Ocean Optics S2000 - Manual (Page 75)

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.
For directions on adjusting the focus of a collimating lens, see Appendix B .
Specifications
Sampling Optics: 74-UV, 74-VIS
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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.