Design Of Fiber Coupling Of405nm Laser Diode

At present, the high power semiconductor laser with high conversion rate, low energyconsumption and small volume, and many other advantages, in electronic communication,laser medical treatment and material processing has been widely used. However,semiconductor laser is also a problem, it exist the output beam of astigmatism and beamfar-field asymmetry. This leads to low coupling efficiency of optical fiber with high powersemiconductor laser, is a technical problem of high power semiconductor applications.In order to solve the technical problem, this paper first analyzes the encapsulationprinciple and structure of high power semiconductor laser, and with a wavelength of405nmlaser parameter test, summarizes several characteristics of the semiconductor laser beam farfield. Then, the paper also studied the multiple beam composite fiber coupling technology,and on this basis was proposed based on the polarization multiplexing technology of opticalfiber coupling scheme, and the specific optical fiber coupling module of the project design.This design using the polarization composite technology of two wavelength of405nm lasercoupled into fiber to0.35microns.Finally, on the basis of the characteristics of the parameters of the laser diode and fibercoupling of aspheric lens was designed, through the technology the two output wavelengthof405nm, the output power is greater than30mw high power laser diode coupled to thenumerical aperture of0.13,0.35microns of multimode optical fiber core diameter. After thetest, the optical fiber when working current is0.4A, the output power will reach30mw,coupling efficiency reached64%.