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BestForm Laser Lenses
OFR manufactures and maintains in stock its series of BestForm Laser Lenses. These are designed for minimum spherical aberration, and when not exceeding optimum beam diameter (see table below), will produce focal spots within diffraction-limit theory. These lenses can be used interchangeably for focusing, expanding or collimating.

Surface Quality
Polish exceeds 10-5 and sphericity better than 1/10-wave over the aperture at the design wavelength. All lenses are polished to the highest spherical figure and fineness consistent with optimum performance in all respects: minimum blur-circle, minimum wavefront distortion, minimum scattering loss, and maximum transmittance of energy.

Antireflection Coatings
All lenses are available with narrow-band or broadband antireflection coatings peaked for the major wavelength of operation, at which transmittance will exceed 99%. When ordering, add wavelength (in nm) as final dash number in Catalog Part Number. For example, LL-25-63-633, etc.

BestForm Laser Lenses are designed with minimum aberration ratio of the radii of both surfaces.

Mechanical Specifications
Diameter +0,-0.1 mm
Thickness 0.1 mm
Bevels 0.3 mm x 45
Radii 2%

LASER LENSES, 193 nm
OFR manufactures 193 nm Laser Lenses in two excimer-grades, CaF2 and fused silica. OFR feels that optical performance of either type should be equivalent. However, in spite of significant improvements in materials since the arrival of the ArF laser, limited performance data leave questions unanswered. Therefore, the choice of CaF2 or fused silica is open to interpretation. Please discuss with OFR.

LASER LENSES for ArF EXCIMER LASERS, 193 nm

Material:Excimer Grade CaF2
Design Wavelength 193 nm
Index at 193 nm 1.5045
CaF2 transmits 130nm-9.6µm
Material: Excimer Grade Fused Silica
Design Wavelength 193 nm
Index at 193 nm 1.5604
Fused Silica transmits 180nm-2.3µm

 

Antireflection Coating
Wavelength Bandwidth Avg. Reflectance Power Rating
193 nm ± 5 nm < 0.5% 400 MW/cm2

*Power rating based upon 20ns pulses, 20Hz

Excimer Grade Fused Silica (SiO2)

Catalog 
Number
Material
Diameter
Focal Length
at 193 nm
Optimum
Beam Dia.
Theoretical
Focal Spot
R1 mm
R2 mm
CT
LLU-13-17-193
FS*
" dia.
17.4 mm
2.1 mm
2.0 m
12.70
-38.89
3.5
LLU-13-17N-193
FS*
" dia.
-17.4 mm
2.1 mm
------
-12.70
44.62
2.5
LLU-13-22-193
FS*
" dia.
21.8 mm
2.5 mm
2.2 m
14.00
-79.99
3.5
LLU-13-22N-193
FS*
" dia.
-21.8 mm
2.5 mm
------
-14.6
79.99
2.5
LLU-13-35-193
FS*
" dia.
34.8 mm
4.4 mm
2.4 m
22.80
-121.45
3.5
LLU-13-35N-193
FS*
" dia.
-41.7 mm
4.4 mm
------
-22.80
141.32
2.5
LLU-25-55-193
FS*
1" dia.
54.8 mm
6.2 mm
2.7 m
36.24
-192.73
5.5
LLU-25-70-193
FS*
1" dia.
69.6 mm
7.3 mm
3.0 m
45.59
-265.14
5.5
LLU-25-87-193
FS*
1" dia.
87.0 mm
8.7 mm
3.1 m
57.23
-326.28
5.0
LLU-25-122-193
FS*
1" dia.
122.4 mm
11.1 mm
3.3 m
79.99
-471.01
5.0
LLU-25-165-193
FS*
1" dia.
165.3 mm
14.0 mm
3.6 m
111.60
-529.26
5.0
LLU-25-261-193
FS*
1" dia.
261.0 mm
19.7 mm
4.0 m
169.63
-1061.04
4.5

Other diameters and focal lengths available on custom basis. Please inquire.

* Excimer grade material; Inquire for uncoated lenses.

