Abstract
A high-power narrow-linewidth laser system based on a tapered semiconductor optical amplifier in external cavity is demonstrated. The external cavity laser system uses a new tapered amplifier with a super-large optical-cavity (SLOC) design that leads to improved performance of the external cavity diode lasers. The laser system is tunable over a 29 nm range centered at 802 nm. As high as 1.95 W output power is obtained at 803.84 nm, and an output power above 1.5 W is achieved from 793 to 812 nm at operating current of 3.0 A. The emission linewidth is below 0.004 nm and the beam quality factor M2 is below 1.3 over the 29 nm tunable range. As an example of application, the laser system is used as a pump source for the generation of 405 nm blue light by single-pass frequency doubling in a periodically poled KTiOPO4. An output power of 24 mW at 405 nm, corresponding to a conversion efficiency of 0.83%/W is attained.
Highlights
High-power, narrow linewidth and diffraction-limited semiconductor lasers are of interest for applications such as nonlinear frequency conversion, solid-state laser pumping, and free-space optical communication
Based on a bulk diffraction grating external cavity, diffraction-limited, high-power (~1 W) narrow linewidth tapered oscillators were demonstrated, and the emission wavelength was tunable over a 35 nm span centered at 852 nm[13], a 20 nm range centered at 970 nm[14] and a 17 nm range centered at 783 nm.[15]
A 1.95W, narrow linewidth and diffraction-limited semiconductor laser system based on a tapered amplifier in bulk diffraction grating external cavity is demonstrated
Summary
High-power, narrow linewidth and diffraction-limited semiconductor lasers are of interest for applications such as nonlinear frequency conversion, solid-state laser pumping, and free-space optical communication. Broad-area diode lasers can produce large amounts of optical power and are attractive due to their compactness, long lifetimes and relatively low price, these devices suffer from poor spatial and temporal coherence due to their broad emitter aperture in the slow axis, typically from several tens to a few hundred microns. Several techniques, such as injection locking[1,2] with an external single-mode master laser and various external cavities with frequency-selective elements[3,4] have been developed to improve the beam quality and temporal coherence. Using this laser system as a pumping source, 24 mW blue light at 405 nm is obtained by single-pass frequency doubling in a periodically poled KTiOPO4 (PPKTP)
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