Please use this identifier to cite or link to this item:
|Title:||Electrically pumped semiconductor laser with low spatial coherence and directional emission||Authors:||Kim, Kyungduk
Liew, Seng Fatt
Engineering::Electrical and electronic engineering
|Issue Date:||2019||Source:||Kim, K., Bittner, S., Zeng, Y., Liew, S. F., Wang, Q., & Cao, H. (2019). Electrically pumped semiconductor laser with low spatial coherence and directional emission. Applied Physics Letters, 115(7), 071101-. doi:10.1063/1.5109234||Series/Report no.:||Applied Physics Letters||Abstract:||We design and fabricate an on-chip laser source that produces a directional beam with low spatial coherence. The lasing modes are based on the axial orbit in a stable cavity and have good directionality. To reduce the spatial coherence of emission, the number of transverse lasing modes is maximized by fine-tuning the cavity geometry. In a cavity with the size of hundreds of micrometers, 1000 transverse modes lase simultaneously and independently, reducing the speckle contrast to 0.03. Decoherence is reached in a few nanoseconds as a result of frequency detuning of lasing modes. Such rapid decoherence will facilitate applications in ultrafast speckle-free full-field imaging.||URI:||https://hdl.handle.net/10356/90317
|ISSN:||0003-6951||DOI:||http://dx.doi.org/10.1063/1.5109234||Rights:||© 2019 The Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of The Author(s).||Fulltext Permission:||embargo_20200819||Fulltext Availability:||With Fulltext|
|Appears in Collections:||EEE Journal Articles|
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.