18 Unpacking the FSM
3.2 Standard Mirror Options
FSM-300
Mirror Substrate Material Pyrex
Mirror Retaining Mechanism Mirror bonded to aluminum carrier (user replaceable).
Mirror Pivot Point (centered on
mirror)
Gimbaled 12.19 mm behind mirror surface
Mirror Diameter 25.4 mm
Mirror Thickness 6.0 mm
Mirror Wedge
≤ 5 arc min
Clear Aperture
(3)
at 0° angle of
incidence
≥ 20.3 mm
Clear Aperture
(3)
at 45° angle of
incidence
≥ 14.4 mm
Surface Flatness
(3)
(after coating
and bonding)
≤ λ/10 at 632.8 nm over clear aperture
Surface Quality
(3)
15-5 scratch-dig
Reflectivity, Standard
Coatings
(3)
ER.1 Coating: Enhanced
Aluminum
> 93%, 450-700 nm
ER.4 Coating: Protected Gold > 96%, 650- 1700 nm; > 98% from 1.7-2.0 µm
Additional coating options Please contact Newport.
FOOTNOTES:
1) Optical angular range is equal to twice the mechanical angular range.
2) Measured under position output control. Optical closed-loop performance is also determined by
external feedback electronics.
3) Optical parameters apply to central 80% of mirror aperture.
NOTES:
4) Performance data is based upon well-defined, smooth, D-A sine wave inputs. Alternate inputs
(square waves, triangle waves, low resolution D-A sine waves) are addressed in section 6.3
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