Measurement of Ultra-short Pulse-width by Using Noncollinear Sum-Frequency Generation

The third-order correlation function G⁽³⁾ (0, T ) can be measured by using the method of noncollinear sum-frequency, by which the pulse-width of the ultr-ashort pulse light produced by modelocked laser is deduced to be 35ps. This result is the same as that by other standrd method.