Abstract
Laser development in 1.5-1.6-μm range is mostly based on Er3+-doped laser materials [1]. Er3+-doped laser materials are amenable to operating in the “low quantum defect (QD)” mode. Laser operation with the quantum defect of less than 1.5% has been recently reported for Er3+-doped scandia laser ceramic operated in a cryogenically-cooled mode [2]. Despite all these “pros”, Er3+-doped laser operation is known to be heavily affected by detrimental up-conversion effects, which confines laser designer to using low-concentrated gain elements, thus significantly limiting design space [1]. Er3+-doped crystalline laser materials also have extremely narrow absorption features, which calls for an in-band pumping by spectrally-narrowed sources. These two “contras” of Er3+-doped materials, along with the need for new materials amenable to “ultra-low” quantum defect operation, motivate the search for alternative, non-Er3+, laser materials capable of resonantly-pumped ~1.5-μm laser operation.
© 2009 IEEE
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