Photorefractive damage of LiNbO3 quasiphase matched wavelength converters

Photorefractive damage (PRD) of LiNbO3 quasiphase matched (QPM) wavelength converters is studied by a novel two-beam method, in which the second-harmonic generation (SHG) tuning curve of a broadband probe beam is monitored. The QPM condition and wavelength conversion efficiency, which are characterized by the peak wavelength and peak intensity of the SHG tuning curve respectively, are investigated in detail with respect to the irradiation power and irradiation time. It is found that the QPM condition and wavelength conversion efficiency change markedly even for low irradiation powers (<20 mW), indicating that the PRD effect is non-negligible in LiNbO3 QPM wavelength converters intended for practical applications.

[1]  Measurement of bulk photovoltaic and photorefractive characteristics of iron doped LiNbO3 , 1983 .

[2]  Hideaki Okayama,et al.  Optical frequency conversions in nonlinear medium with periodically modulated linear and nonlinear optical parameters , 1995 .

[3]  H J Shaw,et al.  Photorefractive-damage-resistant Zn-diffused waveguides in MgO:LiNbO(3). , 1991, Optics letters.

[4]  Hideaki Okayama,et al.  1.5 μm band efficient broadband wavelength conversion by difference frequency generation in a periodically domain‐inverted LiNbO3 channel waveguide , 1993 .

[5]  George I. Stegeman,et al.  Efficient wavelength shifting over the erbium amplifier bandwidth via cascaded second order processes in lithium niobate waveguides , 1997 .

[6]  Takumi Fujiwara,et al.  Photorefractive effect in Ti‐diffused channel waveguides using LiNbO3 substrates with reduced optical absorption , 1989 .

[7]  Masaki Saitoh,et al.  PHOTOREFRACTIVE DAMAGE IN LINBO3 THIN-FILM OPTICAL WAVEGUIDES GROWN BY LIQUID PHASE EPITAXY , 1994 .

[8]  P. J. Chandler,et al.  Photorefractive damage removal in annealed-proton-exchanged LiNbO3 channel waveguides , 1997 .

[9]  Martin Richardson,et al.  LASERS, OPTICS, AND OPTOELECTRONICS 1933 Temperature and polarization dependence of LiNbO3 quasiphase-matched wavelength converters , 1999 .

[10]  Kenji Kitamura,et al.  Photorefractive effect in LiNbO3 crystals enhanced by stoichiometry control , 1997 .

[11]  R. Ramaswamy,et al.  Comparison of photorefractive index change in proton-exchanged and Ti-diffused LiNbO(3) waveguides. , 1993, Optics letters.

[12]  Photorefractive nonlinearity of periodically poled ferroelectrics , 1997 .

[13]  H. Taylor,et al.  Comparison of photorefractive damage effects in LiNbO3, LiTaO3, and Ba1−xSrxTiyNb2−yO6 optical waveguides at 488 nm wavelength , 1997 .

[14]  M M Fejer,et al.  1.5-microm-band wavelength conversion based on difference-frequency generation in LiNbO3 waveguides with integrated coupling structures. , 1998, Optics letters.

[15]  C. Teng,et al.  Observation of the photorefractive effect in a dialkylaminonitrostilbene copolymer. , 1993, Optics letters.

[16]  M C Bashaw,et al.  Photorefractive effects in periodically poled ferroelectrics. , 1996, Optics letters.

[17]  A. M. Glass,et al.  The Photorefractive Effect , 1978 .

[18]  I P Kaminow,et al.  Absorption loss and photorefractive-index changes in Ti:LiNbO(3)crystals and waveguides. , 1980, Applied optics.