Fourier limit pulse train from an active mode-locked quantum-cascade laser (Conference Presentation)

Valentino Pistore; Hanond Nong; Pierre-Baptiste Vigneron; Raffaele Colombelli; Katia Garrasi; Miriam S. Vitiello; Lianhe H. Li; Edmund H. Linfield; Giles A. Davies; Juliette Mangeney; Jérome Tignon; Sukhdeep Dhillon

doi:10.1117/12.2507975

13 March 2019 Fourier limit pulse train from an active mode-locked quantum-cascade laser (Conference Presentation)

Valentino Pistore, Hanond Nong, Pierre-Baptiste Vigneron, Raffaele Colombelli, Katia Garrasi, Miriam S. Vitiello, Lianhe H. Li, Edmund H. Linfield, Giles A. Davies, Juliette Mangeney, Jérome Tignon, Sukhdeep Dhillon

Author Affiliations +

Proceedings Volume 10939, Novel In-Plane Semiconductor Lasers XVIII; 109391D (2019) https://doi.org/10.1117/12.2507975
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Recently, modelocked THz QCLs have been shown to generate 4ps pulses using monolithically integrated Gires-Tournois Interferometer (GTI) dispersion compensation schemes. However, Fourier limit pulse trains were not achieved to date that is vital to realize shorter pulses. Here we show a Fourier-limited pulse train of 3.4ps obtained from an active-modelocked QCL by exactly matching the spectral bandwidth to that of an appropriate GTI. This is despite a spectral bandwidth that is much lower than previous demonstrations. A QCL based on a multiple stack hybrid active region was used and processed into a metal/metal waveguide. The emission frequency is centred at 3THz with a free-running bandwidth of ~0.1THz. The GTI is fabricated by etching a sub-wavelength air gap through the active region at one end of the QCL ridge. Electromagnetic simulations were performed to optimize the GTI size resulting in a 66.2µm long GTI compensating for the dispersion over a range of 0.3THz around 3.15THz. The pulse measurements are based on coherent sampling of the electric-field using electro-optic detection. A stable 3.4ps pulse train was obtained by actively modelock the THz QCL with a microwave modulation. Each pulse shows a spectrum with 0.13THz FWHM, exactly at the Fourier-transform limit. In the frequency domain, lasing action occurs only at the off-resonance condition of the GTI as this appoints the dispersion compensated region as the most favourable range for modelocked emission. In this work we attained the Fourier transform limit permitting the shortest demonstrated stable pulse train from a modelocked THz QCL.

Conference Presentation

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Valentino Pistore, Hanond Nong, Pierre-Baptiste Vigneron, Raffaele Colombelli, Katia Garrasi, Miriam S. Vitiello, Lianhe H. Li, Edmund H. Linfield, Giles A. Davies, Juliette Mangeney, Jérome Tignon, and Sukhdeep Dhillon "Fourier limit pulse train from an active mode-locked quantum-cascade laser (Conference Presentation)", Proc. SPIE 10939, Novel In-Plane Semiconductor Lasers XVIII, 109391D (13 March 2019); https://doi.org/10.1117/12.2507975

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KEYWORDS

Quantum cascade lasers

Electro optical modeling

Dispersion

Terahertz radiation

Electro optics

Electromagnetic simulation

Etching

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