Short pulse generation and mode control of broadband terahertz quantum cascade lasers
arXiv:1605.09528 · doi:10.1364/OPTICA.3.001087
Abstract
We report on a waveguide engineering technique that enables the generation of a bandwidth up to 1 THz and record ultra-short pulse length of 2.5 ps in injection seeded terahertz quantum cascade lasers. The reported technique is able to control and fully suppress higher order lateral modes in broadband terahertz quantum cascade lasers by introducing side-absorbers to metal-metal waveguides. The side-absorbers consist of a top metalization set-back with respect to the laser ridge and an additional lossy metal layer. In continuous wave operation the side-absorbers lead to octave spanning laser emission, ranging from 1.63 to 3.37 THz, exhibiting a 725 GHz wide at top within a 10 dB intensity range as well as frequency comb operation with a bandwidth of 442 GHz. Numerical and experimental studies have been performed to optimize the impact of the side-absorbers on the emission properties and to determine the required increase of waveguide losses. Furthermore, these studies have led to a better understanding of the pulse formation dynamics of injection-seeded quantum cascade lasers.
References in corpus (3)
Cited by in corpus (22)
- Terahertz Pulse Shaping Using Diffractive Surfaces
- QCL-based frequency metrology from the mid-infrared to the THz range: a review
- Ultrashort pulse generation from a graphene-coupled passively mode-locked terahertz laser
- Ultra-broadband quantum cascade laser operating from 1.88 to 3.82 THz
- High dynamic range, heterogeneous, terahertz quantum cascade lasers featuring thermally-tunable frequency comb operation over a broad current range
- Planarized THz quantum cascade lasers for broadband coherent photonics
- Terahertz pulse generation by two-color laser fields with circular polarization
- Self-starting Harmonic Comb Emission in THz Quantum Cascade Lasers
- Coherent multi-mode dynamics in a Quantum Cascade Laser: Amplitude and Frequency-modulated Optical Frequency Combs
- Dynamics of a broad-band Quantum Cascade Laser. From chaos to coherent dynamics and mode-locking
- Passive and hybrid mode locking in multi-section terahertz quantum cascade lasers
- Harmonic frequency combs in quantum cascade lasers: time-domain and frequency-domain theory
- Active Stabilization of Terahertz Semiconductor Dual-Comb Laser Sources Employing a Phase Locking Technique
- Gain dynamics in a heterogeneous terahertz quantum cascade laser
- Ultrafast terahertz detectors based on three-dimensional meta-atoms
- Multi-mode Dynamics of Terahertz Quantum Cascade Lasers: spontaneous and actively induced generation of dense and harmonic coherent regimes
- Frequency-modulated combs via on-chip field enhancement
- Intensity autocorrelation measurements of quantum cascade laser frequency combs in the Terahertz range
- Broadband monolithic extractor for metal-metal waveguide based terahertz quantum cascade laser frequency combs
- Coexisting frequency combs spaced by an octave in a monolithic quantum cascade laser
- Control of the Oscillatory Interlayer Exchange Interaction with Terahertz Radiation
- III-V on CaF2: a possible waveguiding platform for mid-IR photonic devices