Gain dynamics in a heterogeneous terahertz quantum cascade laser

Abstract

The gain recovery time of a heterogeneous active region terahertz quantum cascade laser is studied by terahertz-pump,i terahertz-probe spectroscopy. The investigated active region, which is based on a bound-to-continuum optical transition with an optical phonon assisted extraction, exhibits a gain recovery time in the range of 34-50ps dependent on the operation condition of the laser. The recovery time gets shorter for stronger pumping of the laser while the recovery dynamics slows down with increasing operation temperature. These results indicate the important role of the intracavity light intensity for the fast gain recovery.

References in corpus (5)

• Octave-spanning semiconductor laser
• Modeling techniques for quantum cascade lasers
• Phase resolved measurements of stimulated emission
• Short pulse generation and mode control of broadband terahertz quantum cascade lasers
• Ultra-broadband quantum cascade laser operating from 1.88 to 3.82 THz

Cited by in corpus (5)

• Ultrashort pulse generation from a graphene-coupled passively mode-locked terahertz laser
• Mode-locked ultrashort pulses from an 8 $\mu$m wavelength semiconductor laser
• Self-starting Harmonic Comb Emission in THz Quantum Cascade Lasers
• Homogeneous quantum cascade lasers operating as Terahertz frequency combs over their entire operational regime
• Real-time multimode dynamics of terahertz quantum cascade lasers via intracavity self-detection: observation of self mode-locked population pulsations