公开(公告)号：WO2015163965A3

公开(公告)日：2015-12-23

申请号：PCT/US2015014371

申请日：2015-02-04

Applicant: UNIV TEXAS

Inventor： BELKIN MIKHAIL ,  JUNG SEUNGYONG ,  VIJAYRAGHAVAN KARUN

IPC: H01S5/20 ,  H01S5/34

CPC classification number: H01S5/0604 ,  G02F1/3534 ,  G02F2203/13 ,  H01S5/0207 ,  H01S5/0208 ,  H01S5/0422 ,  H01S5/06256 ,  H01S5/06258 ,  H01S5/1021 ,  H01S5/1092 ,  H01S5/12 ,  H01S5/125 ,  H01S5/3401 ,  H01S5/34306

Abstract: A terahertz difference-frequency generation quantum cascade laser source that provides monolithic, electrically-controlled tunable terahertz emission. The quantum cascade laser includes a substrate, a lower cladding layer positioned above the substrate and an active region layer with optical nonlinearity positioned on the lower cladding layer. The active region layer is arranged as a multiple quantum well structure. One or more feedback gratings are etched into spatially separated sections of the cladding layer positioned on either side of the active region. The periodicity of each grating section determines the mid-infrared lasing frequencies. The grating sections are electrically isolated from one another and biased independently. Tuning is achieved by changing a refractive index of one or all of the grating sections via a DC current bias thereby causing a shift in the mid-infrared lasing frequency. In this manner, a monolithic, electrically-pumped, tunable THz source is achieved.

Abstract translation: 太赫兹差频生成量子级联激光源，提供单片式电控可调谐太赫兹发射。 量子级联激光器包括衬底，位于衬底上方的下包层以及位于下包层上的具有光学非线性的有源区域层。 有源区域层被布置为多量子阱结构。 将一个或多个反馈光栅蚀刻到位于有源区任一侧的包层的空间分离部分。 每个光栅部分的周期性决定了中红外激射频率。 光栅部分彼此电隔离并独立偏置。 调谐是通过经由DC电流偏置改变一个或全部光栅部分的折射率，从而引起中红外激光频率的偏移而实现的。 以这种方式，实现了单片式电泵浦可调谐THz源。