Title :
A Method for Measuring the Pulsewidth at Different Spatial Positions of Ultrashort Laser Pulses
Author :
Yangbao Deng ; Xiquan Fu ; Chao Tan ; Shuguang Deng ; Cuixiu Xiong ; Guangfu Zhang ; Lifu Zhang
Author_Institution :
Key Lab. for Micro/Nano Optoelectron. Devices, Minist. of Educ., Hunan Univ., Changsha, China
Abstract :
In this letter, we propose a method for measuring the pulsewidths at different spatial positions of ultrashort laser pulses. By measuring the pulsewidths varying with spatial positions of chirped and chirped-free femtosecond laser pulses, it is found that pulsewidths at edge positions are longer than that of central positions due to the effect of residual spatial chirp. Then, we measure the temporal evolutions of pulse at the strongest spatial modulation position after small-scale self-focusing and our results show that the pulsewidths become narrower with increasing spatial contrast due to spatiotemporal coupling effect. We find that the method is reliable and feasible.
Keywords :
high-speed optical techniques; laser variables measurement; optical modulation; optical self-focusing; spatiotemporal phenomena; chirped femtosecond laser pulses; chirped-free femtosecond laser pulses; edge position; pulsewidth measurement; residual spatial chirp; small-scale self-focusing; spatial contrast; spatial modulation position; spatiotemporal coupling effect; temporal evolution; ultrashort laser pulses; Chirp; Laser excitation; Measurement by laser beam; Optical pulse generation; Position measurement; Pulse measurements; Pump lasers; Temporal evolution; modified cross-correlation; ultrafast laser technology;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2320959
