Towards 100 nm Band NIR SLDs

Kostin, Yu. O.; Lapin, P. I.; Прохоров, В. В.; Shidlovsky, V. R.; Yakubovich, S D

doi:10.1117/12.811864

Cited by 6 publications

(1 citation statement)

References 2 publications

(4 reference statements)

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“…The D cavity laser matches these requirements and illustrates the potential for tailoring the spatial and temporal coherence of lasers for target application. In the future, we will explore multiple quantum wells with varying thickness and/or composition to obtain broadband gain 25 which could enable a D cavity laser with even lower temporal coherence and a broader emission spectrum.…”

Section: Discussionmentioning

confidence: 99%

Low Spatial Coherence Electrically Pumped Semiconductor Laser for Speckle-Free Full-Field Imaging

Redding¹,

Cerjan²,

Huang³

et al. 2015

Imaging and Applied Optics 2015

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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 chipscale, 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.chaotic cavity | mode competition | spatial coherence S patial coherence is a defining characteristic of laser emission. High spatial coherence allows focusing electromagnetic energy to a small spot or collimation of an optical beam over a long distance. However, spatial coherence can also introduce coherent artifacts such as speckle, because any uncontrolled scattering in the imaging system can cause multipath interference. These artifacts have limited the use of lasers in full-field imaging applications ranging from traditional wide-field microscopes to laser projectors, holography, and photolithography systems. Instead, traditional low spatial coherence sources such as thermal light sources and light-emitting diodes (LEDs) are still used for illumination in most full-field imaging applications, despite having lower power per mode, poor collection efficiency, and less spectral control than lasers. These limitations are particularly pronounced in applications requiring high-speed imaging or imaging in absorbing or scattering media, prompting the use of raster-scanning-based laser imaging systems. For parallel imaging and projection applications, the ideal illumination source would combine the high power per mode of a laser with the low spatial coherence of an LED. The common approach to achieve this combination is by reducing the effective spatial coherence of a traditional laser using, e.g., a spinning diffuser (1), a colloidal solution (2), or a microelectromechanical mirror (3). However, these techniques require averaging over many speckle patterns in time, mitigating the advantage of using bright sources such as lasers or superluminescent diodes for high-speed imaging applications. Another approach to suppress speckle is by taking advantage of the low temporal coherence of broadband sources like superluminescent diodes (SLDs) ...

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Section: Discussionmentioning

confidence: 99%