Femtosecond pulse shaping directly in the mid-IR using acousto-optic modulation
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- Femtosecond pulse shaping directly in the mid-IR using acousto-optic modulation
- Shim, Sang-Hee; Strasfeld, DB; Fulmer, EC; Zanni, MT
- Acousto optic modulations; Femtosecond pulse; Pulse shaping; Waveforms
- Issue Date
- OPTICAL SOC AMER
- OPTICS LETTERS, v.31, no.6, pp.838 - 840
- Pulse shaping directly in the raid-IR is accomplished by using a germanium acousto-optic modulator (Ge AOM) capable of programmable phase and amplitude modulation for IR light between 2 and 18 μm. Shaped waveforms centered at 4.9 μm are demonstrated in both the frequency and the time domains. With a 50% throughput efficiency, the Ge AOM can generate much more intense pulses with higher resolution than can indirect shaping methods. Furthermore, the phase stability of the shaped pulse proved sufficient for cross correlation with unshaped mid-IR pulses. Thus, phase- and amplitude-tailored pulses can now be readily incorporated into phase-sensitive experiments, such as heterodyned 2D IR spectroscopy.
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