Accession Number:

ADA454561

Title:

Performance Comparison of Optically Pumped Type-II Mid-Infrared Lasers

Descriptive Note:

Journal article postprint, 1 Aug 2004-7 Jul 2005

Corporate Author:

AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE

Report Date:

2005-10-25

Pagination or Media Count:

10.0

Abstract:

We report a comparative study on the performance of three optically pumped, type-II quantum well lasers with differing quantum well QW confinement. One of the active regions emphasized hole confinement, another emphasized electron confinement, while the third incorporated both electron and hole confinements. In all cases the wells were inserted in a thick Insub xGasub 1-xAssub ySb1-y waveguideabsorber region. The lasing wavelengths at 84 K were 2.26, 3.44, and 2.37 microns, respectively. The maximum peak output powers and differential quantum efficiencies eta at 84 K were similar for the hole well and W lasers 13 W, eta0.55, but significantly reduced in the electron-well-only laser 2.3 W, eta0.14. Waveguide loss measurements via the traditional quantum efficiency versus cavity length method and by a Hakki-Paoli method revealed that all three lasers had low waveguide loss that either increased slowly or not at all with increasing temperature. However, the lasers internal efficiency, etasub i, showed a linear decline with increasing temperature, with the etasub i of the electron-well-only laser significantly less than the other two. The data suggest that for antimonide-based type-II designs, strong hole confinement is essential for improved performance. The data further suggest that it is hole leakage from the QW andor hole dilution that is largely responsible for the degradation in laser performance.

Subject Categories:

  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE