Abstract.
Experimental results are reported for the noise characteristics of an Yb-doped fibre amplifier pumped at 975 nm, used as a booster of a low-noise narrow-linewidth single-frequency 1083-nm wavelength laser diode. The maximum output power of the amplifier is 1.2 W with a gain larger than 30 dB. An increase of the intensity-noise spectral density relative to the signal, by approximately 6.5 dB, is introduced by the amplification process, due to signal-amplified spontaneous-emission (ASE) beat noise. A remarkable increase of the noise level with decreasing frequency is observed below ≈35 kHz, probably due to technical noise of the amplifier pump diodes. The spectral broadening due to amplifier phase noise was measured to be less than 300 Hz with a 5-kHz-linewidth Nd:YAG laser and that for the 300-kHz-linewidth diode laser at 1083 nm is therefore expected to be in the same range.
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Received: 5 October 1999 / Revised version: 2 December 1999 / Published online: 24 March 2000
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Cancio, P., Zeppini, P., De Natale, P. et al. Noise characteristics of a high-power ytterbium-doped fibre amplifier at 1083 nm . Appl Phys B 70, 763–768 (2000). https://doi.org/10.1007/s003400000241
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DOI: https://doi.org/10.1007/s003400000241