Abstract
As 808 nm single emitter diode lasers have low output powers,they are limited to pump neodymium-doped double-cladding fiber lasers in end pumping.In order to enhance the pumping efficiency of the fiber laser by using single emitters,a fiber coupled module with several single emitter diode lasers was developed.First,the fast axis and slow axis of each diode laser were collimated by a micro-lens.Then,the output beams of diode lasers were combined with reflecting prisms.Finally,a suit of optical system designed by ourselves was utilized to expand and focus the beam into a optical fiber.Experiments show that this approach can greatly increase the brightness of the module with fiber coupled LDs.Four LDs with continuou output power of 5 W are coupled in a 105 μm multimode optical fiber with a core diameter of 105 μm and a numerical aperture of 0.2 when the working current is 5.8 A,it can offer the fiber output power of 15.22 W,coupling efficiency of 74% and the brightness over 1.4 MW/cm2·sr.
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