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Calculated QPM SHG period as a function of fundamental wavelength using the reported Sellmeier’s formulas (Ref. 16).
Periodic domain structure after etching: Grating vector is parallel to the axis (a), and to the axis (b) with period. Low magnification was used in (c) and (d) to show the uniformity.
Second-harmonic intensity vs fundamental wavelength (solid line is fitting curve).
(a) SH spectrum as a function of temperature with an input pulse of 95 fs at the fundamental wavelength centered at 1518 nm; (b) autocorrelation trace of SH pulse at both GVM and QPM condition. The FWHM of 158 fs was fitted value with assuming a Gaussian shape.
SH power vs input power at simultaneous QPM and GVM condition.
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