Raman gain from waveguides inscribed in KGd(WO₄)₂ by high repetition rate femtosecond laser
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Eaton, S. M.
Merchant, C. A.
Iyer, R.
Zilkie, A. J.
Helmy, A. S.
Aitchison, J. S.
Herman, P. R.
Kraemer, D.
Miller, R. J. D.
Hnatovsky, C.
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American Institute of Physics
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We report the formation of waveguides in Raman-active KGd(WO₄)₂ with a focused, high repetition rate femtosecond laser. Parallel guiding regions, formed to either side of the laser-induced damage track, supported TE and TM modes that coupled efficiently to optical fiber at telecom wavelengths. Micro-Raman spectroscopy of the guiding regions revealed the preservation of the characteristic 768 and 901cm¯¹ Raman mode intensities. Raman gain with 6% efficiency was demonstrated for the 768cm¯¹ Raman line by pumping the waveguide with an infrared 80ps source, the first time Raman gain has been reported in laser formed waveguides.
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Applied Physics Letters
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