New generation in nonlinear optical device
Sunao KURIMURA*, **
* National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan ** Waseda University, Tokyo 169-8555, Japan
E-mail: [email protected]
New generations by quasi-phase matching (QPM) technology are emerging in nonlinear optical (NLO) devices, together with the development of materials. Designed domain patterns realize the extension of wavelength range from fixed wavelengths, allowing energy and phase control of coherent light. This talk reviews bulk- and waveguide-type NLO devices (Fig.1), accompanied by introduction of cutting-edge applications.
Bulk devices for visible light generation and waveguide devices for telecom applications, based on NLO crystals Mg:LiNbO3 (Mg:LN) and Mg: stoichiometric
LiTaO3 (Mg:SLT), demonstrated dramatic progress these years. Recent achievements
include continuous-wave 16W output power in single-pass green light generation1) and 575% conversion efficiency in telecom wavelength conversion2). Green light generators have been installed into laser display system, and efficient waveguides with a unique structure (ARW) 3), opened new functions in high-speed optical communication4) and quantum optical applications5). Other novel devices/materials will be introduced in the conference. These works are partially supported by The Ministry of Education, Culture, Sports, Science and Technology for Grant-in-Aid for Scientific Research 19340085 and 20244062.
1. S.V. Tovstonog, S. Kurimura, I. Suzuki, K. Takeno, S. Moriwaki, N. Ohmae, N. Mio, and T. Katagai, "Thermal effects in high-power CW second harmonic generation in Mg-doped stoichiometric lithium tantalate", Opt. Exp. 16, 11294 (2008).
2. K. Kikuchi, S. Kurimura, R. Kou, A.Terasaki, H. Nakajima, K. Kondou, J. Ichikawa, “Highly efficient wavelength conversion in quasi-phase-matched adhered ridge waveguide”, in Proceedings of CLEO Pacific Rim 2009, TuP5-04.
3. S. Kurimura, Y. Kato, M. Maruyama, Y. Usui, and H. Nakajima, "Quasi-phase-matched adhered ridge waveguide in LiNbO₃", Appl. Phys. Lett. 89, 191123 (2006).
4. L.K. Oxenløwe, F. Gomez Agis, C. Ware, S. Kurimura, H.C.H. Mulvad, M. Galili, K. Kitamura, H. Nakajima, J. Ichikawa, D. Erasme, A.T. Clausen, and P. Jeppesen, "640
Gbit/s clock recovery using periodically poled lithium niobate", Electron. Lett. 44,370 (2008).
5. G. Fujii, N. Namekata, M. Motoya, S. Kurimura, S. Inoue, "Bright narrowband source of photon pairs at optical telecommunication wavelengths using a type-II periodically poled lithium niobate waveguide", Opt. Exp. 15, 12769 (2007).
FIG. 1 (a) Bulk and (b) waveguide-type NLO devices with QPM technology. Periodic
polarization-reversed structure realizes artificial phase matching at desired wavelength. Device (a) corresponds to green light generator from infrared laser and (b) channel converter from telecommunication C band to L band (pump light required).
FIG. 2 (a) Input and output characteristic in green light generation with Nd:YAG laser and bulk
Mg:SLT QPM device. High output power 16 W was achieved with 1cm-long device. (b) Input and output spectrums in Mg:LN adhered-ridge-waveguide (ARW) converter. Input light (left peak on green line) was converted into the output spectrum (right peak on pink line) with an efficiency of +7.6dB (575%). Input light is amplified with 9.5dB gain.
Keywords: nonlinear optics, polarization reversal, quasi-phase matching
a) b)
