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.
