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Singlets
Doublets & TripletsCylindrical OpticsMirrorsPrisms &
Retroreflectors
Beamsplitters,
Windows,
Optical Flats
Polarization
Components
Filters
High Energy
Laser Optics
Diode Laser
Optics
Comparison Between Glass Plate
Beamsplitter and a Pellicle Beamsplitter
PELLICLES
BEAM
GLASS
A pellicle beamsplitter is a high tensile strength elastic membrane,
stretched like a drumhead over a black anodized flat metal frame,
and bonded to the precision lapped edge.
$There is virtually no ghosting because the thinness of the
beamsplitter provides a separation between primary and
ghost image of less than 4 µm at 45º.
$Chromatic and spherical aberration are negligible in
converging beams.
$Low absorption across the visible spectrum. Nitrocellulose
material does exhibit some absorption in the ultraviolet and
in the infrared beyond 2 µm.
$There is no change in the optical path.
$Coatings are available to provide various beamsplitting
ratios. See table and figure for coating curves and suffixes.
SPECIFICATIONS: PELLICLE BEAMSPLITTERS
Pellicle Thickness: ≤2 µm
Material: Select optical grade nitrocellulose
Index of Refraction (nd): 1.5
Thickness Uniformity: 2¬ per 25 mm
Surface Quality: 40–20 scratch and dig
Temperature Range: 440ºC to +125ºC
Frame: Hard aluminum alloy, black anodized
Coatings:
Available uncoated or with optional coating
listed on the ext page
Pellicle Beamsplitters
f
uncoated
surface
te
45°
coated
surface
incident
reflection
transmission
fB
2 holes
thread A
D
03 BPL pellicle beamsplitters
D
(mm)
f
(mm)
te
(mm) A fB
PRODUCT
NUMBER
25.4
50.8
76.2
101.6
152.4
34.9
63.5
88.9
114.3
165.1
4.8
6.4
6.4
6.4
9.5
2-56
2-56
2-56
2-56
6-32
30.2
57.2
82.6
108.0
158.6
03 BPL 001
03 BPL 003
03 BPL 005
03 BPL 007
03 BPL 011
Pellicle Beamsplitters
To order, select pellicle and append coating suffix from graphs on the next page.
Cleaning and Handling
Pellicle surfaces must not be touched. Clean
only with a gentle flow of clean, dry air.
Chpt. 11 Final 8/28/99 2:30 PM Page 11.14
Visit Us Online! www.mellesgriot.com 111.15
Singlets Doublets & Triplets Cylindrical Optics Mirrors Prisms &
Retroreflectors Beamsplitters,
Windows,
Optical Flats
Polarization
Components Filters High Energy
Laser Optics Diode Laser
Optics
PERCENT REFLECTANCE (R) &
TRANSMITTANCE (T)
100
80
60
40
20
400 500 600 700 1.0 1.4 1.8 2.2
typical reflectance and transmittance curves
T
R
NANOMETERS MICROMETERS
WAVELENGTH
T
R
PERCENT REFLECTANCE (R) &
TRANSMITTANCE (T)
100
80
60
40
20
400 500 600 700 1.0 1.4 1.8 2.2
T
R
NANOMETERS MICROMETERS
WAVELENGTH
typical reflectance and transmittance curves
T
R
PERCENT REFLECTANCE (R) &
TRANSMITTANCE (T)
100
80
60
40
20
400 500 600 700 1.0 1.4 1.8 2.2
T
R
NANOMETERS MICROMETERS
WAVELENGTH
typical reflectance and transmittance curves
T
R
PERCENT REFLECTANCE (R) &
TRANSMITTANCE (T)
100
80
60
40
20
400 500 600 700 1.0 1.4 1.8 2.2
T
R
NANOMETERS MICROMETERS
WAVELENGTH
typical reflectance and transmittance curves
T
R
PERCENT REFLECTANCE (R) &
TRANSMITTANCE (T)
100
80
60
40
20
400 500 600 700 1.0 1.4 1.8 2.2
T
R
NANOMETERS MICROMETERS
WAVELENGTH
typical reflectance and transmittance curves
T
R
PERCENT REFLECTANCE (R) &
TRANSMITTANCE (T)
100
80
60
40
20
400 500 600 700 1.0 1.4 1.8 2.2
T
R
NANOMETERS MICROMETERS
WAVELENGTH
typical reflectance and transmittance curves
T
R
Pellicle beamsplitter coating /01 Pellicle beamsplitter coating /04
Pellicle beamsplitter coating /02 Pellicle beamsplitter coating /05
Pellicle beamsplitter coating /03 Pellicle beamsplitter uncoated
Chpt. 11 Final 8/28/99 2:30 PM Page 11.15
