Application:
A fiber port cluster for a magnetooptical trap, see page 66
Laser beam coupler
60SMS…, see page 9
D
A.3
6
C
E
A.2
B
8
A
F
A
A.2
A.3
B
D
F
Single-Cube
with through-holes for linear
arrangements, short design
Order Code 48MC-SM-19.5
Single-T-Cube
for T-arrangements
Order Code 48MC-LTS-19.5
Double-Cube
with through-holes for linear arrangements
Order Code 48MC-LI-19.5
Double-T-Cube
for T-arrangements
Order Code 48MC-LT-19.5
Single-X-Cube
for X-arrangements
Order Code 48MC-LTD-19.5
Triple-X-Cube
for X-arrangements
Order Code 48MC-CL-19.5
A.1
"multicube" element A.1 radially arranged
screws M3 for fixing the connecting rods 8 ,
screws M3 for fixing components with 19.5 mm system mount,
and
screws M2 for fixing a variety of adapter flanges 6 .
Polarization beam splitter, C Beam splitter,
Beam combiner, E Retardation optics,
Laser beam coupler
The major design features of the Schäfter+Kirchhoff "multicube"
components ensure highly rugged and warp-resistant setups, especially for singlemode fiber coupling. The "multicubes" are combined and fixed using four Ø 6 mm rods in parallel and are compatible with established microbench systems. The rods are located
in full through-holes or partial blind-holes at least 2 diameters deep
(12 mm). Each rod is locked using two M3 screws (1.5 mm Hex
screwdriver) that are radially opposed across the "multicube",
eliminating any distortion and ensuring highly reproducible results
and assemblies.
Precision is everything: a singlemode fiber at 780 nm has a mode
field diameter of only 5 μm – ten times less than the width of a
human hair.
The "multicube" construction system is the perfect integration
platform for laser beam couplers, beam combiners, beam splitters,
polarizers or retardation optics. Self-supporting modules and laser
beam assemblies can be created that are extremely resistant to
torsion and contain complementary components, such as the laser
diode collimator 48TA… and Faraday isolator 48FI-5-… on the
mounting bracket 48MB.
Applications: see the laser diode beam sources 48TE-...,
page 75, and fiber port clusters for magneto
magneto-optical
optical traps
n page 65.
(MOTs) on
Mounting Plate
for mounting Ø 19.5, 25 or
32 mm system components
Order Code 48MC-MP-19.5
Order Code 48MC-MP-25
Order Code 48MC-MP-32
Extended Mounting Plate
Mechanical Shutter
for mounting Ø 19.5 or 25 mm aperture Ø3 mm
system components
system mount Ø 19.5 mm
Order Code 48MC-SP-19.5
Order Code 48AT-S
Order Code 48MC-SP-25
8
Mechanical Attenuator
with micrometer screw, aperture Ø3 mm,
system mount Ø 19.5 mm
Order Code 48AT-A
6
x/y Adjustment plate
for lateral adjustment,
translation 1 mm
Order Code 48MB-19.5-SXY-1
Laser with a
two-fiber
system
5
6
4
3
5
4
2
1
Fiber-optical components:
1 Retardation optics O/2
2 Polarization beam splitter
3 Polarizer
4 Laser beam coupler
5 Singlemode fiber cable
6 Option: fiber collimator
48WP-2-CA-532L
48PM-CC-A
48PM-S
60SMS-...
PMC-480-...
60FC-4-...
Multicube_FiberOpt.indd • Page 60
Construction Kit "multicube"
Combination Cubes and Plates 48MC-…
Construction Kit "multicube"
48MC-...
F
Extended Mounting Bracket
150 x 60 mm or 60 x 60 mm, system mount Ø 19.5 mm
Order Code 48MB-19.5-150
Order Code 48MB-19.5-60
60 01-2016 E
Kieler Str. 212, 22525 Hamburg, Germany
•
Tel: +49 40 85 39 97-0
•
Fax: +49 40 85 39 97-79
•
info@SuKHamburg.de
•
www.SuKHamburg.com
Beam Splitter and Beam Combiner
D
Polarizers
Polarization Beam Splitter 48PM-CC...
Polarizer 48PM-...
Beam-splitting cube with internal dielectric and polarizing multilayer
coating. In adjustable mount, for mounting with clamp collar (included).
50:50 split ratio for linearly polarized input radiation with polarization
direction D= 45°. Maximum transmission at D= 0° (p-pol.) with
maximum reflection at D= 90° (s-pol.).
