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Keywords:

  • high pressure;
  • InGaAs/GaAs laser diode;
  • optical gain;
  • tunable lasers

Abstract

Wavelength dependent gain has been calculated for InGaAs/GaAs quantum-well (QW) lasers as a function of hydrostatic pressure and temperature. The shift of the gain maximum for such laser is equal to −140 nm by increasing the pressure up to 20 kbar and −60 nm by cooling down from 300 to 100 K. The width of the gain curve (determining the possible tuning range with external grating) is significantly reduced at low temperatures and (to a lower extent) at high pressures. Our results indicate that pressure tuning is much more effective than temperature tuning when combined with tuning by external grating.