A novel measuring implementation of femtosecond pulse amplitude and phase based on frequency-resolved optical gating

Chunping Liu; Shuang-chen Ruan; Chengxiang Liu; Jinhua Long

doi:10.1117/12.574374

31 January 2005 A novel measuring implementation of femtosecond pulse amplitude and phase based on frequency-resolved optical gating

Chunping Liu, Shuang-chen Ruan, Chengxiang Liu, Jinhua Long

Author Affiliations +

Proceedings Volume 5624, Semiconductor and Organic Optoelectronic Materials and Devices; (2005) https://doi.org/10.1117/12.574374
Event: Asia-Pacific Optical Communications, 2004, Beijing, China

Abstract

A novel measuring implementation based on second-harmonic generation frequency-resolved optical gating (SHG-FROG) has been presented. Both the intensity and phase of arbitrary-shaped ultra-short laser pulses can be got. According to SHG-FROG, the femtosecond pulse produced by a laser resource is split into two beams which variable time delay one another is controlled by a stepped electromotor. The second-harmonic signal field is generated by focusing these two beams to a 100um BBO crystal. Changing the delay from 0 to N (N is the samples number of time domain or frequency domain) delay units, the two-dimensional spectrum data of the second-harmonic signal field are acquired by PC2000-ISA card spectrometer and OOIwinIP of Ocean Optics. These data are provided to a pulse amplitude and phase retrieval algorithm to retrieve the parameters of the pulse. An experimental system is erected and the all software modules, including spectrum data acquiring, pulse retrieving and displaying, are based on Labwindows/CVI of National Instrument Corp. The stepped electromotor is driven by the commands coming from RS-232 interface. The results show that after 50 times iterations or so, the iterative error of the algorithm can be reduced to an enough small value and then the pulse amplitude, phase and other parameters are the desired parameters. The whole measuring process can be finished in 2~3 seconds while the spectrum data is a 64x64 matrix and the iterative times are set to 50.

Citation Download Citation

Chunping Liu, Shuang-chen Ruan, Chengxiang Liu, and Jinhua Long "A novel measuring implementation of femtosecond pulse amplitude and phase based on frequency-resolved optical gating", Proc. SPIE 5624, Semiconductor and Organic Optoelectronic Materials and Devices, (31 January 2005); https://doi.org/10.1117/12.574374

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