Abstract

Among the various lasers being developed, the CSP laser [1] and the BH laser [2] (or the improved version SBH laser [3]) are considered to possess outstanding features for use as coherent sources. In the case of CSP laser, the lasing mode is stabilized by modal discrimination between fundamental and higher order modes provided by the coupling loss in the shoulder region. As a result, the active and cladding layer thicknesses (referred to as d and t, respectively) are crucial parameters to the performance of the CSP laser. In fact, the value of d should be less than 0.1μm and t should be within 0.3 to 0.4μm, as pointed out in Ref. [1]. Meanwhile, the semiconductor laser with stripe width less than carrier diffusion length has not been extensively studied although narrow stripe lasers have been shown to increase mode stability and to exhibit two-lobed far field pattern.

© 1980 Optical Society of America