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Start // Support // Technotes // Technotes - Fiber Optics // Fiber Coupling and Collimation // Multimode fiber coupling, collimation, and producing spots // Producing spots by refocussing multimode fiber collimators

Producing spots by refocussing multimode fiber collimators

Producing spots by refocussing multimode fiber collimators

Focused spot optical scheme

Spot diameter for refocussing a multimode fiber collimator

$\emptyset_{spot}=\emptyset_{beam}\cdot\left(\frac{A}{f\prime}-1\right)$

Ø_spot: Beam diameter in focus

Øbeam: Collimated beam diameter of a multimode fiber

A: Working distance 

f’: Focal length of collimating lens