AI Article Synopsis
- The new chip-scale semiconductor laser design features high power per mode and significantly reduced spatial coherence compared to traditional lasers, minimizing coherent artifacts like speckle.
- This laser uses a chaotic, D-shaped cavity to achieve multimode lasing, operating simultaneously in about 1,000 independent modes, resulting in very low spatial coherence.
- The innovative laser offers a cost-effective solution that blends the advantages of both LEDs and laser sources, paving the way for enhanced full-field imaging and projection technologies.
Article Abstract
The spatial coherence of laser sources has limited their application to parallel imaging and projection due to coherent artifacts, such as speckle. In contrast, traditional incoherent light sources, such as thermal sources or light emitting diodes (LEDs), provide relatively low power per independent spatial mode. Here, we present a chip-scale, electrically pumped semiconductor laser based on a novel design, demonstrating high power per mode with much lower spatial coherence than conventional laser sources. The laser resonator was fabricated with a chaotic, D-shaped cavity optimized to achieve highly multimode lasing. Lasing occurs simultaneously and independently in ∼1,000 modes, and hence the total emission exhibits very low spatial coherence. Speckle-free full-field imaging is demonstrated using the chaotic cavity laser as the illumination source. The power per mode of the sample illumination is several orders of magnitude higher than that of a LED or thermal light source. Such a compact, low-cost source, which combines the low spatial coherence of a LED with the high spectral radiance of a laser, could enable a wide range of high-speed, full-field imaging and projection applications.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4321308 | PMC |
| http://dx.doi.org/10.1073/pnas.1419672112 | DOI Listing |
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