Translation Try: Photonics

[skysailor]

Japanese: http://www.natureasia.com/ja-jp/nphoton/11/9/nphoton.2017.129/%E4%B8%80%E6%96%B9%E5%90%91%E3%83%95%E3%82%A9%E3%83%88%E3%83%8B%E3%83%83%E3%82%AF%E3%83%AF%E3%82%A4%E3%83%A4%E3%83%BC%E3%83%AC%E3%83%BC%E3%82%B6%E3%83%BC

Official English: https://www.nature.com/nphoton/journal/v11/n9/full/nphoton.2017.129.html

My Go at Translating It:

Unidirectional Photonic Wire Laser

Nature Photonics 11, 9 | Published: September 1, 2017 | doi: 10.1038/nphoton.2017.129

Photonic wire lasers are a new type of laser with a horizontal breadth far smaller than its wavelength. Unidirectional light emission is extremely desirable because most of the laser's output is aimed at the target direction. However, since the horizontal breadth is small in comparison to the wavelength, most of the mode propagates outside the solid core. As a result, the technique used up to now of installing a rear facet on the reflection device cannot be applied, regardless of whether it's a thin film reflector or a distributed Bragg reflector. Now, we present a simple and effective method to implement unidirectionality. We selected a distributed feedback (DFB) terahertz quantum cascade laser as a photonic wire laser platform. It implements unidirectionality with about an 8:1 forward:back output ratio, and the forward light emission laser output is 1.8 times the standard for a bidirectional DFB laser. Furthermore, we achieved an electrical power conversion efficiency of about 1%.