Engineering the gain/loss profile of intersubband optical devices having heterogeneous cascades
US6728282B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Oct 22, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical device includes a stack of at least two different intersubband (ISB) optical sub-devices in which the gain/loss profiles of the individual ISB sub-devices are mutually adapted, or engineered, so as to generate a predetermined overall function for the combination. We define this combination device as being heterogeneous since not all of the individual ISB sub-devices are identical to one another. Illustratively, the parameters of each individual ISB sub-device that might be subject to this engineering process include: the peak energy of the ISB optical transitions (emission or absorption) associated with each RT region, the position of each sub-device in the stack; the oscillator strengths of these ISB transitions; the energy bandwidth of each transition; and the total length of the RT and I/R regions of each ISB sub-device. In one embodiment, our approach may be used to engineer a gain profile that has peaks at a multiplicity of different wavelengths, thus realizing a multi-wavelength ISB optical source in which the applied electric field self-proportions itself so that each individual ISB sub-device experiences the appropriate field strength for its particular design. A…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.