publication . Article . 1999

Determination of single-pass optical gain and internal loss using a multisection device

Thomson, J. D.; Huw Summers; Hulyer, P. J.; Smowton, P. M.; Blood, P.;
Open Access
  • Published: 25 Oct 1999 Journal: Applied Physics Letters, volume 75, pages 2,527-2,529 (issn: 0003-6951, eissn: 1077-3118, Copyright policy)
  • Publisher: AIP Publishing
  • Country: United Kingdom
We describe a technique for the measurement of optical gain and loss in semiconductor lasers using a single, multisection device. The method provides a complete description of the gain spectrum in absolute units and over a wide current range. Comparison of the transverse electric and transverse magnetic polarized spectra also provides the quasi-Fermi-level energy separation. Measurements on AlGaInP quantum well laser structures with emission wavelengths close to 670 nm show an internal loss of 10 cm−1 and peak gain values up to 4000 cm−1 for current densities up to 4 kA cm−2.
free text keywords: QC
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