Quantum cascade laser with optical phonon excitation
US6751244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2003 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Mar 4, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y20/00
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
A quantum cascade laser comprising two electrodes (10, 18) for applying an electric control field and a waveguide placed between the two electrodes and which comprises:a gain region (14) consisting of several layers (20) which each comprise alternating strata (22) of a first type each defining a quantum barrier and strata (24) of a second type each defining a quantum well, andtwo optical confinement layers (12, 16) placed on each side of the gain region (14).According to the invention, each layer (20) of the gain region (14) is arranged so that the active region has three subbands, the potential differences between them being such that the transition of an electron between the two furthermost emits an energy (EGH, EHJ) corresponding to that needed for the emission of two optical phonons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.