Chirp-coefficient bisection iteration method for phase-intensity reconstruction of chirped pulses
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A new method is proposed to systematically measure the phase-intensity information of chirped pulses that is based on the chirp-coefficient bisection iteration (CBI) concept. Through the CBI procedure with measured spectrum and temporal intensity profiles (or intensity autocorrelations), spectral and temporal amplitude–phase information can be rapidly retrieved. We experimentally verified that our method has high precision for nanosecond- and picosecond-level pulses and low precision for femtosecond-level pulses. Our proposed method does not require a sophisticated setup and has the advantage of accurate determination of temporal and spectral chirp coefficients with various orders. It also has lower cost, simple operation, in particular covers a wider measurement range than the main current methods. Moreover, the retrieved waveforms can reveal both the pulse shape and the actual intensity with spectral and temporal chirped coefficients of various orders, which can be directly used in various pulse propagation analyses such as chirped pulse amplification.
KeywordsUltrafast lasers Fiber optics Ultrafast measurements Nonlinear optics Chirped pulses
This research was supported by the National Natural Science Foundation of China No. 61475081.
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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