beam divergence of 2.7°. The output power of a five-element array is about three times as high as a single-ridge laser with an emission wavelength of around 4.8 μm. However, arrays with the taper-end connected to the Talbot cavity always show a high-order supermode operation whatever Talbot cavity length is.
- Published
- 2018
- Full Text
- View/download PDF