Fused Silica (SiO2)

Catalog 
Number
Material
Diameter
Focal Length
at 300 nm
Optimum
Beam Diameter
Theoretical
Focal Spot
R1 mm
R2 mm
CT
LLU-13-20-λ
UVFS
½" dia.
20.1 mm
2.6 mm
2.5 µm
12.70
-38.89
3.5
LLU-13-20N-λ
UVFS
½" dia.
-20.1 mm
2.6 mm
------
-12.70
44.62
2.5
LLU-13-25-λ
UVFS
½" dia.
24.7 mm
3.1 mm
2.6 µm
14.00
-79.99
3.5
LLU-13-25N-λ
UVFS
½" dia.
-25.1 mm
3.1 mm
------
-14.60
79.99
2.5
LLU-13-40--λ
UVFS
½" dia.
40.0 mm
4.4 mm
3.5 µm
22.80
-121.45
3.5
LLU-13-40N-λ
UVFS
½" dia.
-40.0 mm
4.4 mm
------
-22.80
141.32
2.5
LLU-25-63-λ
UVFS
1" dia.
63.0 mm
6.2 mm
3.9 µm
36.24
-192.73
5.5
LLU-25-63N-λ
UVFS
1" dia.
-62.2 mm
6.2 mm
------
-36.24
192.73
3.0
LLU-25-80-λ
UVFS
1" dia.
80.2 mm
7.3 mm
4.2 µm
45.59
-265.14
5.5
LLU-25-80N-λ
UVFS
1" dia.
-79.5 mm
7.3 mm
------
-45.59
265.14
3.0
LLU-25-100-λ
UVFS
1" dia.
100.2 mm
8.7 mm
4.3 µm
57.23
-326.28
5.0
LLU-25-100N-λ
UVFS
1" dia.
-99.6 mm
8.7 mm
------
-57.23
326.28
2.5
LLU-25-125-λ
UVFS
1" dia.
124.6 mm
10.2 mm
4.7 µm
73.10
-353.46
5.0
LLU-25-125N-λ
UVFS
1" dia.
-123.8 mm
10.2 mm
------
-73.10
356.46
3.0
LLU-25-140-λ
UVFS
1" dia.
140.5 mm
11.1 mm
4.8 µm
79.99
-471.01
5.0
LLU-25-140N-λ
UVFS
1" dia.
-139.9 mm
11.1 mm
------
-79.99
471.01
3.0
LLU-25-160-λ
UVFS
1" dia.
161.2 mm
12.3 mm
5.0 µm
90.13
-605.94
5.0
LLU-25-190-λ
UVFS
1" dia.
189.3 mm
14.0 mm
5.2 µm
111.60
-529.26
5.0
LLU-25-240-λ
UVFS
1" dia.
241.7 mm
16.6 mm
5.5 µm
136.75
-848.13
5.0
LLU-25-300-λ
UVFS
1" dia.
300.1 mm
19.7 mm
5.8 µm
169.63
-1061.04
4.5
LLU-25-300N-λ
UVFS
1" dia.
-299.3 mm
19.7 mm
------
-169.63
1061.04
4.5
LLU-25-380-λ
UVFS
1" dia.
381.5 mm
23.5 mm
6.2 µm
225.49
-1061.04
4.5
LLU-25-475-λ
UVFS
1" dia.
482.7 mm
23.5 mm
7.7 µm
235.56
Plano 
4.5
LLU-25-610-λ
UVFS
1" dia.
620.6 mm
23.5 mm
9.9 µm
302.85
Plano
4.5
LLU-25-760-λ
UVFS
1" dia.
789.8 mm
23.5 mm
12.3 µm
385.44
Plano
4.5
LLU-25-1000-λ
UVFS
1" dia.
965.2 mm
23.5 mm
16.2 µm
471.01
Plano
4.0
LLU-25-2000-λ
UVFS
1" dia.
2174.3 mm
23.5 mm
32.4 µm
1061 04
Plano
4.0
LLU-51-150-λ
UVFS
2" dia.
150.5 mm
11.9 mm
4.8 µm
84.82
-529.26
8.5
LLU-51-190-λ
UVFS
2" dia.
189.5 mm
14.0 mm
5.2 µm
111.60
-529.26
7.0
LLU-51-240-λ
UVFS
2" dia.
238.1 mm
16.6 mm
5.5 µm
136.75
-760.00
6.5
LLU-51-300-λ
UVFS
2" dia.
300.2 mm
19.7 mm
5.8 µm
169.63
-1061.04
6.5
LLU-51-380-λ
UVFS
2" dia.
381.2 mm
23.5 mm
6.2 µm
225.22
-1061.04
5.5
LLU-51-475-λ
UVFS
2" dia.
475.1 mm
27.8 mm
6.5 µm
260.90
-2068.17
5.5
LLU-51-610-λ
UVFS
2" dia.
611.6 mm
33.6 mm
6.9 µm
357.41
-1800
5.5
LLU-51-760-λ
UVFS
2" dia.
762.7 mm
39.5 mm
7.3 µm
438.93
-2440
5.0
LLU-51-1000-λ
UVFS
2" dia.
992.3 mm
48.5 mm
7.9 µm
484.25
Plano
5.0
Other diameters and focal lengths available on custom basis. Please inquire.

