Abstract
Wavelength shift of modified second-harmonic bandwidth in a 20-mm-long engineered chirped periodically poled lithium niobate is experimentally demonstrated by focal-point displacement of a strongly focused pump beam of a 30- $\mu \text{m}$ beam waist. Utilizing this non-confocal arrangement in a cascaded second harmonic generation and difference frequency generation process, a CW probe as a signal wavelength is variably shifted within an 8-nm span by pump tuning using a $\sim 7$ -nm second-harmonic bandwidth.
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