Abstract
An ultrafast spectrum programmable femtosecond laser may enhance the performance of a wide variety of scientific 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 first time a programmable binary device reported to shape the amplitudes of ultrafast pulses spectrum at up to 32[Formula: see text]kHz rate over a broad wavelength range. The DUPS is highly efficient, 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 profile, have been demonstrated in our experiments. A feedback operation process is implemented in the DUPS to ensure a robust and repeatable shaping process. The total efficiency of the DUPS for amplitude shaping is measured to be 27%.
Highlights
Programmable ultrafast optical pulse shapers have wide applications ranging from basic dispersion control to custom-shaped laser pulses for controlling the motion of quantum states,[1] photochemical reactions,[2] etc
We present a digital micromirror device (DMD)-based ultrafast pulse shaper, i.e., DUPS, therst binary pulse shaper achieving arbitrary spectrum amplitude shaping with an e±ciency of 27%
We have presented a DMD-based ultrafast pulse shaper, i.e., DUPS, with both theoretical analysis and experimental results, achieving arbitrary spectrum amplitude shaping with 27% e±ciency for therst time
Summary
Programmable ultrafast optical pulse shapers have wide applications ranging from basic dispersion control to custom-shaped laser pulses for controlling the motion of quantum states,[1] photochemical reactions,[2] etc. Spectrum amplitude shaping is important in ultrafast pulse shaping due to its broad scientic and industrial applications MEMS-based pulse shapers[14] have the advantages of broadband re°ectivity, high e±ciency, and fast update rate (up to kHz), but their spectral resolution is relatively low (approximately tens of pixels). This technology continues to evolve in spite of the high cost. We present a DMD-based ultrafast pulse shaper, i.e., DUPS, therst binary pulse shaper achieving arbitrary spectrum amplitude shaping with an e±ciency of 27%. The overall e±ciency of the DUPS is measured to be 27%, and the shaping rate is equal to the update rate of the DMD
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