Realization of dot DFB lasers

GaInAsP/InP Multiple-Layered Quantum-Wire Lasers Fabricated by CH4/H2 Reactive-Ion Etching

“…From among the various fabrication methods reported to date, for example, self-organization 4) and growth on a patterned substrate, 5) we chose the etching and regrowth method, [6][7][8][9] which is excellent in the size and position control of Q-Wire and Q-Box structures. Furthermore, this fabrication technique is suitable for use in the production of distributed feedback (DFB) lasers.…”

Intrinsic carrier capture time in deep-etched quantum-box (70 nm diameter) lasers at low temperature: An indication of extremely high quantum capture efficiency

“…This offers the possibility of operating the QB laser in a gain-coupled distributed feedback ͑DFB͒ laser which is a dynamic single-mode property. 5 Meanwhile, accurate control of QB distribution offers more chances to separate the intrinsic effect of the QB from the geometry related effect in the QB system through a systematical comparison of QB lasers with different packing densities of the QB. For lowdimensional quantum well and wide-wire lasers, the role of the packing density of the active medium on carrier capture dynamics has been identified both theoretically 14 and experimentally.…”

“…Semiconductor lasers with QBs as the active medium, which can be produced by self-organization 1-4 or etching techniques, 5 have been achieved by several research groups recently. The expected low threshold and reduced temperature sensibility have been demonstrated.…”

“…The longitudinal periodic arrangement of the QB was designed for DFB single-mode laser operation. 5 In this work, QB DFB lasers with the same box size but different packing densities were processed. This was realized by 2D QB lattices with different primitive cells, i.e., different distribution densities.…”

“…The dependence of the laser emission wavelength on the QB DFB period reflects that the stimulated emission arises from the QB. 5 Emission dynamics of the QB lasers were systematically investigated under ultrashort ͑ϳ2 ps͒ optical pulse excitation. The dynamic photon responses of the lasers were measured with a standard light frequency up-conversion technique.…”