Flat broadband wavelength conversion based on cascaded second-harmonic generation and difference frequency generation in segmented quasi-phase matched gratings

Bandwidth enhancement and response flattening of wavelength conversion based on single-pass and double-pass cascaded second harmonic generation and difference frequency generation were investigated in segmented quasi-phase matched (QPM) gratings. It is shown that the signal and pump bandwidths are b...

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Bibliographic Details
Published in:Journal of modern optics 2012-04, Vol.59 (7), p.650-657
Main Authors: Liu, Tao, Qi, Yulin, Che, Linlin, Li, Baogang, Yu, Song, Gu, Wanyi
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
Broadband
Conversion
difference frequency generation
Diffraction gratings
Frequency distribution
Gratings (spectra)
Optics
Pumps
quasi-phase matching
Ripples
second harmonic generation
Segments
wavelength conversion
Wavelengths
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Summary:Bandwidth enhancement and response flattening of wavelength conversion based on single-pass and double-pass cascaded second harmonic generation and difference frequency generation were investigated in segmented quasi-phase matched (QPM) gratings. It is shown that the signal and pump bandwidths are both efficiently widened by increasing the segment number of the QPM grating and optimising the poling period of each segment. The ripple on the matching response is also very small. The conversion bandwidth in a 3-cm-long three-segment waveguide reaches 150-160 nm, which is over the whole conventional band and long-wavelength band. Larger signal bandwidth can be obtained with a little response flatness penalty and conversion efficiency penalty, which can be compensated by increasing the input pump power. Compared with a sinusoidally chirped optical superlattice device, a wavelength converter based on the segmented gratings has higher conversion efficiency, broader bandwidth and better pump-wavelength tolerance, and is easier to fabricate in practice.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2012.655790