Single-mode interband cascade laser with a slotted waveguide

Single-transverse-mode Ti:sapphire rib waveguide laser.

Laser operation of Ti:sapphire rib waveguides fabricated using photolithography and ion beam etching in pulsed laser deposited layers is reported. Polarized laser emission was observed at 792.5 nm with an absorbed pump power threshold of 265 mW, which is more than a factor of 2 lower in comparison to their planar counterparts. Measured beam propagation factors M2x and M2y of 1.3 and 1.2, respec...

Title Tunable single-mode slot waveguide quantum cascade lasers

Formaldehyde sensor using interband cascade laser based quartz - enhanced

A novel continuous-wave mid-infrared distributed feedback interband cascade laser was utilized to detect and quantify formaldehyde (H 2 CO) using quartz-enhanced photoacoustic spectroscopy. The laser was operated at liquid-nitrogen temperatures and provided single-mode output powers of up to 12 mW at 3.53 µm (2832.5 cm −1). The noise equivalent (1σ) detection sensitivity of the sensor was measu...

Low-divergence single-mode terahertz quantum cascade laser

The operation of quantum cascade lasers has to date been demonstrated over a broad frequency range in the terahertz spectrum (from 4.4 THz to 1.2 THz)1–3. Most potential applications of terahertz quantum cascade lasers require a source that has an excellent spatial and spectral control of the radiated emission4–7. Here, we present a distributed feedback design of a double-metal waveguide quantu...

Low-loss and single-mode tapered hollow-core waveguides optically coupled with interband and quantum cascade lasers

We report single-mode midinfrared laser beam delivery through a 50-cm-long tapered hollow-core waveguide (HCW) having bore diameter linearly increasing from 200 to 260 μm. We performed theoretical calculations to identify the best HCW-laser coupling conditions in terms of optical losses and single-mode fiber output. To validate our modeling, we coupled the HCW with an interband cascade laser an...