Optoelectronic feedback loop for relaxation oscillation intensitynoise suppression in Tm-Ho:YAG laser |
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| Authors: | Svelto C Taccheo S Marano M Sorbello G Laporta P |
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| Affiliation: | Dipt. di Elettronica e Inf., Politecnico di Milano ; |
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| 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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