Archivio Istituzionale della RicercaAn optoelectronic feedback loop that can be used to effectively reduce the intensity noise of a 2.1 μm Tm-Ho:YAG laser has been designed. The feedback circuit is based on a variable-gain biquadratic bandpass filter with adjustable central frequency and quality factor, providing a high loop gain around the relaxation oscillation frequency of the laser and a closed-loop phase margin larger than 50°. The relaxation oscillation peak in the intensity noise spectrum was completely suppressed in closed-loop operation and a noise reduction of up to 24 dB was obtained.
Optoelectronic feedback loop for relaxation oscillation intensity noise suppression in Tm-Ho:YAG laser / Svelto, C.; Taccheo, S.; Marano, M.; Sorbello, G.; Laporta, P.. - In: ELECTRONICS LETTERS. - ISSN 0013-5194. - STAMPA. - 36:19(2000), pp. 1623-1624. [10.1049/el:20001179]
Optoelectronic feedback loop for relaxation oscillation intensity noise suppression in Tm-Ho:YAG laser
Taccheo S.;
2000
Abstract
An optoelectronic feedback loop that can be used to effectively reduce the intensity noise of a 2.1 μm Tm-Ho:YAG laser has been designed. The feedback circuit is based on a variable-gain biquadratic bandpass filter with adjustable central frequency and quality factor, providing a high loop gain around the relaxation oscillation frequency of the laser and a closed-loop phase margin larger than 50°. The relaxation oscillation peak in the intensity noise spectrum was completely suppressed in closed-loop operation and a noise reduction of up to 24 dB was obtained.
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https://hdl.handle.net/11583/2867158