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MIXSEL (Modelocked Integrated eXternal-cavity Surface Emitting Lasers)

Titre du projet
MIXSEL (Modelocked Integrated eXternal-cavity Surface Emitting Lasers)
Description
Within this project, we proposed to demonstrate optically and electrically pumped MIXSELs (OP-MIXSELs and EP-MIXSELs) in both the pico- and femtosecond regime. Picosecond MIXSELs are ideally suited for clocking applications whereas femtosecond MIXSELs are required for continuum generation and many biomedical applications. For both cases average powers of >100 mW with electrical pumping and >500 mW with optically pumping need to be demonstrated. Saturable absorbers need to be optimized for integration into a MIXSEL and further developed for femtosecond pulse generation. We will mostly rely on quantum dot saturable absorbers and will explore the different trade-offs of quantum well versus quantum dot gain sections. We will perform a systematic design optimization of MIXSELs backed by numerical simulations. A drift-diffusion model can be used for the carrier transport and a transfer matrix method for optical simulation. These models will be extended with electro-optical and electro-opto-thermal simulations. Supercontinuum generation will be initially investigated with femtosecond diode-pumped solid-state lasers and then compared to the newly developed femtosecond MIXSELs.
We overachieved many of our target goals by far with high power ps OP-MIXSEL, 1 W fs OP-VECSEL and recently with the first fs OP-MIXSEL. Electrical pumping is still very challenging, more than initially anticipated, but we significantly improved our design leading to record short pulses from this type of modelocked lasers.
Chercheur principal
Statut
Completed
Date de début
1 Juin 2009
Date de fin
31 Mai 2013
Chercheurs
Keller, Ursula
Kapon, Eli
Witzigmann, Bernd
Organisations
Identifiant interne
21637
identifiant
https://libra.unine.ch/handle/123456789/1614
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  • Publication
    Accès libre
    Noise properties of an optical frequency comb from a SESAM-modelocked 1.5 µm solid-state laser stabilized to the 10E-13 level
    (2012-5-26)
    Schilt, Stephane 
    ;
    Dolgovskiy, Vladimir 
    ;
    Bucalovic, Nikola 
    ;
    Schori, Christian 
    ;
    Stumpf, Max
    ;
    Di Domenico, Gianni 
    ;
    Pekarek, Selina
    ;
    Oehler, Andreas
    ;
    Südmeyer, Thomas 
    ;
    Keller, Ursula
    ;
    Thomann, Pierre 
    We present a detailed investigation of the noise properties of an optical frequency comb generated from a femtosecond diode-pumped solid-state laser operating in the 1.5-μm spectral region. The stabilization of the passively mode-locked Er:Yb:glass laser oscillator, referred to as ERGO, is achieved using pump power modulation for the control of the carrier envelope offset (CEO) frequency and by adjusting the laser cavity length for the control of the repetition rate. The stability and the noise of the ERGO comb are characterized in free-running and in phase-locked operation by measuring the noise properties of the CEO, of the repetition rate, and of a comb line at 1558 nm. The comb line is analyzed from the heterodyne beat signal with a cavity-stabilized ultra-narrow-linewidth laser using a frequency discriminator. Two different schemes to stabilize the comb to a radio-frequency (RF) reference are compared. The comb properties (phase noise, frequency stability) are limited in both cases by the RF oscillator used to stabilize the repetition rate, while the contribution of the CEO is negligible at all Fourier frequencies, as a consequence of the low-noise characteristics of the CEO-beat. A linewidth of ≈150 kHz and a fractional frequency instability of 4.2×1E−13 at 1 s are obtained for an optical comb line at 1558 nm. Improved performance is obtained by stabilizing the comb to an optical reference, which is a cavity-stabilized ultra-narrow linewidth laser at 1558 nm. The fractional frequency stability of 8×1E−14 at 1 s, measured in preliminary experiments, is limited by the reference oscillator used in the frequency comparison.