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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CJ_P31

Concentration effects in Ho-doped fiber lasers

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Abstract

Ho-doped fiber lasers exhibit oscillations at the wavelengths above 2 pm [1,2] and can be interesting for medical applications due to the high absorption of tissue and laser location due to the high atmosphere transparency in a range of 2 .1-2.2 pm . In this spectral range there is a sharp growth of optical loss in silica glasses due to an influence of the molecular vibration lasers based on silica based fiber . Therefore to achieve the high lasing efficiency a length of the cavity should be not longer than several meters . It means that Ho-ions concentration should be high enough to provide an efficient oscillation using a short active fiber piece . On the other hand an increase of the active ions concentration can lead to the ions clustering . This effect can decrease the lasing efficiency and cause the laser self-pulsing due to the fast relaxation of the ions in clusters to the ground level . In this paper we study the lasing efficiency and dynamic properties of Ho-doped lasers based on the active fibers with different Ho-ions concentration.

© 2011 Optical Society of America

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