Abstract
We report programmable control of pulses from a quantum cascade laser. A programmable arbitrary waveform generator is used to control the emission of the lasers by gain-switching. Quantum cascade lasers with both multimode and single-mode emission are studied. Laser emission is coherently detected using a phase-resolved injection seeding technique based on time domain spectroscopy. For the single-mode laser, pulse widths of 500–4000 ps are demonstrated, with time–bandwidth products remaining close to, or below, unity for all pulse widths. Additionally, sequences of two pulses are demonstrated, where the pulse widths, delay, and amplitude of each of the pulses are programmed electronically. A range of pulse parameters are explored. This approach allows for the generation of arbitrary terahertz pulse sequences, which will enable coherent multidimensional spectroscopy and applications requiring optimized pulse shapes.
Highlights
We report programmable control of pulses from a quantum cascade laser
In this work we demonstrate how a quantum cascade lasers (QCLs) operating in the THz region can be combined with a gain-switching pulse from an arbitrary function generator and injection seeding to produce shaped, near-transform-limited pulses that can be sampled coherently.[24,25]
We have demonstrated an instrument that allows near-transform-limited pulses to be programed from a terahertz quantum cascade laser with injection-seeded emission so that the pulses can be coherently detected
Summary
We report programmable control of pulses from a quantum cascade laser. A programmable arbitrary waveform generator is used to control the emission of the lasers by gain-switching. In this work we demonstrate how a QCL operating in the THz region can be combined with a gain-switching pulse from an arbitrary function generator and injection seeding to produce shaped, near-transform-limited pulses that can be sampled coherently.[24,25]
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