Frequency-tunable continuous-wave random lasers at terahertz frequencies

Simone Biasco; Harvey E. Beere; David A. Ritchie; Lianhe Li; A. Giles Davies; Edmund H. Linfield; Miriam S. Vitiello

doi:10.1038/s41377-019-0152-z

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Frequency-tunable continuous-wave random lasers at terahertz frequencies

Article

- Frequency-tunable continuous-wave random lasers at terahertz frequencies
- Light: Science & Applications Vol. 8, Issue 3, Pages: 371-383(2019)
- Affiliations：
  
  1.NEST, CNR – Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127, Pisa, Italy
  2.Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK
  3.School of Electronic and Electrical Engineering, University of Leeds, Leeds, LS2 9JT, UK
- Author bio：
  
  Miriam S. Vitiello (miriam.vitiello@sns.it)
- Funds：
- DOI：10.1038/s41377-019-0152-z
  CLC：
- Published：2019，
  
  Published Online：01 May 2019，
  
  Received：11 November 2018，
  
  Revised：20 March 2019，
  
  Accepted：02 April 2019
- Accepted：
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Biasco, S. et al. Frequency-tunable continuous-wave random lasers at terahertz frequencies. Light: Science & Applications, 8, 371-383 (2019).
DOI：

Biasco, S. et al. Frequency-tunable continuous-wave random lasers at terahertz frequencies. Light: Science & Applications, 8, 371-383 (2019). DOI： 10.1038/s41377-019-0152-z.

摘要

Abstract

Random lasers are a class of devices in which feedback arises from multiple elastic scattering in a highly disordered structure

providing an almost ideal light source for artefact-free imaging due to achievable low spatial coherence. However

for many applications ranging from sensing and spectroscopy to speckle-free imaging

it is essential to have high-radiance sources operating in continuous-wave (CW). In this paper

we demonstrate CW operation of a random laser using an electrically pumped quantum-cascade laser gain medium in which a bi-dimensional (2D) random distribution of air holes is patterned into the top metal waveguide. We obtain a highly collimated vertical emission at ~3 THz

with a 430 GHz bandwidth

device operation up to 110 K

peak (pulsed) power of 21 mW

and CW emission of 1.7 mW. Furthermore

we show that an external cavity formed with a movable mirror can be used to tune a random laser

obtaining continuous frequency tuning over 11 GHz.

关键词

Keywords

references

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