Abstract
This paper describes recent progress at BTLabs in high gain high output power praseodymium doped fluoride fiber amplifiers around 1.3 micrometers . Firstly, results using Ti:sapphire pumping will be described; using a high numerical aperture fiber, a net gain of 15 dB was achieved for 200 mW pump power, with a maximum small signal net gain of 29.5 dB. When operated as a power amplifier > 200 mW output power was obtained, with a 30% slope efficiency. This represents the first achievement of efficient operation in both small and large signal regimes. In a separate experiment, a diode-pumped Nd:YLF laser was used to pump a medium numerical aperture fiber. 29.5 dB small signal gain was again achieved, with a saturated output of 250 mW when operated as a power amplifier. We believe that this represents the highest amplified output from such an amplifier, irrespective of pump power. Additional details of the spectral performance of the two amplifiers will be given, for both small signal and large signal operation.
Published Version
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