A large wavelength tuning range MgO-doped Periodically Poled Lithium Niobate (PPLN) ridge waveguide is fabricated. Using the iterative domino algorithm, an engineered Quasi Phase Matching (QPM) structure has been implemented to the ridge waveguide, which forms seven wavelength conversion peaks. Each designed conversion peak has equally nonlinear strength and 5nm wavelength separation, locates from 1530 nm to 1560 nm at 40 deg. C. Combined with temperature adjustment between 15 to 60 deg. C, which could tune each phase matching peak for more than 5 nm, full C band tuning range is achieved with high conversion efficiency. Under CW 5.5W single frequency C band input, 3.7W is coupled to the waveguide, and 2.5W SHG is generated.
High-efficiency single-pass CW UV 355nm generation using PPLN has been studied under focusing optimization concept. Using a 25mm (1st order, SHG) PPLN crystal cascaded with a 10mm (3rd order, SFG) PPLN crystal and 3.8W 1064nm input pump, we have successfully generated >100mW CW 355nm output with good beam quality and power stability. As compared to previous publications and to other kind of nonlinear materials, maximum CW UV 355nm power generated from PPLN has been enhanced by a factor of 2~3, and the single pass conversion efficiency at 4W 1064nm input level has been enhanced by a factor of ~4.
We have developed the MgO: PPLN ridge waveguide modules for efficient second harmonic generation output and optical parametrical amplification at telecom wavelength. High efficient and high damage resistance of developed MgO: PPLN waveguide modules have enabled efficient optical parametric amplification with >16dB intrinsic gain for the input signal.
Thermal effect in high-power CW single-pass 1064 nm SHG for 532 nm generation using MgO:PPLN crystal has been theoretically and experimentally investigated. By careful control of the focusing condition to deal with the well-known thermal issue such as thermal lensing and dephasing in MgO:PPLN crystal, we have successfully generated >7W green output at 532nm using a 25mm long crystal without observing optical damage. This achievement has enhanced the maximum CW green power generated through MgO:PPLN crystal by a factor of 3 as compared to the common optimization under low power condition, and by a factor of 2 as compared to the scheme of single-pass multi-crystal cascading SHG. To our best knowledge, this result gives the highest CW green power via SHG of MgO:PPLN crystal. Furthermore, a systematic study for SHG optimization has shown that >30% SHG conversion efficiency can be achieved from 2W to 7W under output-power dependent optimization.
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