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Band structure of Si in the and directions. Arrows indicate possible OPA and TPA of photons. arrow 1: the OPA, arrow 2: the stepwise TPA, and arrow 3: the simultaneous TPA.
Experimental and fitting results at , with peak power of the pulse of .
Results under much stronger light condition, with peak power of at .
Experimental results at different peak powers and the linear fitting line from the origin at .
Optical coefficients at different temperatures for lights at and . The temperature for every coefficient value is shown in parentheses ( the OPA coefficient and the TPA coefficient).
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