Mid-infrared quantum cascade laser frequency combs based on multi-section waveguides

Abstract

We present quantum cascade laser (QCL) frequency comb devices with engineered waveguides for managing the dispersion. The QCL waveguide consists of multiple sections with different waveguide widths. The narrow and wide sections of the waveguide are designed in a way to compensate the group velocity dispersion (GVD) of each other and thereby produce a flat and slightly negative GVD for the QCL. The QCL exhibits continuous comb operation over a large part of the dynamic range of the laser. Strong and narrow-linewidth intermode beatnotes are achieved in more than 300 mA wide operation current range. The comb device features also considerably high output power (>380 mW) and wide optical bandwidth (>55 cm-1)

References in corpus (6)

• Coherent Frequency Combs produced by Self Frequency Modulation in Quantum Cascade Lasers
• Semiconductor ring laser frequency combs induced by phase turbulence
• Coherent injection locking of quantum cascade laser frequency combs
• Self-starting harmonic frequency comb generation in a quantum cascade laser
• Mid-infrared feed-forward dual-comb spectroscopy at 3 $\mu$m
• High-resolution and gapless dual comb spectroscopy with current-tuned quantum cascade lasers

Cited by in corpus (2)

• Monolithic Integration of Mid-Infrared Quantum Cascade Lasers and Frequency Combs with Passive Waveguides
• Frequency-modulated combs via on-chip field enhancement