Transverse mode control in wide-single-stripe lasers by loading modal filters

Preliminary studies demonstrate the effectiveness of modal filters for controlling transverse modes in wide-single-stripe SBA (self-aligned bent-active-layer) lasers by means of two methods. The first uses a flared waveguide SBA laser while the other uses a wide-stripe SBA laser with a modal reflector at the output facet. Both lasers demonstrate single-lobed far-field patterns. These preliminary experiments show that both modal filters are effective for transverse-mode control. Higher output power in the fundamental transverse mode can be attained by combining these two modal filters.<>