• extinction ratio 10,000 : 1
• clear aperture 6 mm • reflection angle 90°
• broadband AR coating R < 0.5% per surface
• adjustable within adapter flange
• polarization: linear
• extinction ratio 10 000:1
• clear aperture 3.5 mm
• broadband AR coating: R <0.5% per surface
• variety of designs
Application:
Beam splitter with
adjustable splitting
ratio, in combination
with retardation optics
48WP-CA-...
A
A
Polarizer
in adapter flange as 48MB-19.5AC
Order Code 48PM-S-...
B
Polarizer as 48PM-S
decentered 0.3 mm for combining with
beam splitter plate 48BS-...
Order Code 48PM-S-D-...
C
Polarizer with attenuator
in adapter flange 48AT-19.5AC-S1
Order Code 48PM-AT-19.5AC-...
Polarization Beam Splitter
Order Code
48PM - CC - A
Spectral range [nm]
A = 450 - 700 nm
B = 750 - 1100 nm
C = 1100 - 1700 nm
B
Beam Splitter Cube 50/50 48BM-CC...
Beam Splitter 50/50
48BM - CC - A Order Code
C
Spectral range [nm]
A = 450 - 700 nm
B = 750 - 1100 nm
C = 1100 - 1700 nm
Application:
For increasing the
extinction ratio after
collimating the radiation
of a polarizationmaintaining fiber
Beam Splitter 98/2 48BS-CC-A
Retardation Optics O/2 48WP-2-CA-...
The O/2-plate rotates the polarization direction of a linearly
polarized input beam.
• clear aperture 5 mm
• in adjustable mount with self-locking tubular axis (0-360°)
• rotation around axis that is inclined 2° with respect to the
optical axis. This avoids interference and back-reflection
• quartz plate
type L: low order for low angle sensitivity
type Z: zero order for low wavelength dependency
Application:
Retardation Optics O/2
In combination with
48WP - 2 - CA - 780 L Order Code
polarization beam
splitter 48PM-CC-...,
low order L
beam splitter with
zero order Z
adjustable splitting
wavelength
ratio
in nm
In adjustable mount, for mounting with clamp collar (included).
• 1 mm fused silica plate, back side coated (AR 400-700 nm)
• 0.3° wedge angle for interference suppression
• reflection 1%, transmission 99% (p-polarization)
• reflection 10%, transmission 90% (s-polarization)
• clear aperture 10 mm
Beam Splitter 99/1 (10/90)
Order Code
48BS - CC - B
D
Beam Combiner 48BC-CC-LP...
Beam Combiner
48BC - CC - LP xxx Order Code
Spectral range [nm]
Reflection Transmission Pol.
long pass
LP436
370 - 412 460 - 700 s
LP510
405 - 488 532 - 660 s
LP570
532 - 544 594 - 660 s
LP580
500 - 560 600 - 700 p
500 - 560 780 - 2100 p
LP725
LP800
630 - 780 820 - 880 s
short pass
SP1500 1650 - 1700 1200 - 1380 p
Multicube_FiberOpt.indd • Page 61
B
Dichroic Retardation Optics 48WP-2-O-1-O
The dichroic retardation plate is a O/2-plate for one wavelength and
does not affect the polarization of another wavelength. The correctly
positioned plate rotates two orthogonally polarized input beams of
different wavelengths into linear polarization states in parallel.
• clear aperture 5 mm
• in adjustable mount with self-locking tubular axis (0 - 360°)
• to avoid interference and back-reflection, the mount is
inclined at 3° with respect to the tubular axis
• quartz plate of low order
D
2D
Application:
In combination with
polarization beam
splitter 48PM-CC-...,
beam combiner for two
wavelengths too close
for dichroic beam
combiners ('O<30 nm)
Dichroic Retardation Optics
48WP - 2-780 - 1-767 Order Code
O wavelength
in nm
O/2 wavelength
in nm
Photo Detector 48PD-...
Beam splitter and beam combiner with wedge-shaped substrate:
A
2D
Two laser beams of different wavelengths are coaxially combined
into a single laser beam with equal polarization. In adjustable
mount, for mounting with clamp collar (included).
