
Attosecond Science Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Yu-Chieh Lin (yu-chieh.lin@riken.jp)
Published:31 December 2023,
Published Online:24 November 2023,
Received:30 June 2023,
Revised:12 October 2023,
Accepted:06 November 2023
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Lin, Y. C., Midorikawa, K. & Nabekawa, Y. Wavefront control of subcycle vortex pulses via carrier-envelope-phase tailoring. Light: Science & Applications, 12, 2711-2722 (2023).
Lin, Y. C., Midorikawa, K. & Nabekawa, Y. Wavefront control of subcycle vortex pulses via carrier-envelope-phase tailoring. Light: Science & Applications, 12, 2711-2722 (2023). DOI: 10.1038/s41377-023-01328-7.
The carrier-envelope phase (CEP) of an ultrashort laser pulse is becoming more crucial to specify the temporal characteristic of the pulse's electric f
ield when the pulse duration becomes shorter and attains the subcycle regime; here
the pulse duration of the intensity envelope is shorter than one cycle period of the carrier field oscillation. When this subcycle pulse involves a structured wavefront as is contained in an optical vortex (OV) pulse
the CEP has an impact on not only the temporal but also the spatial characteristics owing to the spatiotemporal coupling in the structured optical pulse. However
the direct observation of the spatial effect of the CEP control has not yet been demonstrated. In this study
we report on the measurement and control of the spatial wavefront of a subcycle OV pulse by adjusting the CEP. To generate subcycle OV pulses
an optical parametric amplifier delivering subcycle Gaussian pulses and a Sagnac interferometer as a mode converter were integrated and provided an adequate spectral adaptability. The pulse duration of the generated OV pulse was 4.7 fs at a carrier wavelength of 1.54 µm. To confirm the wavefront control with the alteration of the CEP
we developed a novel
$$ f $$
-2
$$ f $$
interferometer that exhibited spiral fringes originating from the spatial interference between the subcycle OV pulse and the second harmonic of the subcycle Gaussian pulse producing a parabolic wavefront as a reference; this resulted in the successful observation of the rotation of spiral interference fringes during CEP manipulation.
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