High-Power Multimode Random Fiber Laser for Speckle-Free Imaging
Abstract
New light sources with low spatial coherence and high brightness are crucial for high-quality imaging. In this paper, such a light source is reported, which is formed by combining random lasing used as seed light with a multimode fiber (MMF) mediated master oscillator power amplifier (MOPA) for power scaling and spatial decoherence. Experimental results show that the proposed multimode random fiber laser (MM-RFL), with low noise, high spectral density, and high power efficiency, can achieve a maximum output power of 100.6 W and speckle contrast of as low as 0.037. Furthermore, MM-RFL-based speckle-free imaging is demonstrated. The imaging quality can be improved by increasing the output power of the MM-RFL as its spatial coherence decreases with an increasing number of effective modes excited in the MMF. Such a MM-RFL provides a powerful light source for speckle-free imaging applications where high power and low spatial coherence are essential for high-quality imaging.
Conflict of Interest
The authors declare no conflict of interest.
Open Research
Data Availability Statement
Research data are not shared.