• 1mm fused silica plate with O-dependent dielectric coating
and 0.3° wedge angle for interference suppression
• long pass (LP) and short pass (SP) version
• optimized for angle of incidence 45°, p-polarization
• fused silica plate
• coated reverse surface
• clear aperture 10 mm
• reflection up to 99%, transmission up to 95%
For a complete, fiber-coupled
RGBV-Beam Combiner, see page 52 or
www.SuKHamburg.de/dl/rgbv_e.pdf
Order Code
Spectral range
A = 450 – 700 nm
B = 750 – 1100 nm
C = 1100 – 1700 nm
Retardation Optics
Beam Splitter 99/1 (10/90) 48BS-CC-B
Application:
For the coincident
coupling of laser
diode beam sources
of different wavelengths and identical
polarization into one
singlemode fiber
Polarizer
48PM - S - A
A
Option S
(standard)
B
S-D
(decentered)
SXY1
(xy adjustment)
AT-19.5AC (with attenuator) C
In adjustable mount, for mounting with clamp collar (included).
• 1 mm fused silica plate, uncoated
• 0.3° wedge angle for interference suppression
• transmission 98% (p-polarization)
• reflection 1% per surface (p-polarization)
• clear aperture 10 mm
Beam Splitter 98/2
Order Code
48BS - CC - A
Application:
Separation of a
partial beam for
power monitoring
Construction Kit "multicube"
Optics for the "multicube" System
A Substrate without wedge:
Beams are twice reflected at the media/air interfaces
in parallel with the primary beam. They are focussed
by the coupling lens onto the shared fiber input.
Interference of the primary beam by the secondary
beams (Etalon effect) causes intensity instabilities.
B Substrate with wedge:
The principle beam and beams reflected at the
media/air interfaces are inclined twice with respect
to each other. The focussing optics transform the
different beams into distinct spots. The tilt mechanism
of the laser beam coupler brings the principle spot
onto that of the fiber input and the inclined secondary
spots are lost. The removal of interference prevents
intensity instabilities.
Si-Detector 48PD-BPX61
•
•
•
•
•
•
photodiode BPX 61
spectral range 400 – 1100 nm
>50 nA/lx, >320 mV/lx, 72 pF, 20 ns
active area 7 mm2
3°-angled mount in housing for system mount Ø 19.5 mm
diode and SMA connector galvanically isolated
Application:
Power monitoring in
combination with
beam splitter 98/1
48BS-CC-PA
Photo Detector 48PD-BPX61
Order Code
01-2016 E
Kieler Str. 212, 22525 Hamburg, Germany
•
Tel: +49 40 85 39 97-0
•
Fax: +49 40 85 39 97-79
•
info@SuKHamburg.de
•
61
www.SuKHamburg.com
Schäfter+Kirchhoff offers numerous adapters and flanges suitable for incorporation into the "multicube" system. Standard adapters are Ø 19.5 mm with a V-groove, while flanges have throughholes for mounting onto a combination cube using rods and
provide a 19.5 mm tightly fitting cylinder for centering. The depicted adapters and flanges are only a representative selection of
the wide variety of components supplied by Schäfter+Kirchhoff
and requests for customer-specific components are welcomed.
Adapter Flange for components with Ø 8 mm
for fitting to Ø 19.5 mm system mount
Order Code 48MB-19.5 AC+8
Adapter Flange for components with Ø 8 mm
to Ø 19.5 mm, decentered 0.3 mm
Order Code 48MB-19.5AC-D
Adapter For upscaling Ø 12 mm
components for Ø 19.5 mm mounting
Order Code 12AM19.5
Adapter for downscaling Ø 25.4 mm
components for Ø 19.5 mm mounting
Order Code 19.5AC-25
Adapter C-mount
Adapter for Ø 19.5 mm to C-mount
Order Code C-mount-19.5AC
Adapter C-mount
Adapter for Ø 25 mm to C-mount
Order Code C-mount-25
Spacer With Ø 19.5 mm
both ends
Order Code 48S-19.5
Adapter Both ends with Ø 19.5 mm
mount and v-groove
Order Code 19.5AC19.5
Adapter for Microscope Lenses
Adapter for Ø 19.5 mm to W0.8"x1/36"
Order Code W0.8-19.5
Adapter for Microscope Lenses
Ø 19.5 mm to W0.8"x1/36" outer thread
Order Code W0.8-I-19.5
Ø 19.5
11
6
Ø 25
Iris
Aperture Ø 1 - 13 mm Order Code 13BL1-13
Aperture Ø 0 - 12 mm Order Code 13BL0-12
13
22.5
16
Ø 19.5
Ø 19.5
5.5
Ø 19.5
Ø 19.5
Ø 25
5.5
M17x0.75
5.5
Ø 19.5
18
Ø 23
Ø8
Order Code 19.5AF25.4-S
Ø 25
Adapter for mounte
mounted Optics
Ø 19.5
Ø1-13
Ø 25
Ø 19.5
5.5
6
9.5
Shutter Clear Aperture 5mm, both ends
with Ø 19.5 mm male/female,
Order Code 13S-5-1
Adapter Both ends with Ø 19.5 mm, male/
female
Order Code AC19.5/19.5-S
Cap
For Ø 19.5 mm system mounting
Order Code 48C-19.5
Light Trap
For absorbing unused beams
Order Code 48LT-19.5
Adapter for attaching Optics with Ø 8mm
Ø 19.5 mm for attaching e.g. 5M-...or 5PF-...
