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20 January 2006 Measurement of ultrashort laser pulses with the splitting Dammann gratings
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Proceedings Volume 6027, ICO20: Optical Information Processing; 602705 (2006)
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China
The conventional beam splitter is a must optical element for splitting one femtosecond laser pulse, however, it suffers from the unpleasant chromatic dispersion caused by passing through the material due to the broadband spectrum of femtosecond laser. Measurement of femtosecond laser is usually realized by using an autocorrelator, frequency-resolved optical grating (FROG), GRENOUILLE and spectral phase interferometry for direct electric-field reconstruction (SPIDER). Usually they have to use the beam splitter for generating the two identical pulses for measurement of femtosecond laser. In this paper, we report another approach by using reflective Dammann gratings as the beam splitter. Two-layered reflective Dammann gratings provide an alternative solution of splitting by using the reflective structure, which has nice features of easy alignment, no chromatic dispersion, simple structure and low cost. Experimental implementation of the Dammann FROG apparatus by using two-layered reflective Dammann gratings generates the almost same result as the FROG method. This structure should be highly interesting as a novel approach for the measurement of femtosecond laser pulses. In addition, this structure has the possibility to replace the beam splitter in various applications, such as the pump-probe technique in femtochmistry and semiconductor, etc..
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Changhe Zhou, Enwen Dai, and Guowei Li "Measurement of ultrashort laser pulses with the splitting Dammann gratings", Proc. SPIE 6027, ICO20: Optical Information Processing, 602705 (20 January 2006);

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