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Gigahertz frequency comb from a diode-pumped solid-state laser
Auteur(s)
Klenner, Alexander
Keller, Ursula
In
Optics Express, Optical Society of America, 2014/22/25/31008-31019
Résumé
We present the first stabilization of the frequency comb offset from a diode-pumped gigahertz solid-state laser oscillator. No additional external amplification and/or compression of the output pulses is required. The laser is reliably modelocked using a SESAM and is based on a diode-pumped Yb:CALGO gain crystal. It generates 1.7-W average output power and pulse durations as short as 64 fs at a pulse repetition rate of 1 GHz. We generate an octave-spanning supercontinuum in a highly nonlinear fiber and use the standard <i>ƒ</i>-to-2<i>ƒ</i> carrier-envelope offset (CEO) frequency <i>ƒ</i><sub>CEO</sub> detection method. As a pump source, we use a reliable and cost-efficient commercial diode laser. Its multi-spatial-mode beam profile leads to a relatively broad frequency comb offset beat signal, which nevertheless can be phase-locked by feedback to its current. Using improved electronics, we reached a feedback-loop-bandwidth of up to 300 kHz. A combination of digital and analog electronics is used to achieve a tight phase-lock of <i>ƒ</i><sub>CEO</sub> to an external microwave reference with a low in-loop residual integrated phase-noise of 744 mrad in an integration bandwidth of [1 Hz, 5 MHz]. An analysis of the laser noise and response functions is presented which gives detailed insights into the CEO stabilization of this frequency comb.
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Type de publication
journal article
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