Ocean Optics 74-VIS Instructions

Collimating lenses

74-UV, 74-VIS Collimating

Lenses Instructions

Description

To obtain accurate data, the light entering the sample and the light collected after exiting the sample

must be well collimated. The 74-UV and 74-VIS collimating lenses screw onto the end of SMA-

terminated optical fibers and other sampling optics to convert divergent beams of radiation (light) into

a parallel beam.

Collimating lenses are useful for any optical setup that requires the acceptance or transmission of

parallel beams of light at the illumination source, at the entrance optics, or at both ends (illumination

and read) of the setup. That's important because the optical fibers Ocean Optics specifies for use with

its spectrometers and light sources have a field of view (FOV) of ~25° -- an acceptance angle that may

not be appropriate for some experiments. Collimating lenses are adjustable, providing FOV angles

from collimation (near 0°) to ~45°. Without the collimating lenses, the light would disperse more than

is required for efficient transmission and collection of the signal.

Using a collimating lens is easy. Screw a collimating lens onto the end of any SMA-terminated port to

collect, shape, or focus light.

All collimating lenses are already adjusted at the time of manufacture such that light emerging from a

200 µm fiber/collimating lens assembly is collimated. To readjust the focus of light so that accurate

data is collected by the spectrometer, use the following procedure.

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1. Connect the fiber that you are going to use as the illumination fiber in your setup to the light

source. Ensure the connection is tight. The female SMA connector of the fiber must be

screwed all the way into the male connector of the lamp.

CL-10000-000-05-201406

Table of Contents

Do you have a question about the 74-VIS and is the answer not in the manual?

Page 1 To obtain accurate data, the light entering the sample and the light collected after exiting the sample must be well collimated. The 74-UV and 74-VIS collimating lenses screw onto the end of SMA- terminated optical fibers and other sampling optics to convert divergent beams of radiation (light) into a parallel beam.
Page 2 Collimating Lenses Instructions 2. Turn on the lamp and inspect the light beam emitted from the other end of the fiber by pointing the fiber at a light-colored object such as a white piece of paper. The distance is not too critical but should be at least 3 inches from the surface.

74-uv