A tunable blue random laser based on solid waveguide gain films with plasmonics and scatters

Lotus-Leaf-Inspired Flexible and Tunable Random Laser

“…As shown in Figure , the photostability of this random lasing device is about 38,000 pulses, which translates into 63.3 min for the pulsed random laser beam to decay to half of its original lasing energy. This is significantly longer than conventional solid-state random lasers and liquid random lasers such as presented in our previous work. , …”

“…This is significantly longer than conventional solid-state random lasers and liquid random lasers such as presented in our previous work. 5,42 The excellent photostability of the random laser may have three origins: (1) the liquid gain medium offers excellent thermal conductivity so that the excess heat may be evacuated in real time; 53 (2) the mobility of the solvent allows degraded DCJTB molecules to diffuse out of the pumping region, facilitating replacement by the fresh laser dye; (3) the sealed gain medium of the system prevents oxygen leakage into the system, which would lead to oxidation and degrade the gain medium. A sealed gain medium also prevents evaporation of the ethanol solvent, which also extends the lifetime of the gain medium and maintains a uniform solution.…”

“…Since the first theoretical report of Letokhov and experimental breakthrough by Lawandy et al, random lasers have greatly attracted the attention of scientists as a booming laser field. In comparison with regular commercial lasers, the random laser is simpler and less costly to manufacture , and easier to tune. − Therefore, it has potential applications in many fields such as imaging, illumination, , sensing, − and information technology …”

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

“…On the other hand, plasmonic random lasers with well controlled properties and low thresholds exhibit growing research interests because of their enhanced light scattering and strong confinement of optical fields. [31][32][33][34][35] The random lasing properties, such as wavelength, [36][37][38][39][40] polarization, [41] spectral profile, [42] and linewidth, [43] can be controlled effectively by plasmonic structures. Wherein, the emission wavelength of the random lasers using plasmonic nanostructures coupled with dye molecules, can be modulated by changing the size of gold nanoisland structure, [36] the thickness of waveguide gain films, [37] and selecting different dye molecules.…”

“…[31][32][33][34][35] The random lasing properties, such as wavelength, [36][37][38][39][40] polarization, [41] spectral profile, [42] and linewidth, [43] can be controlled effectively by plasmonic structures. Wherein, the emission wavelength of the random lasers using plasmonic nanostructures coupled with dye molecules, can be modulated by changing the size of gold nanoisland structure, [36] the thickness of waveguide gain films, [37] and selecting different dye molecules. [39,44] Moreover, the emission tunability of the random laser has been achieved using a waveguide plasmonic gain channel based on stretching silver nanowires in a flexible substrate by mechanical stress, [38] also the spectral tuning can be obtained by changing the thickness of the active medium consisting of disordered silver nanowires embedded in a dye-doped polymer film.…”