Collimators

Laboratory Collimators

System Use and Description

The EOI LC series of high resolution, reflecting collimators are used to provide a collimated source of infrared and/or visible energy to a system under test. EOI's LC series of collimators offer high on axis performance with no obscuration and will accommodate a variety of sources at the focal plane.

Clear aperture diameters are available from 3 inches to 16 inches. EOI collimators are diffraction limited² in the mid IR band at ambient temperature range of 20 to 30°C.

EOI's standard collimators are Vis and IR rated with 1/8 wave at 633nm.

Options are available to allow testing over large temperature extremes. Either manual or motorized focus stages may be added to test sensors with adjustable range or focus.

Collimator with Blackbody and Target Wheel

The primary mirror surface is an off-axis, circular segment of a paraboloid. The primary is aluminized for high reflectivity with a SiO overcoated for durability. Gold Mirror Coating is available as an option. The flat folding mirror is coated with protected silver for best reflectivity at 45 degree incidence.

Collimators may be ordered with an EOI blackbody radiation source or differential temperature source mounted on the source support plate. If the blackbody is equipped with a target or aperture wheel, the target or aperture surface will be located at the focal plane.

EOI also offers modified or custom collimators, both reflective and refractive, to meet your requirements.

	Calculate the diffraction limited target frequency.
	Calculate target frequency or bar width for different focal lengths.

Dimension in Inches

Model	Clear¹ Aperture	Focal³ Length	Maximum⁴ Target Background	Field of View (Deg)
LC-03	3	15	0.5	2.0
LC-04	4	20	0.75	2.0
LC-05	5	25	1.0	2.0
LC-06	6	30	1.0	2.0
LC-08	8	40	1.5	2.0
LC-10	10	50	1.8	2.0
LC-12	12	60	2.0	2.0
LC-14	14	70	2.0	2.0
LC-16	16	80	2.0	2.0

Contact EOI for: Larger Sizes, Different Focal Lengths or Field of View

^{1 Clear aperture clear aperture clear
aperture is defined by on-axis radiation and the circular aperture at the front
plate of the collimator housing. Off-axis radiation will decrease the usable
aperture.
^{2 Note that the blur circle due to diffraction in
milliradians = 0.244 x wavelength in micrometers ÷ aperture diameter in
centimeters. An optical mirror is generally considered to be diffraction limited
if its surface does not depart from a perfect figure by more than 1/4 of the
wavelength of interest when measured peak to valley or approximately 1/19 of the
wavelength when measured as an rms error. Calculate
the diffraction limited target frequency.
³ Focal length is nominally 5 x Clear
Aperture or f-5.
⁴ Two inches is the standard EOI target
diameter. Contact EOI for larger target sizes.

How to Order

Select desired model; Example: Model LC-14 /AFM is a 14 inch clear aperture
system with a motorized focus stage.

This is data sheet EO663C.
Information regarding this data sheet and any requests for data sheets may be
directed to EOI at the link below.
Specifications subject to change.}}