Title :
Flat broad-band wavelength conversion based on sinusoidally chirped optical superlattices in lithium niobate
Author :
Shiming Gao ; Changxi Yang ; Guofan Jin
Author_Institution :
State Key Lab. of Precision Meas. Technol. & Instrum., Tsinghua Univ., Beijing, China
Abstract :
We report the enhancement of the bandwidth and the response flatness of wavelength conversion through cascaded second-order nonlinear processes by sinusoidally chirped optical superlattices (SCOSs) in lithium niobate crystal. The conversion bandwidth of the SCOS is significantly larger than that of uniform and segmented gratings. The SCOS shows very flat conversion response in the 1.5-μm region. The physical origin of the bandwidth enhancement is ascribed to the plentiful reciprocal wave vectors of the SCOS, which provide enough momenta to simultaneously satisfy quasi-phase matching conditions for both second-harmonic generation and difference-frequency generation.
Keywords :
lithium compounds; optical harmonic generation; optical materials; optical multilayers; optical phase matching; optical wavelength conversion; superlattices; 1.5 mum; 1.5-/spl mu/m region; LiNbO/sub 3/; bandwidth enhancement; cascaded second-order nonlinear processes; conversion bandwidth; difference frequency generation; flat broadband wavelength conversion; flat conversion response; gratings; lithium niobate crystal; quasi-phase matching conditions; reciprocal wave vectors; response flatness; second harmonic generation; sinusoidally chirped optical superlattices; Bandwidth; Chirp; Frequency conversion; Gratings; Lithium niobate; Optical harmonic generation; Optical pumping; Optical superlattices; Optical waveguides; Optical wavelength conversion;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.823102
