Spatial Filter Holder / SFB

Spatial filters eliminate distorted laser wavefronts and noise to emit clean spherical waves for beams.
Used in optical systems such as interferometers and holograms where wavefront quality is critical.

A well corrected achromat in the output beam of the spatial filter can be used to collimate the filtered beam.
The translation stage and two-axis pinhole allows the light through the objective lens to have good reproducibility.
Designed with an emphasis on stability, beam movement during adjustment is minimal.
A PA-25 (hole diameter 25μm) pinhole is included. Pinholes can be changed to match the diameter of the laser spot.
A Coarse/fine pinhole adjustment (SFB-16DMRO) is also available
To meet a variety of requirements, the mounting position of the objective lens can be changed, allowing objective lenses with different magnifications to be used.

Common Specifications

Primary Material	Steel, Aluminum
Finish	Black Chrome, Black Anodized

Specifications

Micrometer
Part Number			Objective Lens	Objective Lens Length	Compatible Incidence Beam diameter (1/e²)	Pinhole Diameter	Pinhole XY Adjustment Range	Objective Lens Front and Back Adjustment Range	Pinhole XY Scale MIN Reading	Objective Lens Front and Back Scale MIN Reading	Weight
With a Post φ20mm	Mounting Hole: M6 (Without a Post)	Mounting Hole: 8-32UNC (Without a Post)	Objective Lens	Objective Lens Length	Compatible Incidence Beam diameter (1/e²)	Pinhole Diameter	Pinhole XY Adjustment Range	Objective Lens Front and Back Adjustment Range	Pinhole XY Scale MIN Reading	Objective Lens Front and Back Scale MIN Reading	Weight
SFB-16RO-OBL10-25	SFB-16RO-OBL10-25-N	SFB-16RO-OBL10-25-UU	OBL-10-A	30.5mm	φ1.0mm	φ25mm	±2mm	±3mm	0.01mm/DIV	0.01mm/DIV	0.56kg (Without a Post: 0.45kg)
SFB-16RO-OBL20-25	SFB-16RO-OBL20-25-N	SFB-16RO-OBL20-25-UU	OBL-20-A	35.2mm	φ0.6mm	φ25mm	±2mm	±3mm	0.01mm/DIV	0.01mm/DIV	0.56kg (Without a Post: 0.45kg)
SFB-16RO-OBL40-25	SFB-16RO-OBL40-25-N	SFB-16RO-OBL40-25-UU	OBL-40-A	36.5mm	φ0.3mm	φ25mm	±2mm	±3mm	0.01mm/DIV	0.01mm/DIV	0.56kg (Without a Post: 0.45kg)

Coarse/Fine Movement
Part Number			Objective Lens	Objective Lens Length	Compatible Incidence Beam diameter (1/e²)	Pinhole Diameter	Pinhole XY Adjustment Range	Objective Lens Front and Back Adjustment Range	Pinhole XY Coarse Resolution	Pinhole XY Scale MIN Reading	Objective Lens Front and Back Scale MIN Reading	Weight
With a Post φ20mm	Mounting Hole: M6 (Without a Post)	Mounting Hole: 8-32UNC (Without a Post)	Objective Lens	Objective Lens Length	Compatible Incidence Beam diameter (1/e²)	Pinhole Diameter	Pinhole XY Adjustment Range	Objective Lens Front and Back Adjustment Range	Pinhole XY Coarse Resolution	Pinhole XY Scale MIN Reading	Objective Lens Front and Back Scale MIN Reading	Weight
SFB-16DMRO-OBL10-25	SFB-16DMRO-OBL10-25-N	SFB-16DMRO-OBL10-25-UU	OBL-10-A	30.5mm	φ1.0mm	φ25mm	±2mm	±3mm	0.5mm/rotation	0.0025mm/DIV	0.01mm/DIV	0.6kg (Without a Post: 0.41kg)
SFB-16DMRO-OBL20-25	SFB-16DMRO-OBL20-25-N	SFB-16DMRO-OBL20-25-UU	OBL-20-A	35.2mm	φ0.6mm	φ25mm	±2mm	±3mm	0.5mm/rotation	0.0025mm/DIV	0.01mm/DIV	0.6kg (Without a Post: 0.41kg)
SFB-16DMRO-OBL40-25	SFB-16DMRO-OBL40-25-N	SFB-16DMRO-OBL40-25-UU	OBL-40-A	36.5mm	φ0.3mm	φ25mm	±2mm	±3mm	0.5mm/rotation	0.0025mm/DIV	0.01mm/DIV	0.6kg (Without a Post: 0.41kg)