Arbitrary amplitude femtosecond pulse shaping via a digital micromirror device
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Arbitrary amplitude femtosecond pulse shaping via a digital micromirror device
- Author:
Chenglin Gu, Dapeng Zhang, Yina Chang, Shih-Chi Chen
An ultrafast spectrum programmable femtosecond laser may enhance the performance of a wide variety of scienti¯c applications, e.g., multi-photon imaging. In this paper, we report a digital micromirror device (DMD)-based ultrafast pulse shaper, i.e., DUPS, for femtosecond laser arbitrary amplitude shaping — the ¯rst time a programmable binary device reported to shape the amplitudes of ultrafast pulses spectrum at up to 32 kHz rate over a broad wavelength range. The DUPS is highly e±cient, compact, and low cost based on the use of a DMD in combination with a transmission grating. Spatial and temporal dispersion introduced by the DUPS is compensated by a quasi-4-f setup and a grating pair, respectively. Femtosecond pulses with arbitrary spectrum shapes, including rectangular, sawtooth, triangular, double-pulse, and exponential pro¯le, have been demonstrated in our experiments.
