4 Laser Beam Steering Unit The laser beam is reflected
off the mirror on to a surface or target behind the laser head. By increasing the distance
of your target from the wheel, increases the accuracy. The principles are involved
regardless of whether one is scanning the beam for a confocal laser system or moving an
optical trap. One particularly convenient plane to use is the eyepoint, where rays of
light focused in the image plane are parallel. This scheme is used by several commercial
scanning confocal microscopes to scan the laser spot. A single-beam optical trap, or
optical tweezers, uses highly focused laser light to grab and manipulate microscopic
objects .Optical tweezers derives its unique trapping capability from the
three-dimensional gradient in light intensity found near a focus.Another form of radiation
pressure, usually called the scattering force, arises from reflection or absorption of
light, and it tends to push objects down along the beam, in the direction of propagation
of the light, much as a stream of water from a fire hose propels objects away from the
nozzle.Three-dimensional trapping takes place when the effect of gradient force is
sufficiently large to overcome the fire hose effect of the scattering force. |
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4 XYZ Fiber Holder This system allows light to be transmitted and
collected reliably and reapeatably with secure knowledge of a low loss launch. This System
provides an excellent way to characterize specialty fibers.The Characterization System is
highly configurable, fibers of different length and fiber mounts poses no difficulty. All
feature our high resolution fixed body differential adjusters and are ideal for optimizing
the coupling of a free space laser into a single mode fiber or polarization maintaining
fiber. The three adjusters are completely decoupled from the moving platform of the stage
and therefore eliminate any unwanted movement caused by leverage from the actuators during
use. The intrinsic stiffness and resultant stability of our flexure system, as compared to
a linear bearing design, provides superior performance during the initial alignment of the
system as well as its long term operation. The advantages are a direct result of the
system being comprised of one structure that flexes as opposed to being made from a series
of independent moving parts. The resolution is ensured through the unique combination of
our high performance dual stage micrometers and the parallel flexure mechanism that
provides a true nanopositioning capability. |
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4 Large Aperture Mirror Mount for PiezoDriver
These are contributions of a laser systems and components that are
strange, unusual, or unidentified, or have other interesting characteristics.The advantage
of the piezoelectric fine adjustment is based on the extremely high resolution,
responsiveness and electrical controllability. Large convex aspheres are notoriously
difficult to fabricate because of the tremendous cost and difficulty of making accurate
measurements of the optical surfaces. Two powerful measurement techniques have been
implemented at the Mirror Lab and demonstrated to be accurate and economical. The polished
surfaces are interferometrically measured using holographic test plates.When supported a
few millimeters from the secondary and properly illuminated with laser light, an
interference pattern is formed that shows the secondary surface errors. The hologram
consists of annular rings of metal drawn onto the curved test plate surface using a
custom-built writing machine. In addition to this test, a swing arm profilometer was built
to measure the rough surface during aspherization and loose abrasive grinding. |
