发明授权
- 专利标题: Article comprising a dual-wavelength quantum cascade photon source
- 专利标题(中): 文章包括双波长量子级联光子源
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申请号: US033250申请日: 1998-03-02
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公开(公告)号: US6144681A公开(公告)日: 2000-11-07
- 发明人: Federico Capasso , Alfred Yi Cho , Jerome Faist , Albert Lee Hutchinson , Carlo Sirtori , Deborah Lee Sivco , Alessandro Tredicucci
- 申请人: Federico Capasso , Alfred Yi Cho , Jerome Faist , Albert Lee Hutchinson , Carlo Sirtori , Deborah Lee Sivco , Alessandro Tredicucci
- 申请人地址: NJ Murray Hill
- 专利权人: Lucent Technologies Inc.
- 当前专利权人: Lucent Technologies Inc.
- 当前专利权人地址: NJ Murray Hill
- 主分类号: H01L33/06
- IPC分类号: H01L33/06 ; H01S5/00 ; H01S5/34 ; H01S3/19
摘要:
The quantum cascade (QC) photon source according to this invention can emit simultaneously at two distinct wavelengths, typically both in the mid-infrared. This is accomplished through provision of a semiconductor layer structure in which, at the proper bias voltage, electrons are injected into an energy level E.sub.3 and then forced to cascade through an intermediate level E.sub.2 before reaching the ground state E.sub.1 of the active region. In the process, photons of energy E.sub.3 -E.sub.2 (wavelength .lambda..sub.1) and E.sub.2 -E.sub.1 (wavelength .lambda..sub.2) are emitted. Dual wavelength photon sources according to this invention can be used in a variety of ways, e.g., to determine the absorption of a gaseous sample at wavelengths .lambda..sub.1 and .lambda..sub.2, exemplarily to determine the concentration of a particular chemical compound in the sample.
公开/授权文献
- USD370257S Ocular solution applicator 公开/授权日:1996-05-28