Surface-Emitting
Perovskite Random Lasers for Speckle-Free
Imaging
Posted on 2019-08-23 - 16:37
Random
lasers have been ideal illumination sources for speckle-free
and high-speed imaging. Despite their successes, the real applications
of random lasers are facing a long-standing challenge, i.e., the cumbersome size of the illuminating system. Herein, we demonstrate
perovskite-based surface emitting random lasers (SERLs) and explore
their applications in speckle-free imaging. The random lasers are
generated by multiple scattering in a perovskite polycrystalline film
sandwiched by two distributed Bragg reflectors. Owing to the tight
confinement in vertical direction and large number of random resonances,
the wavevectors of random lasers are dominated by their vertical components,
and thus, multimode SERLs with a divergence angle of ∼3–5°
and low spatial coherence are produced. By directly illuminating the
patterns with the SERLs, the notable speckle noises of conventional
optical images have been dramatically suppressed. This research shall
provide a strategy toward the integrated spectral-free imaging systems.
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Liu, Yilin; Yang, Wenhong; Xiao, Shumin; Zhang, Nan; Fan, Yubin; Qu, Geyang; et al. (2019). Surface-Emitting
Perovskite Random Lasers for Speckle-Free
Imaging. ACS Publications. Collection. https://doi.org/10.1021/acsnano.9b04925
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AUTHORS (7)
YL
Yilin Liu
WY
Wenhong Yang
SX
Shumin Xiao
NZ
Nan Zhang
YF
Yubin Fan
GQ
Geyang Qu
QS
Qinghai Song