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Coupling
Lenses
Coupling
a laser output with maximum efficiency into
a single-mode fiber requires a lens of extraordinary
properties. Steep aspheric curves reduce back reflections,
limiting feedback significantly in comparison to GRIN
lenses. Optical performance must be diffraction limited.
Insertion loss must be at an absolute minimum.
Such
performance is typical of OFR Laser Lenses for Fiber-Optic
and Laser Diode applications. These are micro double-aspheric
Lenses, designed for diffraction limited performance.
Both surfaces are multilayer antireflec-tion coated.
Transmittance exceeds 99% at the peak wavelength.
Mounted
LLO series lenses are AR coated and mounted in a
Microscope Objective Cell with industry standard RMS
thread. Also available in a 1" dia.x .250"
thick post-mountable cell with 8-32 tapped hole. Other
mounting options available. Please inquire.
Unmounted
LL series lenses as above but unmounted.
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*
not available for HoYAG.
NOTE:
When ordering, specify wavelength, for
example, LLO-4-4-NIR.
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*
not available for HoYAG.
NOTE:
When ordering, specify wavelength, for
example, LL-3-2-IR.
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*
LL-3-2, LLO and LLO-8-8
not
*
available for HoYAG.
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LLO
Aspheric Lenses
in RMS
Cells.
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Interchangeable
FiberPort Lenses
Normally,
the only difference between FiberPorts used in different
applications is the lens focal length, usually determined
by the application. All FiberPort Lenses are mounted
in a Cell that is compatible with all FiberPort models.
The Cell positions the principal plane of the Lens at
one focal length distance from the polished fiber endface,
resulting in collimation. FiberPort Lens Cells are magnetic,
and are easily installed and interchanged on site.
Thus,
for experimentation purposes, rather than interchanging
FiberPorts (containing different focal length lenses),
it is more economical to interchange Lenses, mounted
in their magnetic Cell, using a single FiberPort.
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Bulkhead
requirement.
The Bulkhead,
the threaded portion on which the Connector attaches,
is different in length for the two groups of Lenses
as listed below.
FiberPort Lenses LLO-PAF-2,5,7
can be interchanged using FCBH-S Bulkhead. Likewise,
LLO-PAF-11,15 use the FCBH-LA. When interchanging Lenses
from one group to another, it is not necessary to change
FiberPort bodies. It is only necessary to interchange
Bulkheads.
In summary,
interchanging Lenses and Bulkhead is simple, quick and
economical.
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¥ë: Specify wavelength
in nm.
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Lenses are easily
interchanged in FiberPort.
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OFR manufactures numerous, precision Optical Components
that can be easily inserted into the optical path, simply by plugging
the Component Module into the FiberBench of FiberTable. A Component
Module consists of an Optical Component mounted onto an intermediate
Stage Adapter. Precision, hardened steel dowel pins on the underside
of the Stage Adapter fit into receiving holes on the FiberBench
Base and FiberTable.
All Component Module Bases mount onto the
FiberBench via hardened, precision pins, and are then locked for
absolute stability.
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Empty
Component Bases
For applications
using non-OFR or loose optical components, empty Component
Bases are available. These are used on all standard
OFR Optical Component Modules.
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Four
Bases are available :
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HCB Fixed Base
for non-deviating components,
such as
parallel windows, filters, etc.
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RCB Rotating Base
for components requiring
rotation, such as
retarders, polarizers, etc. 3¢ªresolution.
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FCB Fixed Component
Base
for half-inch components,
such as Attenuating Filters,
and Aperture Plates.
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ACB 3-Axis Aiming
Base
for deviation compensation,
featuring ultra-stable
flexure joints. It is especially
significant because
it accommodates many different
components.
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50/50 Beamsplitters
An OFR Laser Beamsplitter plate, mounted on a
3-Axis Aiming Base, comprises the Beamsplitter Module.
These
produce a 50/50 split with unpolarized light within the wavelength
band specified. The beamsplitter coating is dielectric, and all
air surfaces are AR coated. When ordering, specify wavelength of
operation.
Beamsplitter Modules are intended for applications
requiring access to two or more output beams. Split ratios other
than 50/50 are available on special order.
Polarizing
Beamsplitters
An OFR Broadband Polarizing Beamsplitter prism
cube, mounted on a 3-Axis Aiming Base, comprises the Poarizing BeamsplitterModule.
This splits the collimated laser beam into its S and P polarized
components, with the S(vertical) component reflecting 90¢ªand the
P(horizontal) component continuing undeviated.
Separation of
polarization of the two components is > 1000:1 (30dB).
WDM Beamsplitters(dichroic) are available
on a custom basis.
Please inquire.
