Waveguide structure for mid-IR multiwavelength concatenated distributed-feedback laser with an active core made of cascaded stages

摘要

Concatenated distributed feedback lasers having novel waveguides are disclosed. The waveguides allow for coupling of the laser beam between active and passive waveguide structures and improved device design and output efficiency. Methods of making along with methods of using such devices are also disclosed.

主权项

1. A laser comprising:
a. a gain material comprising at least two, compositionally non-identical, layers forming a superlattice, wherein the gain material generates photons by intersubband or interband transitions; b. at least two lasing sections placed in series, wherein each lasing section comprises gratings have non-equivalent periods or Bragg wavelengths, and wherein the lasing sections are separated by an electrical isolation region; and c. a waveguide structure comprising:
i. an active waveguide in contact with the gain material;ii. at least one bridge; andiii. a passive waveguide; wherein:
1. each of the at least one bridge is spatially located between the active waveguide and the passive waveguide; and2. the active waveguide, the at least one bridge, and the passive waveguide are not physically connected via a waveguide material.