Čerenkov Waveguide SHG: a Less Critical Way to Reach the Efficiency Peak

• Authors: L. Kotačka , J. Čtyroký , H. Hoekstra
• Languages of publication: EN

Abstracts

EN

It is well known that the conversion efficiency of the SHG in the Čerenkov regime in a waveguide with a nonlinear substrate exhibits a very sharp peak. Its position in a "pump wavelength-guide thickness" diagram follows a modified dispersion relation. A particular material combination exactly determines both the pump wavelength and the guide thickness. The existence of the peak was also experimentally proved with relatively high normalised conversion efficiency of 210%/(cm W). However, in order to achieve such a high conversion efficiency, the required tolerance in the guide thickness should be smaller than 0.5 nm (the FWHM of the peak is approximately 0.8 nm). The allowed variations in refractive indices are also very low (<10^{-3}). The recent theoretical study of the authors showed that an additional layer (idler) inserted into the waveguide facilitates more degrees of freedom which could relax the conditions for reaching the efficiency peak. This paper presents a detailed study of the behaviour of four-layer waveguide devices with a nonlinear substrate which promise a less constrained way to reach the efficiency peak.

Keywords

EN

42.65.Ky; 42.82.Et

Discipline

• 42.65.Ky: Frequency conversion; harmonic generation, including higher-order harmonic generation(see also 42.79.Nv Optical frequency converters)
• 42.82.Et: Waveguides, couplers, and arrays(for fiber waveguides, see 42.81.Qb)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 1
• Pages: 135-146

Dates

published

2001-01

received

2001-06-08

Contributors

author

L. Kotačka

• Institute of Radio Engineering and Electronics, Chaberská 57, 182 51 Praha 8, Czech Republic

author

J. Čtyroký

• Institute of Radio Engineering and Electronics, Chaberská 57, 182 51 Praha 8, Czech Republic

author

H. Hoekstra

• Light Device Group, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands

References

• 1. E.M. Conwell, IEEE J. Quantum Electron., QE-9, 867, 1973
• 2. A. Yariv, IEEE J. Quantum Electron., QE-9, 919, 1973
• 3. H. Tamada, IEEE J. Quantum Electron., 27, 502, 1991
• 4. J. Ctyroký, L. Kotacka, Opt. Quantum Electron., 32, 799, 2000
• 5. L. Kotacka, J. Ctyroký, submitted to Opt. Quantum Electron
• 6. N. Asai, H. Tamada, I. Fujiwara, J. Seto, J. Appl. Phys., 72, 4521, 1992
• 7. T. Doumuki, H. Tamada, M. Saitoh, Appl. Phys. Lett., 64, 3533, 1994
• 8. T. Doumuki, H. Tamada, M. Saitoh, Appl. Phys. Lett., 65, 2519, 1994
• 9. R.-S. Chang, R.-Y. Shaw, J. Mod. Opt., 45, 103, 1998
• 10. L. Kotacka, J. Ctyroký, H.J.W.M. Hoekstra, in: Non-linear Guided Waves and Their Applications, OSA Tech. Digest, Dijon 1999, OSA, Washington D.C. 1999, p. 380
• 11. C. Tsao, Optical Fibre Waveguide Analysis, Oxford University Press, Oxford 1992
• 12. M. Born, E. Wolf, Principles of Optics, 6th ed., Pergamon Press, Oxford 1993

Identifiers

DOI

10.12693/APhysPolA.99.135