Layout 3
Mid-IR Focusing Objectives
2 µm to 12 µm
Fiber-Optic Coupling Lenses
innpho’s Mid-IR Focusing Objectives are designed
to provide maximum coupling efficiency in coupling
the output from a mid-IR source into single-mode or
multimode IR transmitting fibers.
Catalog
Number
LFO-5-6-␭
LFO-5-12-␭
LFO-5-18-␭
Clear
Aperture
5 mm
5 mm
5 mm
Design Features
Maximum Coupling Efficiency
❏ NA match to fiber NA
❏ Focal Spot smaller than fiber core diameter
❏ ZnSe Lens AR coated at designated wavelengths
❏ Lens Design: micro aspheric, diffraction limited
Easy Alignment
❏ Using HeNe or other visible laser
❏ Long Working Distance where possible
Ease of Mounting, 2 standard mounting options:
❏ Microscope Objective Cell with industry standard
RMS thread
❏ 1" dia x ¼" black anodized plate
❏ Other mounting options on special order
Numerical
Aperture
0.25
0.13
0.08
Working
Distance
5.3 mm
11.5 mm
17.5 mm
Focal
Length
6 mm
12 mm
18 mm
When ordering, specify wavelength. For example, LFO-5-6-4.75
Focal Spot (µm) Objective Focal Lengths 6mm, 12mm, 18mm
Beam
Diameter
2.0 mm
2.5 mm
3.0 mm
4.0 mm
5.0 mm
Focal Length
6 mm 12 mm 18 mm
15
30
46
12
24
37
14
20
30
32
15
23
63
16
18
Wavelength 4 µm
Focal Length
6 mm 12 mm 18 mm
23
46
69
18
37
55
15
30
46
32
23
34
63
18
27
Wavelength 6 µm
Focal Length
6 mm 12 mm 18 mm
30
61
91
24
49
73
20
41
61
32
30
46
63
24
37
Wavelength 8 µm
ANTIREFLECTION COATINGS
Typical Reflectance at wavelengths shown.
␭ Spread
Center
Reflectance
Wavelength
at Center ␭
at R = 1%
3.75 µm
~0.20%
(3.25-4.25) µm
4.75 µm
<0.25%
(4.25-5.5) µm
8.5 µm
~0.25%
(7.5-9.5) µm
62 Depot St., Verona, NJ 07044 / ph: 973-857-8380 / fx: 973-857-8381
www.innpho.com / [email protected]
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