Spectral gain measurements for semiconductor laser diodes
Spectral gain studies were carried out for two different laser diode structures from the recordings of Fabry-Perot modes. The Cassidy method [1] was found to be superior to other methods for determining gain and for application even at laser threshold. Maximum gain versus current values were derived for both AlGaAs/ GaAs and InGaAsP/InP lasers, and showed good agreement with published theoretical values [2, 3].