Beam Expanders With Rotating Collimation Adjustment

sodaspringsjasperUrban and Civil

Nov 15, 2013 (3 years and 8 months ago)

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Optical Systems
Free Space Isolators
E-O Devices
Spherical Singlets
Multi-Element
Lenses
Cylindrical Lenses
Aspheric Lenses
Mirrors
Diffusers
& Lens Arrays
Windows
Prisms
Gratings
Polarization Optics
Beamsplitters
Filters
& Attenuators
Gas Cells
Specifications

Scratch-Dig: 20-10

Wavefront Error: <λ/4

AR Coating: R
avg
<0.5% Over Coating Range

Damage Threshold: 100W/cm
2
CW
Optics
www.thorlabs.com
662

Internal Threading on the Input and
Output Apertures (See Drawings for Details)

Diffraction-Limited Performance

Threaded Mounting Hole for Use with Posts

Mounting Ring for Use With Many Optomechanical
Mounts

Collimation Adjustment (Rotating)

Rough Matte Black Interior Surface to Minimize Scattering
The BE Series of Galilean Beam Expanders can expand or reduce
the diameter of a collimated beam with an introduced wavefront
error of less than λ/4 (i.e. diffraction limited performance). An
expanded beam can be focused to a narrower diffraction limited
waist, while a reduced beam is sometimes necessary for use with
optics or instruments with narrow input apertures like the SA200
family of scanning Fabry-Perot interferometers (see page 648).
The compact, rugged housing contains a plano-concave singlet and
a doublet that is designed to minimize aberrations in the recollimated
beam. Both optics have broadband AR coatings to minimize surface
reflection, and the interior surface of the beam expander housing is
rough and matte black in order to minimize stray light from internal
reflections. A rotary barrel controls the adjustment of the collimating
lens, and the beam expander can be mounted via a threaded hole or a
mounting ring, which are both located on the plane that is coincident
with the center of gravity of the beam expander and perpendicular to
the optical axis. Depending on the model, the hole has #4-40 or #8-
32 threads that are compatible with the mini series or TR series posts,
respectively. The mounting ring is either one or two inches in
diameter and allows the beam expander to be secured into a KS1 or
KS2 kinematic mount, respectively. The BE02M, BE10M, BE15M,
and BE20M all have SM threaded input and output apertures, which
allow additional lenses and filters to be installed easily along the
optical axis of the beam expander by using a Thorlabs lens tube. The
BE03M and BE05M have SM threaded input apertures and M36
threaded output apertures.
BE10M
10X
BE15M
15X
BE20M
20X
BE02M
2X
BE03M
3X
BE05M
5X
8-32 UNC 6mm Deep
SM1 Thread
SM2 Thread
Ø2" Mounting Ring
267 -287 mm
Max Input
4.50mm
(Ø0.18")
(10.51-11.30")
Ø59mm
(Ø2.32")
Max Output
Ø48mm
(Ø1.90")
BE20M
BE02M
M36x1.5
Thread
#4-40 UNC
3mm Deep
SM05
Thread
Ø1" Mounting
Ring
40mm
(Ø1.57")
Max
Output
28mm
(Ø1.10")
Max Input
Ø8mm
(Ø0.31")
(2.64-2.83")
67-72mm
SM05
Thread
SM1 Thread
#4-40 UNC 3mm Deep
38 - 42mm
Max Input
Ø8mm
(Ø0.31")
(1.5-1.7")
Max
Output
16mm
(Ø0.63")
Ø1"
Mounting
Ring
Ø31mm
(Ø1.22")
M36x1.5 Thread
#4-40 UNC
3mm Deep
SM05
Thread
Ø1"
Mounting Ring
70 - 78mm
Max Input
Ø4.50mm
(Ø0.18")
Ø42mm
(Ø1.57")
(2.76-3.07")
Max
Output
Ø28mm
(Ø1.10")
BE05M
BE03M
APPLICATION
IDEA
BE15M Mounted on a TR Series Post
SEE
PAGE 79
Beam Expanders With Rotating Collimation Adjustment
1 OpticalSystems 646-670.qxd.P 7/17/07 2:37 PM Page 662