Order Code 8AM-19.5
Tube with Ø 19.5 mm
both ends
Order Code 48T-19.5
Please contact
Schäfter+Kirchhoff
for adapters
and flanges with
dimensions, threads
or holes not listed
Adapter Flange with Attenuator
A
Clear aperture: Ø 3 mm; Ø 19.5 mm system mount
Order Code 48AT-19.5AC-S1
Accessories
Tools for Assembly and Adjustment
L
R d ffor combining
Rod
bi i
multicubes
Order Code
48MC-6-L
L = 30
L = 75
L = 150
xxx = length of choice
H
b screw
Hex grub
DIN 914 M3x3-conical
for mounting Ø 19.5 mm
components with v-groove
- set of 50 pcs.
Order Code
48-M3-3-914-50
Hex Screwdriver
Order Code
50HD-15
H
b screw
Hex grub
DIN 913 M3x3-flat for
fixing rods to multicubes
- set of 50 pcs.
Eccentric tool
for laser beam couplers 60SMS-... and
fiber collimators 60FC-...
Order Code 60EX-4
Order Code 60EX-5
for focal length f’ t 20 mm
Order Code
48-M3-3-913-50
Hex Screwdriver
Order Code
50HD-15
Hex screwdriver
WS 1.5 mm for screws
DIN 912, 913, and 914
Grub screw
DIN 553
M1.6 x 1.5-conical for
mounting Ø 8 mm
components with v-groove
- set of 50 pcs.
Grub screw
DIN 551 M1.6 x 1.5
for fixing fiber ferrules
to 60FC-... and
60SMS-...
- set of 50 pcs.
Order Code
48-M2-8-912-50
Hex Screwdriver
Order Code
50HD-15
Order Code
48-M1.6-1.5-553-50
Screwdriver
Order Code
9D-12
Order Code
48-M1.6-1.5-551-50
Screwdriver
Order Code
9D-12
Screwdriver
WS 1.2 mm for grub
screw in fiber ferrules
and accessories 5M-...
Order Code
55EX-5
Order Code
9D-12
Adjustment tool
for rotating quarter-wave
plates in fiber collimators 60FC-Q...
Order Code 50HD-15
Hex screw
DIN 912 M2 x 8
for mounting
Ø 19.5 mm components
using a clamp collar
- set of 50 pcs.
Eccentric tool
for fiber collimators
60FC-T-... and
60FC-Q...
Order Code 60Z-2803
Eccentric tool with longer handle
for laser beam couplers 60SMS-... and
fiber collimators 60FC-... as an alternative
to 60EX-4, 60EX-5, 55EX-5 above
Order Code 60EX-4-L
Order Code 60EX-5-L
Order Code 55EX-5-L
Polarization Analyzer
SK010PA-... (page 71)
62 01-2016 E
Kieler Str. 212, 22525 Hamburg, Germany
•
Tel: +49 40 85 39 97-0
•
Fax: +49 40 85 39 97-79
•
info@SuKHamburg.de
•
www.SuKHamburg.com
Multicube_FiberOpt.indd • Page 62
Construction Kit "multicube"
Flanges and Adapters for System Mount Ø 19.5 mm
Fiber-Fiber Couplers 60FF-...
1
60FF-... Fiber-fiber couplers are used to connect two singlemode fibers
that have different numerical apertures and mode field diameters.
A large variety of fiber collimator lenses 1 and 6 (see Fiber Collimators
60FC-...) and of laser beam coupler lenses 1 (see Laser Beam Coupler
60SMS-...) is available.
The fiber-fiber coupler can be aligned and focussed so that fiber cables
with non-core centered connectors can be coupled with a low coupling
loss and, additionally, the polarization axes can be aligned.
