Single-Frame Characterization of Ultrafast Pulses with Spatiotemporal Orbital Angular Momentum
- JILA and Department of Physics, University of Colorado and NIST, 440 UCB, Boulder, Colorado 80309, United States
- JILA and Department of Physics, University of Colorado and NIST, 440 UCB, Boulder, Colorado 80309, United States, KMLabs Inc., 4775 Walnut Street, Suite 102, Boulder, Colorado 80301, United States
Light that carries spatiotemporal orbital angular momentum (ST-OAM) makes possible new types of optical vortices arising from transverse OAM. ST-OAM pulses exhibit novel properties during propagation, transmission, refraction, diffraction, and nonlinear conversion, attracting growing experimental and theoretical interest and studies. However, one major challenge is the lack of a simple and straightforward method for characterizing ultrafast ST-OAM pulses. Using spatially resolved spectral interferometry, we demonstrate a simple, stationary, single-frame method to quantitatively characterize ultrashort light pulses carrying ST-OAM. Using our method, the presence of an ST-OAM pulse, including its main characteristics such as topological charge numbers and OAM helicity, can be identified easily from the unique and unambiguous features directly seen on the raw data without any need for a full analysis of the data. After processing and reconstructions, other exquisite features, including pulse dispersion and beam divergence, can also be fully characterized. Our fast characterization method allows highthroughput and quick feedback during the generation and optical alignment processes of ST-OAM pulses. It is straightforward to extend our method to single-shot measurement by using a high-speed camera that matches the pulse repetition rate. This new method can help advance the field of spatially and temporally structured light and its applications in advanced metrologies.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); MURI; US Air Force Office of Scientific Research (AFOSR); National Science Foundation Graduate Research Fellowships
- Grant/Contract Number:
- FG02-99ER14982
- OSTI ID:
- 1877753
- Alternate ID(s):
- OSTI ID: 1882582; OSTI ID: 1907658
- Journal Information:
- ACS Photonics, Journal Name: ACS Photonics Vol. 9 Journal Issue: 8; ISSN 2330-4022
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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