Dynamical interplay between ground and excited states in quantum dot laser

G.S. Sokolovskii, V.V. Dudelev, E.D. Kolykhalova, A.G. Deryagin, A. Bakoz, I.I. Novikov, M.V. Maximov, A.E. Zhukov, V.M. Ustinov, V.I. Kuchinskii, W. Sibbett, E.U. Rafailov, E.A. Viktorov, T. Erneux

Research output: Chapter in Book/Report/Conference proceedingConference publication

Abstract

Full text:

Semiconductor quantum dot lasers are attractive for multipletechnological applications in biophotonics. Simultaneous two-state lasing ofground state (GS) and excited state (ES) electrons and holes in QD lasers ispossible under a certain parameter range. It has already been investigated in steady-stateoperations and in dynamical regimes and is currently a subject of the intesiveresearch.

It has been shown that the relaxation frequency in the two-state lasingregime is not a function of the total intensity [1], as could be traditionallyexpected.In this work we study damping relaxation oscillations in QD lasersimultaneously operating at two transitions, and find that under variouspumping conditions, the frequency of oscillations may decrease, increase orstay without change in time as shown in Fig1.The studied QD laser structure wasgrown on a GaAs substrate by molecular-beam epitaxy. The active region includedfive layers of self-assembled InAs QDs separated with a GaAs spacer from a5.3nm thick covering layer of InGaAs and processed into 4mm-wide mesa stripe devices. The 2.5mm long lasers withhigh-and antireflection coatings on the rear and front facets lasesimultaneously at the GS (around 1265nm) and ES (around 1190nm) in the wholerange of pumping. Pulsed electrical pumping obtained from a high power (up to2A current) pulse source was used to achieve high output power operation.

We simultaneously detect the total output and merely ES output using aBragg filter transmitting the short-wavelength and reflecting the long-wavelengthradiation. Typical QD does not demonstrate relaxation oscillations frequencybecause of the strong damping [2]. It is confirmed for the low (I<0.68A) andhigh (I>1.2 A) range of the pump currents in our experiments. The situationis different for a short range of the medium currents (0.68A<I<1.2A) asthe large scale amplitude oscillations appear after the laser turns on andstarts to operate simultaneously. The frequency of oscillations may either significantlydecrease (from 2 GHz to 1 GHz) or sufficiently increase (from 2 GHz to 4 GHz)within 20 ns of the pulse duration. The oscilations appear simultaneously at GSand ES and are always damped, but can be either inphase or antiphase dependingon the pump current and temperature conditions.

We address the excitation of the relaxation oscillations to non-instantaneousturn on of the pumping source which activates with 5ns rise time and discussthe swap of the oscillation's frequency in time to spectral shifts caused by thermaleffects.

[1] M.Abusaa, J. Danckaert, E. A. Viktorov, and T. Erneux, Phys. Rev. A 87, 063827(2013).

[2] T.Erneux, E. A. Viktorov, and P. Mandel, Phys. Rev. A 76,023819 (2007). 1

Original languageEnglish
Title of host publicationProceedings : 2014 international conference Laser Optics
Place of PublicationPiscataway, NJ (US)
PublisherIEEE
Number of pages1
ISBN (Electronic)978-1-4799-3885-8
ISBN (Print)978-1-4799-3884-1
DOIs
Publication statusPublished - 31 Dec 2014
Event2014 international conference Laser Optics - St. Petersburg, Russian Federation
Duration: 30 Jun 20144 Jul 2014

Conference

Conference2014 international conference Laser Optics
Abbreviated titleLO 2014
CountryRussian Federation
CitySt. Petersburg
Period30/06/144/07/14

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  • Research Output

    • 3 Conference publication

    73 nm wavelength tuning from a frequency-doubled quantum-dot laser in PPKTP waveguides

    Fedorova, K. A., Sokolovskii, G. S., Battle, P. R., Livshits, D. A. & Rafailov, E. U., 31 Dec 2014, Proceedings : 2014 international conference Laser Optics. Piscataway, NJ (US): IEEE, 1 p.

    Research output: Chapter in Book/Report/Conference proceedingConference publication

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    Research output: Chapter in Book/Report/Conference proceedingConference publication

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    Research output: Chapter in Book/Report/Conference proceedingConference publication

  • Cite this

    Sokolovskii, G. S., Dudelev, V. V., Kolykhalova, E. D., Deryagin, A. G., Bakoz, A., Novikov, I. I., Maximov, M. V., Zhukov, A. E., Ustinov, V. M., Kuchinskii, V. I., Sibbett, W., Rafailov, E. U., Viktorov, E. A., & Erneux, T. (2014). Dynamical interplay between ground and excited states in quantum dot laser. In Proceedings : 2014 international conference Laser Optics IEEE. https://doi.org/10.1109/LO.2014.6886283