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High fidelity detection of the orbital angular momentum of light by time mapping

Bierdz, Paul, Kwon, Minho, Roncaioli, Connor, Deng, Hui·2013·New Journal of Physics
DOI 10.1088/1367-2630/15/11/113062
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Figure 1 (a) Schematic of the OAM spectrometer, consisting of an optical loop that converts an input pulse into a sequence of pulses equally spaced in time, a VPP that decreases the OAM value by 1 per pass, and an SMF to filter out states with non-zero OAM. (b) Showing how the OAM value changes in time for an example input state with ℓ 0 = 3.
Figure 1 (a) Schematic of the OAM spectrometer, consisting of an optical loop that converts an input pulse into a sequence of pulses equally spaced in time, a VPP that decreases the OAM value by 1 per pass, and an SMF to filter out states with non-zero OAM. (b) Showing how the OAM value changes in time for an example input state with ℓ 0 = 3.CC-BY · From the PDF
Figure 2 (a-e) The intensity measured with a camera of the different initial OAM beams from the SLM with ℓ = 0 -4. (f-j) The phase fronts of the input OAM beams. They are calculated from the interference patterns between the OAM beams and a reference Gaussian beam, as explained in the text.
Figure 2 (a-e) The intensity measured with a camera of the different initial OAM beams from the SLM with ℓ = 0 -4. (f-j) The phase fronts of the input OAM beams. They are calculated from the interference patterns between the OAM beams and a reference Gaussian beam, as explained in the text.CC-BY · From the PDF
Figure 3 (a) Unnormalized power through the fibre versus the number of passes through the loop without a VPP and different initial OAM values ( ℓ 0 = 0 , 1) set by the SLM. (b) Computed misalignment of SMF.
Figure 3 (a) Unnormalized power through the fibre versus the number of passes through the loop without a VPP and different initial OAM values ( ℓ 0 = 0 , 1) set by the SLM. (b) Computed misalignment of SMF.CC-BY · From the PDF
Figure 4 (a-e) Streak camera images for OAM eigenstates ( ℓ = 0 , 2 , 4) normalized based on (1). (f) Tabulated results of the OAM spectrometer up to ℓ = 4.
Figure 4 (a-e) Streak camera images for OAM eigenstates ( ℓ = 0 , 2 , 4) normalized based on (1). (f) Tabulated results of the OAM spectrometer up to ℓ = 4.CC-BY · From the PDF
Figure 5 Calculated the geometric mean of crosstalk (in dB) as a function of the lateral misalignment of the SMF and VPP (normalized by w 0 ). (a) Crosstalk (in dB) as a function of the lateral misalignment of the VPP. SMF misalignment (measured in 3(c)) is taken along the x direction for convenience, since only the relative angle between VPP and SMF misalignment is important. The measured crosstalk of -20 . 9 to -21 . 6 dB corresponds to the values between the two black lines. (b) The crosstalk versus VPP misalignment with no SMF misalignment (green solid line), and the crosstalk versus SMF misalignment with no VPP misalignment (blue dashed line). (c) The upper bound of crosstalk (in dB) as a function of the SMF and VPP misalignments. The upper bound corresponds to when the directions of the SMF and VPP misalignments are perpendicular to each other. The crosstalk can be significantly reduced if the directions of the SMF and VPP lateral displacements are anti-parallel to each other.
Figure 5 Calculated the geometric mean of crosstalk (in dB) as a function of the lateral misalignment of the SMF and VPP (normalized by w 0 ). (a) Crosstalk (in dB) as a function of the lateral misalignment of the VPP. SMF misalignment (measured in 3(c)) is taken along the x direction for convenience, since only the relative angle between VPP and SMF misalignment is important. The measured crosstalk of -20 . 9 to -21 . 6 dB corresponds to the values between the two black lines. (b) The crosstalk versus VPP misalignment with no SMF misalignment (green solid line), and the crosstalk versus SMF misalignment with no VPP misalignment (blue dashed line). (c) The upper bound of crosstalk (in dB) as a function of the SMF and VPP misalignments. The upper bound corresponds to when the directions of the SMF and VPP misalignments are perpendicular to each other. The crosstalk can be significantly reduced if the directions of the SMF and VPP lateral displacements are anti-parallel to each other.CC-BY · From the PDF

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Research works printed but not linked: 24

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Metadata

Authors
Bierdz, P., Kwon, M., Roncaioli, C., & Deng, H.
Venue
New Journal of Physics
Publisher
IOP Publishing
Published
2013-11-29
Volume
15
Issue
11
Pages
113062
ISSN
1367-2630
DOI
10.1088/1367-2630/15/11/113062
Cited by
31
References
0
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