Handling
Being extremely thin, an SDF is also extremely fragile. Therefore, an SDF is usually mounted onto a special frame immediately after pulling and is never detached from this frame.
Another issue is dust particles which may adsorb to the surface of an SDF. If significant laser power is coupled into the fibre, dust particles will scatter light in the evanescent field, heat up and may thermally destroy the waist. In order to prevent this, SDF are pulled and used in dust-free environments such as flowboxes or vacuum chambers.
Read more about this topic: Subwavelength-diameter Optical Fibre
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