Ocean Optics Collimating Lenses - Manual

74-UV, 74-VIS Collimating Lenses
In order 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 C
OLLIMATING L ENSES screw onto the end of SMA-terminated optical
fibers and other sampling optics to convert divergent beams of radiation (light) into a parallel beam.
Application Tips
! Using a collimating lens is easy. Screw a collimating lens onto the end of any SMA-terminated port to collect,
shape, or focus light.
! 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.
Specifications
Adjusting the Focus for Collimating Lenses
In order to obtain accurate data, the light entering and exiting a sample by means of a fiber/collimating lens
assembly must be well collimated. The following is a description of how to adjust the focus of light so that
accurate data is collected by the spectrometer. (All collimating lenses are already adjusted at the time of
manufacture such that light emerging from a 200
µ m fiber/collimating lens assembly is collimated.)
Adjust the focus of the collimating lens on your light source.
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.
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. Loosen the set screw on the fiber barrel of the light source with an Allen wrench.
Operating Instructions: Collimating Lenses
Lens diameter: 5 mm
Lens length: 10 mm
f-number: f/2
74-UV material: Dynasil 1100 quartz (200 nm - 2 µ m*)
74-VIS material: BK 7 glass (360 nm - 2 µ m*)
Lens barrel: stainless steel with black oxide finish
Threads: UNC 3/8-24
* Though the product can be used to 2
µ
m, it can be configured to "see" only to 1100 nm with our S2000
spectrometer.
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