60FF-... Fiber-fiber couplers are available with optics for wavelengths
in the range 370 – 2300 nm and with inclined or coaxial coupling axes
for use with connectors of type FC-PC or FC-APC, respectively.
The 60FF-... Fiber-fiber coupler A , consisting of a laser beam coupler
1 and a fiber collimator 2 , is delivered with a maximum outer diameter
of Ø 24.5 mm and a base plate 3 . Optionally, the system B , consisting
of two laser beam couplers, is equipped with an extended mounting
bracket 4 and can be expanded using a limitless combination of
"multicube" optics and flanges, e.g. a polarizer 5 or retardation optics
6 . For extending the fiber-fiber coupler C , a second mounting plate
7 and four more rods are supplied.
2
A
3
Option
1
5
1
B
4
60FF – 60SMS - … - 60FC - … Order Code
Fiber collimator for versions
of Fiber Collimator 60FC-...,
see pages 33ff
6
1
Option
Laser beam coupler for versions of
Laser Beam Coupler 60SMS-..., see pages 9ff
60FF = Fiber-fiber coupler
1
5
7
Figure 1: 60FF-... Fiber-fiber couplers.
Modular system using the following components:
1 Laser beam coupler 60SMS-...
5 Polarizer 48PM-S-...
2 Fiber collimator 60FC-...
6 O/2 retardation optics 48WP-...
3 Base 60SM-AFC-12-25
7 Mounting plate 48MC-MP-19.5
4 Mounting bracket 48MB-19.5-60
C
4
Applications::
Fiber-Coupled Faraday Isolator
The fiber-to-fiber coupler with Faraday isolator from Schäfter+Kirchhoff
supresses back-reflection and also offers attenuator and shutter
functionalities. The Faraday isolator consists of a Faraday rotator
inbetween two polarizers with 45°-displaced main axes. The first
polarizer is adjusted for maximum transmission of the incoming beam.
The linear polarization axis of the incoming beam is rotated 45° by the
Faraday rotator and the second polarizer is aligned with this rotated
axis to ensure further maximum transmission of the beam. Any backreflected light passing back through the same system is rotated a
further 45° by the Faraday rotator. The linear state of polarization is
now perpendicular to the input beam axis and the back-reflections are
successfully blocked by the first polarizer.
A fiber-to-fiber coupler with Faraday isolator is used to protect laser
beam sources where the attached fiber connectors cannot be removed
(e.g. a fiber pigtail) or when back-coupling to the fiber is a desirable
and discriminating characteristic (e.g. in interferometry).
1
5
2
4
3
1
1
3
2
1
Figure 2: Fiber-fiber coupler with Faraday Isolator
Set-up
Multicube_FiberOpt.indd • Page 63
Pos. Description
Order Code
60SMS-1-4-...
Explanation
equivalent to fiber collimator
60FC-A19.5-4-..., adjustable
avoids back-coupling of laser
radiation into the fiber
1
Laser beam coupler
2
Faraday isolator
3
Attenuator/Shutter
48AT-A/ 48AT-S Attenuator or shutter mechanism
4
Console
48MB-19.5-60
5
Mounting Plate
48MC-MP-19.5
48FI-...
01-2016 E
Kieler Str. 212, 22525 Hamburg, Germany
•
Tel: +49 40 85 39 97-0
•
Fax: +49 40 85 39 97-79
•
info@SuKHamburg.de
•
63
www.SuKHamburg.com
Construction Kit "multicube"
Applications::
Order Code
Pos. Description
Explanation
equivalent to fiber collimator 60FCA19.5-4-..., adjustable
increases extinction ratio, offset
48PM-S-D
correction for 3
reflects 1% of beam to photo-diode
48BS-CC-PA00
48PD-65 for monitoring
60SMS-1-4-...
1
Laser beam coupler
2
Polarizer (small)
decentered
3
Beam splitter 98:1
4
Retardation optics O/2 48WP-2-CA-... manual adjustment of laser outputs
5
Polarization beam
splitter, adjustable
6
Polarizer (small)
7
8
9
Console
10
Spacer
11
Cap
12
Photo diode
13
Rod
48PM-CC-...
48PM-S
Combination cube
Combination cube
splits the polarization axes (50:50 @
45°)*
to improve extinction ratio before
coupling*
48MB19.5-60
48MC-SM-19.5
48MC-LTS-19.5
48S-19.5
avoids gap between console and
cube
48C-19.5
48PD-BPX61
48MC-6-...
together with adapter flange
48MB-19.5 AC
locks and stiffens the system
*angles other than 45° for 48PM-CC-... cause lower extinction ratios
Laser Attenuators 48AT-...
