TY - GEN
T1 - Digital Decomposition Technique for Analyzing the Purity in Orbital Angular Momentum (OAM) Modes
AU - Mehra, Ayush
AU - Arnon, Shlomi
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - Light beams carrying Orbital Angular Momentum (OAM) are highly versatile and have many applications, especially in free-space optical communication. However, it is critical to accurately estimate the OAM spectrum to ensure optimal performance, i.e., the power distribution among the many OAM modes. When the modal decomposition technique fails due to a perturbed experimental setup, such as when the generated OAM mode and correlation filter are misaligned, a single-shot digital approach can be employed to derive the OAM spectrum. This method involves interfering with the perturbed light with a reference light, typically a plane wave, and then digitally processing and evaluating the resulting interference pattern to obtain the OAM spectrum. In our study, we utilized this single-shot digital technique to assess the purity of the generated OAM mode. Factors such as the optical aberrations e.g. astigmatism caused by the optical component, the misaligned fork grating generated on the SLM, and the laser-SLM alignment can all impact the purity of the generated OAM mode. Any perturbation will result in an OAM spectrum, which the single-shot approach can reliably detect.
AB - Light beams carrying Orbital Angular Momentum (OAM) are highly versatile and have many applications, especially in free-space optical communication. However, it is critical to accurately estimate the OAM spectrum to ensure optimal performance, i.e., the power distribution among the many OAM modes. When the modal decomposition technique fails due to a perturbed experimental setup, such as when the generated OAM mode and correlation filter are misaligned, a single-shot digital approach can be employed to derive the OAM spectrum. This method involves interfering with the perturbed light with a reference light, typically a plane wave, and then digitally processing and evaluating the resulting interference pattern to obtain the OAM spectrum. In our study, we utilized this single-shot digital technique to assess the purity of the generated OAM mode. Factors such as the optical aberrations e.g. astigmatism caused by the optical component, the misaligned fork grating generated on the SLM, and the laser-SLM alignment can all impact the purity of the generated OAM mode. Any perturbation will result in an OAM spectrum, which the single-shot approach can reliably detect.
KW - Modal decomposition
KW - OAM Spectrum
KW - OAM mode purity
KW - Orbital Angular Momentum
UR - http://www.scopus.com/inward/record.url?scp=85209920280&partnerID=8YFLogxK
U2 - 10.1109/COMCAS58210.2024.10743139
DO - 10.1109/COMCAS58210.2024.10743139
M3 - Conference contribution
AN - SCOPUS:85209920280
T3 - 2024 IEEE International Conference on Microwaves, Communications, Antennas, Biomedical Engineering and Electronic Systems, COMCAS 2024
BT - 2024 IEEE International Conference on Microwaves, Communications, Antennas, Biomedical Engineering and Electronic Systems, COMCAS 2024
PB - Institute of Electrical and Electronics Engineers
T2 - 2024 IEEE International Conference on Microwaves, Communications, Antennas, Biomedical Engineering and Electronic Systems, COMCAS 2024
Y2 - 9 July 2024 through 11 July 2024
ER -