Optical EngineeringModeling the near-field and far-field modes of single spatial mode laser diodes
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A set of analytical equations are proposed to describe the near elliptical shape mode of a typical single spatial mode laser diode (SD). A general theoretical model is established to analyze and explain the near field and far field modes of the SD. The model takes into account the material loss of laser waveguide, and the results agree better with measurement results. The model parameters can be adjusted to be applicable to different types of SDs.