Abstract
Random laser with intrinsically uncomplicated fabrication processes, high spectral radiance, angle-free emission, and conformal onto freeform surfaces is in principle ideal for a variety of applications, ranging from lighting to identification systems. In this work, a white random laser (White-RL) with high-purity and high-stability is designed, fabricated, and demonstrated via the cost-effective materials (e.g., organic laser dyes) and simple methods (e.g., all-solution process and self-assembled structures). Notably, the wavelength, linewidth, and intensity of White-RL are nearly isotropic, nevertheless hard to be achieved in any conventional laser systems. Dynamically fine-tuning colour over a broad visible range is also feasible by on-chip integration of three free-standing monochromatic laser films with selective pumping scheme and appropriate colour balance. With these schematics, White-RL shows great potential and high application values in high-brightness illumination, full-field imaging, full-colour displays, visible-colour communications, and medical biosensing.
Highlights
Random laser with intrinsically uncomplicated fabrication processes, high spectral radiance, anglefree emission, and conformal onto freeform surfaces is in principle ideal for a variety of applications, ranging from lighting to identification systems
As an unconventional laser system, random laser is naturally endowed with two key superiorities, namely, laser-level intensity and broad-angular emissions[1,2,3,4], which are mutually exclusive in thermal light sources, light-emitting-diodes (LEDs), and lasers
These monochromatic polymer films (MPFs) are synthesized using solution-processed and self-assembled methods, which are simple, low-cost techniques, and potentially useful for roll-to-roll printing processing and large-scale fabrication (More details of the synthesis of each MPF are provided in the Methods)
Summary
Random laser with intrinsically uncomplicated fabrication processes, high spectral radiance, anglefree emission, and conformal onto freeform surfaces is in principle ideal for a variety of applications, ranging from lighting to identification systems. Fine-tuning colour over a broad visible range is feasible by on-chip integration of three free-standing monochromatic laser films with selective pumping scheme and appropriate colour balance With these schematics, White-RL shows great potential and high application values in high-brightness illumination, full-field imaging, full-colour displays, visible-colour communications, and medical biosensing. Random laser systems can generate spatially incoherent and laser-level radiation, in contrast to those existing illuminant modules (e.g., incandescent bulb, LEDs, superluminescent diodes, and broadband lasers) This angle-free emission is in principle ideal for general lighting (e.g., laser headlights) and consumer products (e.g., spotlight, laser display, and digital laser projector) and even imaging applications (e.g., full-field microscopy and medical sensing).
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