Negligible coma, spherical, and astigmatic aberrations
Product Description
Newport Reflective Microscope
Objectives are reverse Cassegrains following the Schwardchild design.
Accordingly, they have zero chromatic aberration, and negligible coma,
spherical, and astigmatic aberrations. We offer 15X and 36X objectives,
broadband coated with aluminum and over coated with magnesium fluoride
(MgF2). They are usable from 200nm to
20mm. Special coatings are available upon
request including MgF2 optimized for
the 157 to 195nm region, and gold for the visible to IR region
Newport's reflective microscope objectives are fabricated
from a single material providing a uniform thermal
coefficient of expansion. Each objective contains two highly
polished electroless nickel spherical mirrors. The mirrors
are coated with aluminum and magnesium fluoride. Average
reflection per surface of each mirror is 85% in the UV-VIS,
and 90% in the IR (with a dip to 76% at 820nm).
The primary mirror has a spherical concave surface with a
center hole. The secondary mirror is a small convex
spherical mirror that is machined into the spider assembly.
The objectives are hand assembled in interferometric
alignment fixtures allowing each pair of mirrors to be
optimized as a set to achieve maximum resolution. Spot sizes
of 2 mm for the 15X objective and
1mm for the 36X objective are
typical.
How They Work
In a typical focusing application, collimated light passes
through the aperture hole in the primary mirror to the
secondary mirror. The secondary mirror reflects and diverges
the beam to fill the primary mirror. The primary mirror
focuses the beam to a small spot called the Object Plane or
Focal Point.
A) Diagram of a typical focusing
application of a reflective microscope objective
B) Illustration of the rear focal plane of a 160 mm back
focal length objective
Applications
UV Metrology and Microscopy
Spatial Filtering
Photomicroscopy
Laser Energy Delivery Systems
FT-IR Spectroscopy
Specifications
Model
Magnification
Numerical Aperture
BFL
(mm)
Working Distance
(mm)
Field of View
(mm)
Focal Length
(mm)
Obscuration
(%)
Secondary Mirror Diameter
(mm)
50105-01
15X
0.4
160
24.0
1.2
13.0
27
10.5
50105-02
15X
0.4
Infinite
24.0
1.2
13.0
27
10.5
50102-01
36X
0.52
160
10.4
0.5
5.4
17
5.6
50102-02
36X
0.52
Infinite
10.4
0.5
5.4
17
5.6
Typical reflectance curves of
metallic reflective coatings
Founded in 1969, Newport Corporation
is a pioneering single-source solutions provider of laser and
photonics components to the leaders in scientific research, life and health
sciences, microelectronics, industrial manufacturing, and homeland security markets.
