| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 105 === This thesis is a study based on quasi-phase-matching frequency conversion in nonlinear optics. We fabricate periodically poled structures on 0.75mm thick congruent lithium tantalite(CLT) substrates to realize the condition of quasi-phase-matching (QPM) for frequency conversion.
There are two QPM patterns cascadedon the CLT substrate of the structure on LT substrate at a crystal length of 20mm. The fist part in the above device is a 10mm-long PPLT structure for the optical parametric oscillation (OPO). It converts a 532nm pump green laser into a signal 1300nm wavelength and a idler 900nm wavelength. The second part contains the PPLT parallel three sets of structures of 10 mm length for the second-harmonic generation(SHG) and sum-frequency generation(SFG). It is designed for converting the 1300nm and 900nm wavelength into 650nm and 450nm SHG separately. And others, it is for combinig the 1300nm and the 1064nm into 585nm by the SFG process.
After optical measurement, the CIE coordinates of the white laser is (0.3626,0.3547,0.2827). And, The correlated color temperature (CCT) is 4835K.
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