Simultaneously frequency down-conversion, independent multichannel phase shifting and zero-IF receiving using a phase modulator in a sagnac loop and balanced detection

2018 ◽  
Vol 410 ◽  
pp. 389-395 ◽  
Author(s):  
Zihang Zhu ◽  
Shanghong Zhao ◽  
Xuan Li ◽  
Tao Lin ◽  
Dapeng Hu
Keyword(s):  
Phase Shifting ◽  
Phase Modulator ◽  
Balanced Detection ◽  
Down Conversion

scholarly journals Accurate reconstruction of electric field of ultrashort laser pulse with complete two-step phase-shifting

2019 ◽  
Vol 7 ◽  
Author(s):  
Yi Cai ◽  
Zhenkuan Chen ◽  
Shuiqin Zheng ◽  
Qinggang Lin ◽  
Xuanke Zeng ◽  
...  
Keyword(s):  
Electric Field ◽  
Signal To Noise Ratio ◽  
Spectral Width ◽  
Phase Shifting ◽  
Optical Fields ◽  
Optical Components ◽  
Ultrafast Optical ◽  
Operating Stability ◽  
Balanced Detection ◽  
Ultrashort Laser

This paper presents a complete two-step phase-shifting (TSPS) spectral phase interferometry for direct electric-field reconstruction (SPIDER) to improve the reconstruction of ultrafast optical fields. Here, complete TSPS acts as a balanced detection that can not only remove the effect of the dc term of the interferogram, but also reduce measurement noises, and thereby improve the capability of SPIDER to measure the pulses with narrow spectra or complex spectral structures. Some prisms are chosen to replace some environment-sensitive optical components, especially reflective optics to improve operating stability and improve signal-to-noise ratio further. Our experiments show that the available shear can be decreased to 1.5% of the spectral width, which is only about $1/3$ compared with traditional SPIDER.

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