19 February 2009 High core and cladding isolation termination for high-power lasers and amplifiers
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Abstract
As overall power increases in fiber lasers and amplifiers, the amount of optical power which must be dealt with in order to obtain high core to core and core to cladding isolation also increases. This unwanted light can represent hundreds of watts and must be managed adequately. By combining a proper termination (end cap) design and cladding stripping techniques it is possible to obtain a robust output beam delivery component. The cladding stripping techniques are inspired by previous work done on high power cladding strippers. All measurement presented here are done with a flat end cap. Both core to core and core to cladding isolation will be better with an angled end cap. A core-to-core isolation of over 25dB was measured, while core to cladding was over 30dB. Power handling was characterized by the capability of the device to handle optical power loss, rather than transmitted power. The component dissipated over 50 watts of optical power due to isolation. The above results show that understanding the mechanisms of optical loss for forward and backward propagating light in a end cap and the heat load that these losses generate is the key to deliver kilowatts of optical power and protect the integrity of the system.
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Alexandre Wetter, Alexandre Wetter, Mathieu Faucher, Mathieu Faucher, Benoit Sévigny, Benoit Sévigny, Nelson Vachon, Nelson Vachon, } "High core and cladding isolation termination for high-power lasers and amplifiers", Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 719521 (19 February 2009); doi: 10.1117/12.806923; https://doi.org/10.1117/12.806923
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