Programmable Random Lasing Pulses Based on Waveguide‐Assisted Random Scattering Feedback

Abstract

Programmable random lasing pulses are highly desired due to their promising applications in information security, flexible encoding systems, and smart imaging. However, the fixed random scattering configuration hinders their realization. Herein, a programmable random laser is designed to dynamically regulate random lasing pulses through introducing an external waveguide structure with random scattering feedback. Liquid and solid film random lasers are thus separately achieved. Most importantly, various pulse time series of random lasing can be flexibly realized by switching the adhesion/separation state between the gain and the destroyed waveguide structure. The Feinam coding system is further realized for encryption and information transmission by combining programmable random pulses. The results may widely expand the application prospects of random lasers in the fields of optical data recording, dynamic security labels, smart sensing, and flexible imaging.

Tunable Optical Vortex from a Nanogroove-Structured Optofluidic Microlaser

“…As depicted in Figure f, the lasing spectra and the CCD images of the optical vortices demonstrate switching between yellow and green lasing operations at different times. The dynamic tuning of optical vortices may find applications in temporal encoding as well as temporally modulated super-resolution imaging . Similar to the pumping scheme in Figure a and b, the laser modes were also generated by pumping one end of an individual nanogroove structure.…”

Tunable Plasmonic Random Laser Based on Emitters Coupled to Plasmonic Resonant Nanocavities of Silver Nanorod Arrays

“…Random lasers, different from conventional lasers that are based on cavity mirror feedback, are generated by multiple light scattering associated with a disordered optically gain medium. [1][2][3] Owning to the advantages of random lasers such as simplicity, small size and low spatial coherence, [4][5][6] such lasers have been extensively studied in various fields including speckle-free imaging, [4,7] super-resolution spectroscopy, [8] information security, [9] sensing, [10,11] and biomedical. [12] Nevertheless, controlling the emission wavelength of random lasers is still challenging due to the absence of optical cavity, which limits their applications in some fields such as medical detection, [13] photonic crystals, [14,15] and high-precision sensors.…”

Programmable Rainbow-Colored Optofluidic Fiber Laser Encoded with Topologically Structured Chiral Droplets

“…Micro-and nanolasers are introducing paradigms in a broad range of applications, such as integrated photonics, 1−3 communication, 4,5 lighting, 6,7 multicolor display, 8−10 and biological detections. 11−14 In particular, recent development in programmable microlasers has attracted great attention for its capability to control optical properties in various aspects, including lasing direction, 15 lasing pulses, 16 and lasing emission wavelengths. 17 Numerous investigations on optical cavity structures and materials have been delivered to improve the optical performance of various lasers in the past decade, including semiconductor laser diodes, 18 quantum dot lasers, 19 organic microlaser arrays, 20 plasmonic nanolasers, 21 and optofluidic fiber lasers.…”

“…Micro- and nanolasers are introducing paradigms in a broad range of applications, such as integrated photonics, − communication, , lighting, , multicolor display, − and biological detections. − In particular, recent development in programmable microlasers has attracted great attention for its capability to control optical properties in various aspects, including lasing direction, lasing pulses, and lasing emission wavelengths . Numerous investigations on optical cavity structures and materials have been delivered to improve the optical performance of various lasers in the past decade, including semiconductor laser diodes, quantum dot lasers, organic microlaser arrays, plasmonic nanolasers, and optofluidic fiber lasers. − Among these, optofluidic fiber lasers (OFLs), which take advantage of integrating fiber cavities and aqueous gain medium, have contributed significantly to the development of compact photonic devices. − Optofluidics provides the microfluidic reconfigurability and the photonic integration to embrace excellent prospects in developing miniaturized coherent light sources with programmable laser spectrum tuning and reconstruction. − One of the most promising features of OFLs is the ability to achieve multicolor or multi-wavelength lasing emission over a broad spectral range, which is particularly useful in biochemical sensing and imaging. , …”