Low-spatial-coherence broadband fiber source for speckle free imaging
Abstract
We designed and demonstrate a fiber-based amplified spontaneous emission (ASE) source with low spatial coherence, low temporal coherence, and high power per mode. ASE is produced by optically pumping a large gain core multimode fiber while minimizing optical feedback to avoid lasing. The fiber ASE source provides 270 mW of continuous wave emission, centered at {\lambda}=1055 nm with a full-width half-maximum bandwidth of 74 nm. The emission is distributed among as many as ~70 spatial modes, enabling efficient speckle suppression when combined with spectral compounding. Finally, we demonstrate speckle-free full field imaging using the fiber ASE source. The fiber ASE source provides a unique combination of high power per mode with both low spatial and low temporal coherence, making it an ideal source for full-field imaging and ranging applications.
Keywords
Cite
@article{arxiv.1507.04788,
title = {Low-spatial-coherence broadband fiber source for speckle free imaging},
author = {Brandon Redding and Peyman Ahmadi and Vadim Mokan and Martin Seifert and Michael A. Choma and Hui Cao},
journal= {arXiv preprint arXiv:1507.04788},
year = {2017}
}
Comments
4 pages, 4 figures