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Titolo: Frequency doubling in LiNbO3 using temperaturedependent QPM
Autore: Belmonte, M; Skettrup, T; Pedersen, C;
 Indirizzi:
 Tech Univ Denmark, Inst Phys, DK2800 Lyngby, Denmark Tech Univ Denmark Lyngby Denmark DK2800 t Phys, DK2800 Lyngby, Denmark Nordic Laser Syst AS, DK3490 Kvistgaard, Denmark Nordic Laser Syst AS Kvistgaard Denmark DK3490 3490 Kvistgaard, Denmark
 Titolo Testata:
 JOURNAL OF OPTICS APURE AND APPLIED OPTICS
fascicolo: 1,
volume: 1,
anno: 1999,
pagine: 60  63
 SICI:
 14644258(199901)1:1<60:FDILUT>2.0.ZU;2K
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 GENERATION;
 Keywords:
 frequency doubling; periodically poled LiNbO3; QPM (quasiphase matching); temperature tuning;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Engineering, Computing & Technology
 discip_EC
 Citazioni:
 6
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Belmonte, M Tech Univ Denmark, Inst Phys, DK2800 Lyngby, Denmark Tech Univ Denmark Lyngby Denmark DK2800 800 Lyngby, Denmark



 Citazione:
 M. Belmonte et al., "Frequency doubling in LiNbO3 using temperaturedependent QPM", J OPT AP A, 1(1), 1999, pp. 6063
Abstract
We report the application of temperaturedependent quasiphase matching (QPM) for second harmonic. generation of green light using periodically fieldpoled LiNbO3. In contrast to the usual QPM devices, here the fundamental and second harmonic waves are polarized orthogonally so that the second harmonic signal corresponds to the extraordinary wave. This requires the utilization of the d(31) component of the nonlinear tensor (i.e. the same component as used for ordinary birefringent phase: matching). d(31) is smaller than the d(33) component usually used in QPM devices and therefore yields a lower efficiency. However, the use of QPM in our geometry with orthogonally polarized waves results in a greatly enhanced temperature tunability, which increases the versatility of the devices. Moreover, the domain inversion grating period required in this geometry for firstorder QPM at the Nd laser wavelength 1064 nm and room temperature is relatively large (350 mu m), and therefore easier to fabricate. Compared with birefringent phase matching, the QPM technique allows for phase matching at anywavelength and eliminates the walkoff effect since the fields propagates along one of the dielectric principal axes. The interaction path can therefore, in principle, be extended over arbitrarily long distances.
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Documento generato il 28/11/20 alle ore 04:19:23