Effect of emitter number on quantum cascade laser monolithic phased array

Naurois, G. M. de; Carras, Mathieu; Maisons, G.; Marcadet, X.

doi:10.1364/ol.37.000425

Cited by 13 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But, we show here that if a deterministic relative phase can be imposed upon devices in an array, then one can reduce the beam divergence and increase the output power by increasing the effective device emission surface. This cannot be achieved using evanescent coupling [17] or leaky-wave coupling via an antiguide configuration [18,19] given the extreme confining properties of metal-metal waveguides. Note however that Kao et al demonstrated a phase-locked array (up to 6 elements) of THz second-order, low-output-power DFB lasers using propagating wave coupling, i.e.…”

Section: Introductionmentioning

confidence: 99%

Phase-locked arrays of surface-emitting graded-photonic-heterostructure terahertz semiconductor lasers

Halioua¹,

Xu²,

Moumdji³

et al. 2015

Opt. Express

View full text Add to dashboard Cite

Abstract:We have demonstrated that a hybrid laser array, combining graded-photonic-heterostructure terahertz semiconductor lasers with a ring resonator, allows the relative phase (either symmetric or anti-symmetric) between the sources to be fixed by design. We have successfully phase-locked up to five separate lasers. Compared with a single device, we achieved a clear narrowing of the output beam profile.

show abstract

Section: Introductionmentioning

confidence: 99%

Phase-locked arrays of surface-emitting graded-photonic-heterostructure terahertz semiconductor lasers

Halioua¹,

Xu²,

Moumdji³

et al. 2015

Opt. Express

View full text Add to dashboard Cite

show abstract

“…On the other hand, in a wide‐ridge laser, a high‐order lateral mode will appear and lead to a bad far‐field profile. Naturally, the array is incorporated into the QCLs to achieve high output power [7]. However, the presence of gain only in the strong index region will favour the out‐of‐phase supermode, leading to at least a two lobes far‐field pattern for phase‐locked QCL array sources.…”

Section: Introductionmentioning

confidence: 99%

Monolithically integrated terahertz quantum cascade array laser

et al. 2013

View full text Add to dashboard Cite

By integrating triple terahertz quantum cascade lasers (at ∼3.25 THz) monolithically into an array, a peak power of 213 mW is obtained at 10 K with a threshold current density of only 257 A/cm 2. The device shows distinct single-lobe far-field behaviour in the temperature range from 10 to 90 K, with a full-width at half-maximum of 36°. The highest operating temperature of the array laser is identical to that of the single ridge laser, indicating good heat dissipation design in the array. These results are promising for realising high power THz quantum cascade lasers.

show abstract

“…11,12 Recently, this technology has been demonstrated for QCLs by using an array of laser micro-stripes. 13,14 However, the experimental result reported so far indicated that the outof-phase operation is favored due to the reduced mode overlap between adjacent emitters and the additional propagation losses in the coupling region even though the geometrical array parameters have been adjusted as possible and gain of the active region is set high enough. 13 This out-of-phase mode of operation is not desirable in most cases since it gives a double-lobe far-field pattern with a large divergence angle.…”

mentioning

confidence: 99%