Direct intensity sampling of a modelocked terahertz quantum cascade laser

作者：Freeman Joshua R^*; Maysonnave Jean; Jukam Nathan; Cavalie Pierrick; Maussang Kenneth; Beere Harvey E; Ritchie David A; Mangeney Juliette; Dhillon Sukhdeep S; Tignon Jerome

来源：Applied Physics Letters, 2012, 101(18): 181115.

DOI：10.1063/1.4765660

Pulses from an actively modelocked terahertz quantum cascade laser are fully characterized using an optical sampling technique to detect the total instantaneous terahertz intensity. By triggering the quantum cascade laser electronics with a femtosecond laser, we are able to measure both the formation of modelocked pulses and the quasi-steady state. The dependence of the pulse width on the modulation power and drive current are investigated. At low drive currents, we measure transform-limited gaussian-shaped pulses with a FWHM of 19 ps.

• 出版日期2012-10-29