Laser
OUT
48AT-0-... Laser Attenuators are used for reproducible and precise
reduction of the power output by the laser.
The collimated laser beam is constricted by a precision ball-bearing
transported by a scaled micrometer screw. The subsequent singlemode
fiber coupling is used as a mode filter.
This mechanically stable attenuation method allows the precise and
reproducible setting of the laser power output over a wide range
(typically 0.5 to >60 dB).
Compared with power regulation by modulation of the laser current, the
wavelength and polarization status of the laser beam are preserved.
Laser
ser
IN
Figure 3: 48AT-...
laser attenuator
0
1
-20
Typical calibration curves
-40
0,4
0
,4
7
8
9
0
10
7
8
9
Input: Laser Beam
Coupler 60SMS-…
Receptacle for
FC-PC connector = 0
FC-APC connector = 4
(inclined coupling axis)
10
Micrometer Position (mm)
Micrometer Position (mm)
Photodiode
Figure 4:
48AT-F-...
Laser Attenuator with
monitor diode
Order Code
4 = Output:
Laser beam coupler 60SMS-…
Coupling lens,
receptacle for
0 = FC-PC connector
4 = FC-APC connector
(inclined coupling axis)
0
,6
0,6
0,2
Attenuation in dB
-60
48 AT-0-SMS-1- 4 - A11 - 02 + SMS- 1- 4 - A11 - 02
Relative
Power Output
0,8
0
,8
Collimating lens
Assortment see Laser Beam Coupler 60SMS-..., page 9
• Reproducible power attenuation and safety constraints are only
assured for singlemode fibers that have a Gaussian intensity profile
• Fiber collimator and laser beam coupler with inclined or coaxial
coupling axis for singlemode fibers with FC-APC or FC-PC connector
(optionally F-SMA)
• Insertion loss typically 0.5 dB, extinction >60 dB
• Can be used as interface between different types of fiber or connector
Optional:
48-AT-F-...
Laser Attenuator with
1% partial beam
separation for
power
monitoring
48 AT - F.... Order Code For lens selection, see order code 48AT-0-...
Figure 5:
48AT-MD-...
Laser Attenuator
with
motorized drive
Schäfter+Kirchhoff also offers the 48AT-MD-... Motorized Laser
Attenuators.
The 48AT-MD-... Motorized Laser Attenuators are identical with the
manual 48AT-0-... Laser Attenuators in all respects, except for the
replacement of the manual micrometer screw by a motorized version.
Motor drive
The additional parameters for the motorization are:
• Closed-loop DC motors
• Min. incremental motion down to 0.05 μm
• Max. velocity 2 mm/s
• Limit switch control
• Controllable via USB and RS-232 interface
• User software
• Macro-programmable stand-alone functionality
• Additional I/O ports
• DLLs and LabVIEW driver
Optional:
48-AT-MD-...
Laser Attenuator
with motorized drive
Order Code For lens selection, see order code 48AT-0-...
48 AT-MD-...
AT-
2016 E
64 01-2016
Kieler Str. 212, 22525 Hamburg, Germany
•
Tel: +49 40 85 39 97-0
•
Fax: +49 40 85 39 97-79
•
info@SuKHamburg.de
•
www.SuKHamburg.com
Multicube_FiberOpt.indd • Page 64
Construction Kit "multicube"
Fiber Port Cluster 1o4
The fiber port cluster 1o4 is capable of splitting an input
beam into 4 outputs, each with individually adjustable
5
output powers. The incoming beam is initially
polarized 2 so that a weak polarization
1
stability of the laser source does not
10
4
8
cause disturbing side-effects. At
the beam splitter 3 , < 2%
6
5
of the beam is
3
12
4
9
1
reflected onto a
photodiode 12 acting
as a power monitor.
5
The majority of the
7
radiation passes the
first O/2 optics 4
4
8
used for adjustment
6
of the splitting ratio
1
2
8
11
13
1
1
of the subsequent
beam splitter 5 .
Combinations of half-wave plate and beam splitter can be cascaded almost
endlessly. The four split beams are directed into the laser beam couplers that
act as outgoing ports for the attached fiber cables. Polarizing beam splitters
produce a high degree of polarization in the non-deflected and a low degree
in the deflected beam and, so, it is necessary to use additional smaller
polarizers 6 to increase the degree of polarization of the outgoing beam.