**Section 5**

**Time and Relativity** 

362 Modern Metrology Concerns

measurement result can self-calibrate with the two correlation traces. The autocorrelator is suitable for the measurement of ultrashort optical pulses from sub-10 fs to several hundred picoseconds, and it is useful in generation and characterization of both solid ultrashort pulse

This work was supported in part by the National Science and Technology Supporting Program of China (grant 2006BAF06B05), Basic Research Foundation of National Institute of

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**5. Acknowledgment** 

**6. References** 
