Cerenkov-type second-harmonic generation in KNbO{sub 3} channel waveguides
- Swiss Federal Inst. of Tech., Zuerich (Switzerland)
- Forschungszentrum Juelich (Germany). Inst. fuer Schicht und Ionentechnik
Cerenkov-type second-harmonic generation using KNbO{sub 3} channel waveguides produced by MeV He{sup +}-ion implantation is presented from the viewpoint of device design. They derive the Cerenkov phase-matching condition for multimode waveguides and utilize Cerenkov-angle analysis as a tool for contact-free measurement of the effective indexes of guided modes of ion-implanted KNbO{sub 3} channel waveguides at a wavelength of 860 nm. The measured mode indexes are in full agreement with calculations based on the effective-index method and the refractive index-depth profiles of ion-implanted KNbO{sub 3} waveguides. The efficiency of Cerenkov-type second-harmonic generation is modeled using analytical approximations of the field distributions of the fundamental and the Cerenkov-radiation modes in embedded-channel waveguides. The acceptance width for Cerenkov-type frequency doubling in these ion-implanted waveguides is about one order of magnitude wider than for noncritical phase-matched second-harmonic generation in bulk KNbO{sub 3} crystals. Based on the theoretical simulations, guidelines for optimum device design are given, and the possibility to increase the ultimate conversion efficiency to about 30% W{sup {minus}1} cm{sup {minus}1} through lateral-resonance enhancement of the second-harmonic field in KNbO{sub 3} channel waveguides is demonstrated.
- OSTI ID:
- 253678
- Journal Information:
- IEEE Journal of Quantum Electronics, Journal Name: IEEE Journal of Quantum Electronics Journal Issue: 6 Vol. 32; ISSN 0018-9197; ISSN IEJQA7
- Country of Publication:
- United States
- Language:
- English
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