We establish the first quantitative alignment tolerance specifications for holographic generation of or-
bital angular momentum (OAM) beams, addressing a critical gap between optical design and mechan-
ical implementation. While previous research focused on compensating intrinsic spatial light modu-
lator imperfections, we provide a rigorous quantification of extrinsic transverse misalignment effects.
Computational modeling of 1%–10% misalignments, combined with Hilbert–Schmidt fidelity analysis,
reveals three operational regimes: High-Fidelity (≤3%), Critical (4–5%), and Severe Degradation
(>5%). The 3% threshold (approximately 475 μm for typical gratings) emerges as a critical design
parameter for mounting systems and alignment stages. These quantitative guidelines are essential for
transitioning OAM technologies from laboratory demonstrations to robust, field-deployable systems in
optical communications and beam shaping.

We establish the first quantitative alignment tolerance specifications for holographic generation of or-
bital angular momentum (OAM) beams, addressing a critical gap between optical design and mechan-
ical implementation. While previous research focused on compensating intrinsic spatial light modu-
lator imperfections, we provide a rigorous quantification of extrinsic transverse misalignment effects.
Computational modeling of 1%–10% misalignments, combined with Hilbert–Schmidt fidelity analysis,
reveals three operational regimes: High-Fidelity (≤3%), Critical (4–5%), and Severe Degradation
(>5%). The 3% threshold (approximately 475 μm for typical gratings) emerges as a critical design
parameter for mounting systems and alignment stages. These quantitative guidelines are essential for
transitioning OAM technologies from laboratory demonstrations to robust, field-deployable systems in
optical communications and beam shaping.