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Efficient second harmonic generation by birefringent phase matching in femtosecond‐laser‐inscribed KTP cladding waveguides
Author(s) -
Dong Ningning,
Chen Feng,
Vázquez de Aldana J. R.
Publication year - 2012
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201206224
Subject(s) - cladding (metalworking) , femtosecond , materials science , birefringence , optics , second harmonic generation , laser , optoelectronics , nonlinear optics , physics , metallurgy
We report on the fabrication of nonlinear KTiOPO 4 (KTP) cladding waveguides by using femtosecond‐laser direct inscription. The produced guiding structures with a circular cross section of ∼100 μm diameter support good light confinement both for the visible and infrared, for TE and TM polarization. Under the 1064 nm pulsed fundamental pump beam, guided‐wave second harmonic generation (SHG) at 532 nm has been realized with an optical conversion efficiency as high as 45.6% (∼0.076% W –1 cm –2 ), which is three times the magnitude of the normalized efficiency obtained for “double‐line” KTP waveguides (fabricated with the aim of comparison), thus showing an intriguing potential as integrated frequency converters. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)