MANHASSET, N.Y. Photodigm Inc. said it has manufactured a 1,310-nanometer grating-coupled surface-emitting (GSE) laser with single-mode output power of up to 6 milliwatts, thereby achieving the performance of a distributed feedback laser with the advantages of a vertical-cavity surface-emitting laser.
Separately, Photodigm said it has received a U.S. government contract worth $1 million to develop a high-power surface-emitting laser.
Photodigm used aluminum indium gallium arsenide and indium phosphide epitaxial material structures and first- and second-order gratings for the distributed Bragg reflectors reflectors and the outcoupler of the GSE laser. The use of proven technology overcomes the obstacle of qualifying new materials an impediment to the development of a surface-emitting 1,310-nm VCSEL, the company said.
Photodigm's device exhibits single-mode operation with output powers up to 6 mW, threshold currents below 20 mA, slope efficiencies of 0.1 mW/mA, data rates of 2.5 Gbits/second and a side-mode suppression ratio greater than 35 dB. A narrow beam divergence of 5° by 7° aids in fiber coupling, and its surface-emitting nature offers efficiencies in both testing and packaging, the company said.
Under a U.S. government contract, Photodigm's GSE laser technology will be used as a base upon which a lens-like lateral layer is included for mode control. The resulting lens-like grating-coupled surface-emitting laser will produce a "high brightness" beam with a wavelength of 975 nm and an output power of up to 10 W, the company said.