Abstract
We apply ultrafast polarization shaping to an ultrabroadband carrier envelope phase (CEP) stable white light supercontinuum to generate polarization-tailored bichromatic laser fields of low-order frequency ratio. The generation of orthogonal linearly and counter-rotating circularly polarized bichromatic fields is achieved by introducing a composite polarizer in the Fourier plane of a 4 f polarization shaper. The resulting Lissajous- and propeller-type polarization profiles are characterized experimentally by cross-correlation trajectories. The scheme provides full control over all bichromatic parameters and allows for individual spectral phase modulation of both colors. Shaper-based CEP control and the generation of tailored bichromatic fields is demonstrated. These bichromatic CEP-stable polarization-shaped ultrashort laser pulses provide a versatile class of waveforms for coherent control experiments.
Highlights
Ultrashort bichromatic laser fields have emerged as a new twist to coherently control ultrafast electron dynamics in atoms [1,2,3,4,5,6], molecules [7,8,9] and solids [10,11,12]
We focus on the generation of orthogonal linearly polarized (O-LP) and counter-rotating circularly polarized (CNR-CP) bichromatic fields with low-order commensurable center frequencies, extracted from an ultrabroadband white light supercontinuum (WLS) by phase and amplitude modulation
The results presented in Secs. 2.3.1-2.3.3 highlight the capability of the shaper-based approach to generate high-fidelity polarization-shaped bichromatic fields with low-order frequency ratio from a carrier envelope phase (CEP)-stable WLS
Summary
Ultrashort bichromatic laser fields have emerged as a new twist to coherently control ultrafast electron dynamics in atoms [1,2,3,4,5,6], molecules [7,8,9] and solids [10,11,12]. Due to the limited bandwidth of the pulses used in [14], the generation of low-order commensurable bichromatic fields has not been shown so far In this contribution, we apply the scheme to an octave-spanning white light supercontinuum (WLS) from a carrier envelope phase (CEP) stabilized WL source and demonstrate the generation of ultrashort polarization-tailored bichromatic fields with variable frequency ratios (Mω : Nω), for small integer numbers M and N. The composite polarizer consists of two adjacent areas with orthogonal transmission directions, horizontally aligned such that the low frequency part of the spectrum is s-polarized while the high frequency part is p-polarized By this means, two orthogonally polarized spectral bands are independently phase- and amplitude-modulated yields polarization-shaped O-LP fields at the shaper output. The CEP stability of the generated fields is investigated and shaper-based control of the CEP is demonstrated
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