NDLI: Experimental verification of femtosecond transverse mode conversion induced by non-permanently written long-period gratings

Content Provider	IEEE Xplore Digital Library
Author	Walbaum, T. Schnack, M. Hellwig, T. Fallnich, C.
Copyright Year	2013
Description	Author affiliation: Inst. fur Angewandte Phys., Westfalische Wilhelms-Univ., Munster, Germany (Walbaum, T.; Schnack, M.; Hellwig, T.; Fallnich, C.)
Abstract	Summary form only given. Mode conversion in few-mode fibers has been excessively studied and utilized, e.g., for dispersion compensation. For this purpose long-period gratings (LPG) have been permanently written into a fiber using UV or pulsed radiation. Recently, mode conversion has been demonstrated by transiently writing the grating structure into the fiber core via the optical Kerr effect with counter-propagating high power nanosecond pulses. An energy transfer between two probe modes with an efficiency of about 50% could be measured, limited by the damage threshold of the fiber front facet. A femtosecond laser source offers the possibility to reach the necessary peak powers at by a factor of 1000 reduced pulse energy. Therefore, we demonstrate the use of femtosecond pulses for writing optically induced long-period gratings (OLPG) to convert energy from one transverse probe mode to another. Due to the short interaction length of counter-propagating femtosecond pulses, our approach is changed to a co-propagating one, compared to our earlier work, using polarization to distinguish between probe and write beam.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	384373
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6800896
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber polarization Optical fiber amplifiers Fiber gratings Laser beams Ultrafast optics Probes Optical fiber dispersion
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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