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Custom
1x4 Splitter
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Broadband PSP*
Beamsplitters * Polarization-State-Preserving
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In most fiber-optic
applications it is necessary to maintain the State of
Polarization (SOP) of light in the system. However,
if an ordinary beamsplitter is used, the SOP will be
changed. An "ordinary" beamsplitter is described
as a plate of glass at 45¢ª that reflects (S) and transmits
(P) incident light, whether coated or uncoated. This
is because this type of beamsplitter affects the SOP
of the S and Pbeams.
So-called "non-polarizing"beamsplitters
might maintain the S and P amplitudes, but not the phase
angle between them. In short, a non-polarigzing beamsplitter
does not maintain theSOP.
The
OFR PSP Beamsplitter
utilizes
unique and proprietary technology. It is the only beamsplitter
on the market that preserves the SOP of the input beam,
and is characterized by wide bandwidths (50-100nm) and
wide fields-of-view(¡Ã5¢ª). The PSP
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Beamsplitter
produces a 50/50 split within 3% for both
output beams, and preserves the SOP and
phase angle of the polarized components
of the input.
Other split ratios are
available on a custom basis. Please inquire.
A special PSP Beamsplitter with 4% reflection
and 96% transmission is used to sample the
optical beam for the purpose of mounting
power.
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¥ë: when ordering, specify
wavelength, for example PSP-50/50-IR2.
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Specifications
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. Rs=Ts=50%±3%
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Rp=Tp=50%±3%
. Bandwith:¥ëc±50-100nm
Custom ratios
available
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NOTE : some wavelegths
under
development
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PSP Beamsplitter
on
empty FiberTable.
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Polarizer
A Polarizer, mounted on a Component Base, comprises
the OFR Polarizer Module. Transmittance is >98% (insertion loss
<0.1dB) within the wavelength range specified, and the extinction
of a crossed pair is >104 (40 dB).
In addition to Polarizing Beamsplitters, two types
of Polarizers are stocked:
Linear Polarizers, mounted in RCB Rotating
Cell. These are dichroic type linear Polarizers with both sides
AR coated. Specify wavelength when ordering.
Walk-Off Polarizers, precision polished
calcite blocks, are specifically designed for construction of polarization
independent systems and other optical devices.
For complete separation
of S and P, beam diameter cannot exceed Clear Aperture, otherwise
overlap will occur.
The most common application of Walk-Off Polarizers
is in a 1x2 splitter configuration. See photos below.
These Polarizers
are capable of handling extremely high optical powers, and have
extremely wide bandwith and the highest polarization ratio of all
types of polarizers.
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Left
Handed
Walk-Off
Polarizer
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Right
Handed
Walk-Off
Polarizer
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¥×: specify Aperture
¥ë: specify
Wavelength
* PBB, for complete S and P beam separation,
beam diameter cannot exceed Clear Aperture.
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Medium FiberBench with
PBB Walk-Off Polarizers
and PCB Linear Polarizer
in RCB Rotating Cell.
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Variable 1x2 Splitter,
a Walk-Off Polarizer Application
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Retarders
An OFR Crystal Quartz Zero-Order or Achromatic
Retarder in a Rotating Base comprises the Retarder Module. 1/4-Wave
and 1/2-Wave Retarders are available for all standard laser wavelengths.
These Zero-Order retarders have the widest bandwidth(6nm) and highest
extinction potential(104-105) of all types of retarders.
In
order to function in as many applications as possible, the Retarders
are mounted in a Rotating Cell with engravedangle-index.
The
1/4-Wave Retarder produces circularly polarized light. It is used
with a 1/2-Wave Retarder to construct a Polarizationcontroller.
The 1/2-Wave Retarder is generally used to control rotation
of the plane of polarization.
OFR Retarders are manufactured
to the exact wavelength of intended use, and all surfaces are AR
coated. Therefore, when ordering, specify wavelength of operation.
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¥ë: when ordering, specify wavelength,
for example RZB-1/2-1310.
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Axis alignment into
PM fiber using
Half-Wave Retarder(RZB-1/2)
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Attenuators
An OFR Neutral
Density Filter, mounted in Fixed Component Base, comprises
the dB Attenuator Module. These are available in dB
attenuation steps of 3,6,10,20,30 and 40 dB.
Any
of these can be added in series to achieve higher attenuation
values. For example, 20dB plus 30 dB yield a total of
50dB. This is easily achieved by setting the Modules
onto the Component Stage.
Components are tilted to
prevent backrefection.
Both the FiberBench and FiberTable
are designed to accept several Modules.
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NOTE
: Order as FDB-20, for example.
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Long FiberBench with FDB Attenuator
Modules
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