A. A. Belyanin

Nonlinear mode mixing in dual-wavelength semiconductor lasers with tunnel junctions

The authors demonstrate and study two- and three-wavelength generations in the semiconductor diode laser with a tunnel junction separating two different quantum-well active regions integrated within a single waveguide. To avoid resonant cross absorption of the modes at different frequencies and achieve phase matching, the laser waveguide is designed to generate the first-order transverse mode at a longer wavelength and the third-order mode at a shorter wavelength. Excellent agreement with the designed and measured device parameters is observed. Intracavity nonlinear mixing leading to sum-frequency and second-harmonic generation is demonstrated.

Renormalized energies of superfluorescent bursts from an electron-hole magnetoplasma with high gain in InxGa1−xAs quantum wells

(Received 23 May 2012; revised manuscript received 25 November 2012; published 8 January 2013)We study light emission properties of a population-inverted 2D electron-hole plasma in a quantizing magneticfield. We observe a series of superfluorescent (SF) bursts, discrete both in time and energy, corresponding tothe cooperative recombination of electron-hole pairs from different Landau levels. Emission energies exhibitstrong renormalization due to many-body interactions among the photogenerated carriers, showing pronouncedred shifts as large as 20 meV at 15 T. However, the lowest Landau level emission line remains stable againstrenormalization and show excitonic magnetic field dependence. Interestingly, our time-resolved measurementsshow that this lowest-energy SF burst occurs only after most upper states become empty, suggesting that thisexcitonic stability is related to the “hidden symmetry” of 2D magnetoexcitons expected in the magnetic quantumlimit.DOI: 10.1103/PhysRevB.87.045304 PACS number(s): 78

Surface-emitting THz sources based on difference-frequency generation in mid-infrared quantum cascade lasers

We report a surface-emitting THz source based on intracavity difference-frequency generation in dual-wavelength midinfrared quantum cascade lasers with integrated giant second-order nonlinear susceptibility. The THz light is coupled out of the waveguide by a second-order grating etched into the laser ridges. In contrast to sources where the difference-frequency radiation is emitted from the facet, this approach enables extraction of the THz emission from the whole length of the device even when the coherence length is small. We also studied the properties of the mid-infrared pump beams and found that due to gain competition, mid-infrared modes tend to start lasing in higher order lateral modes. The mid-infrared mode with the lower threshold current reduces population inversion for the second laser with the higher threshold current due to stimulated emission. We developed a rate equation model to quantitatively describe mode interactions due to mutual gain depletion.

Midinfrared third-harmonic generation from macroscopically aligned ultralong single-wall carbon nanotubes

We report the observation of strong third harmonic generation from a macroscopic array of aligned ultralong single-wall carbon nanotubes (SWCNTs) with intense midinfrared radiation. Through power-dependent experiments, we determined the absolute value of the third-order nonlinear optical susceptibility,

First experiments and prospects of intracavity difference -frequency generation of mid/far-infrared and terahertz radiation in diode lasers

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Terahertz generation via intracavity mixing in mode-locked dual-wavelength lasers

, of our SWCNT film to be 5.53

Intracavity nonlinear optics of semiconductor nanostructures and new mid/far-infrared laser schemes

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Optical mixing in GaAs/InGaAs/InGaP butt-joint diode lasers: new scheme for the sum- and difference-frequency generation

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Terahertz sources based on the intracavity wave mixing of self-generated fields in semiconductor lasers

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Two-color heterolasers as parametric generators of infrared radiation

esu, three orders of magnitude larger than that of the fused silica reference we used. Taking account of the filling factor of 8.75% for our SWCNT film, we estimate a