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
Miriam S. Vitiello (miriam.vitiello@sns.it)
纸质出版日期:2019,
网络出版日期:2019-05-01,
收稿日期:2018-11-11,
修回日期:2019-03-20,
录用日期:2019-04-02
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Frequency-tunable continuous-wave random lasers at terahertz frequencies[J]. LSA, 2019,8(3):371-383.
Biasco, S. et al. Frequency-tunable continuous-wave random lasers at terahertz frequencies. Light: Science & Applications, 8, 371-383 (2019).
Frequency-tunable continuous-wave random lasers at terahertz frequencies[J]. LSA, 2019,8(3):371-383. DOI: 10.1038/s41377-019-0152-z.
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.
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.
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