Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 5, Pages 1304-1309Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1419672112
Keywords
chaotic cavity; mode competition; spatial coherence
Categories
Funding
- National Institutes of Health [1R21EB016163-01A1]
- National Science Foundation (NSF) [DMR-1307632, DMR-1205307]
- Office of Naval Research [ONR MURI SP0001135605]
- Yale Institute for Nanoscience and Quantum Engineering
- NSF Materials Research Science and Engineering Center [DMR-1119826]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1205307] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1307632] Funding Source: National Science Foundation
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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 similar to 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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