An Ultimately Low-Threshold Semiconductor Laser with Separate Quantum Confinements for Single Electron-Hole Pair and Single Photon Field,
Abstract
The threshold pump rate Pth, of a laser is determined by three factors: coupling efficiency Beta of spontaneous emission into a lasing mode, a population inversion parameter nsp for a given pump rate, and photon decay rate gamma (or a photon lifetime Tp=l/gamma), i.e., Pth,=gamma sub sp/IBeta. The population inversion parameter nsp is given by n, sub/sp=Ecv/(Ecv-Ecv) where Ecv and Evc are stimulated emission and absorption rates for one photon in a lasing mode, respectively. The value of Beta is on the order of 10-4 to 10-5 for a conventional semiconductor laser. To decrease the threshold pump rate Pth, we can increase Beta close to one by using a single-mode cavity.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 1992
- Accession Number
- ADP007839
Entities
People
- Masamichi Yamanishi
- Yoshihisa Yamamoto
Organizations
- Hiroshima University