We will present new developments in THz coherent photonics enabled by a recently demonstrated broadband planarized platform based on quantum cascade gain medium. The possibility to integrate onto the same chip active (lasers, detectors, amplifiers) and passive (waveguides, splitters, antennas, chirped mirrors,) photonic elements results extremely attractive, naturally bridging microwaves to THz waves. Such approach allows the adoption of advanced photonics design techniques (inverse design) to tailor facet reflectivities in double metal, subwavelength waveguides.
We will present frequency combs exceeding 1 THz bandwidth, operating above liquid nitrogen temperature, with regular far fields and vertical emission. We will as well discuss laser dynamics engineering exploiting extreme field confinement in narrow waveguides, clearly demonstrating FM comb operation in THz QCLs. By exploiting dispersion compensation in planarized double ring cavities we will finally present the achievement of dissipative Kerr solitons with pulses of 10 ps. The application of such waveguides to high-temperature active regions allows the operation of 4 THz QCLs on Peltier cooler with currents below 2.5 A
We present a high-performance planarized waveguide THz quantum cascade laser frequency comb, where an inverse-designed active waveguide front facet with a reduced reflectivity is coupled to a patch array antenna, and all the components are optimized for an octave-spanning emission spectrum (2-4 THz). Broadband frequency comb states spanning over 800 GHz with a single narrow RF beatnote up to -50 dBm are measured at 20 K. The slope efficiency is improved by around five times, with a peak output power of 13 mW in pulsed mode (10% duty cycle at 20 K). Far-field measurements of the surface emission display a narrow symmetric pattern with a beam width of (21° x 20°).
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