Abstract
In this paper, a high brightness fiber-coupled module with a central wavelength of 520 nm is simulated and designed by ray-tracing software ZEMAX and then is experimentally implemented. Three 1-W continuous-wave green LD single emitters based on TO-9-package are successively collimated, spatially combined, and focused into an optical fiber with a core diameter of 50 μm and a numerical aperture of 0.22. The final output power of 1.53 W is obtained, corresponding to an optical–optical conversion efficiency of 51% and an electro-optical conversion efficiency of 10%. The tolerances between the simulation and the experimental result are analyzed and explained.
Highlights
Laser diodes (LDs) in the range of visible wavelength play an increasingly important role in biomedical applications, pumping sources, and laser-based displays, because of the advantages of compactness, long lifetimes, and good reliability
We show a high beam quality fiber-coupled module by combining three 1-W CW TO-can packaged green LDs and coupling them into a 50 μm corediameter / 0.22 numerical aperture (NA) optical fiber
The beam parameter product (BPP) is used to describe the beam quality of LDs, which is defined as the product of beam waist half-width and divergence half-angle (Qi et al 2017)
Summary
Laser diodes (LDs) in the range of visible wavelength play an increasingly important role in biomedical applications, pumping sources, and laser-based displays, because of the advantages of compactness, long lifetimes, and good reliability. For green direct diode laser, it has become an attractively alternative pump source of Ti: sapphire oscillator because of its low cost and without using liquid nitrogen cooling at high power compared to blue LD module. Based on the requirement of end-pumping of Ti: sapphire with a length of 5mm or more, it is necessary to further reduce the core diameter of coupling fiber, for example to an optical fiber with a core diameter of 50 μm, and improve its beam quality. Total output power is over 1.5W, which corresponds to a brightness of 0.608MW (cm sr) Compared with the former pumping source, a 4-folds increase of Rayleigh length, which is about 4 mm, can be obtained. Such a design provides a better choice for pumping longer Ti: sapphire crystals
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