The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
Laser Original
Stable-Spectrum and Narrow-Bandwidth Operation of a High-Brightness Fiber-Coupled Laser Diode Using a Volume Bragg Grating
Yujin ZHENGYoshinori KATOTakashi SEKINENorio KURITAToshiyuki KAWASHIMA
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2022 Volume 50 Issue 9 Pages 538-

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Abstract
The spectral bandwidth was suppressed effectively and the wavelength was stabilized in a high-brightness fiber-coupled laser diode (LD) with an external cavity configuration consisting of an aspheric lens and a volume Bragg grating. The wavelength shift in the external-cavity fiber-coupled LD with variation in current was reduced from 0.98 to 0.018 nm/A. During operation at a drive current of 5.5 A, the external- cavity fiber-coupled LD’s bandwidth was reduced from 1.87 to 0.16 nm and output power of 4.19 W was obtained. The locked power spectral density of the external-cavity fiber-coupled LD increased from 2.4 W/nm to 2619 W/nm.
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