 

Excimer Grade Calcium Flouride (CaF2)

Catalog 
Number
Material
Diameter
Focal Length
at 193 nm
Optimum
Beam Dia.
Theoretical
Focal Spot
R1 mm
R2 mm
CT
LLV-13-20-193
CaF2*
½" dia.
20.2 mm
2.4 mm
2.0 µm
12.20
-55.80
3.5
LLV-13-20N-193
CaF2*
½" dia.
-20.0 mm
2.4 mm
------
-12.55
55.80
2.5
LLV-13-25-193
CaF2*
½" dia.
25.1 mm
2.8 mm
2.2 µm
14.00
-121.45
3.5
LLV-13-25N-193
CaF2*
½" dia.
-25.1 mm
2.8 mm
------
-14.60
100.03
2.5
LLV-13-40-193
CaF2*
½" dia.
39.9 mm
4.0 mm
2.7 µm
23.56
-132.5
3.5
LLV-13-40N-193
CaF2*
½" dia.
-40.3 mm
4.0 mm
------
-24.07
130.57
2.5
LLV-25-63-193
CaF2*
1" dia.
62.5 mm
5.6 mm
2.9 µm
37.85
-184.35
6.0
LLV-25-80-193
CaF2*
1" dia.
79.8 mm
6.6 mm
3.0 µm
47.65
-249.54
5.0
LLV-25-100-193
CaF2*
1" dia.
100.4 mm
7.9 mm
3.3 µm
58.07
-385.44
4.5
LLV-25-140-193
CaF2*
1" dia.
140.3 mm
10.1 mm
3.5 µm
81.50
-529.26
4.5
LLV-25-190-193
CaF2*
1" dia.
189.4 mm
12.7 mm
3.8 µm
109.13
-760.00
4.0
LLV-25-300-193
CaF2*
1" dia.
300.5 mm
17.9 mm
4.3 µm
176.66
-1061.04
4.0

Other diameters and focal lengths available on custom basis. Please inquire.

* Excimer grade material Inquire for uncoated lenses.

 

Calcium Flouride (CaF2)

Catalog 
Number
Material
Diameter
Focal Length
at 193 nm
Optimum
Beam Dia.
Theoretical
Focal Spot
R1 mm
R2 mm
CT
LLV-13-20
CaF2*
½" dia.
20.2 mm
2.4 mm
2.0 µm
12.20
-55.80
3.5
LLV-13-20N
CaF2*
½" dia.
-20.0 mm
2.4 mm
------
-12.55
55.80
2.5
LLV-13-25
CaF2*
½" dia.
25.1 mm
2.8 mm
2.2 µm
14.00
-121.45
3.5
LLV-13-25N
CaF2*
½" dia.
-25.1 mm
2.8 mm
------
-14.60
100.03
2.5
LLV-13-40
CaF2*
½" dia.
39.9 mm
4.0 mm
2.7 µm
23.56
-132.5
3.5
LLV-13-40N
CaF2*
½" dia.
-40.3 mm
4.0 mm
------
-24.07
130.57
2.5
LLV-25-63
CaF2*
1" dia.
62.5 mm
5.6 mm
2.9 µm
37.85
-184.35
6.0
LLV-25-80
CaF2*
1" dia.
79.8 mm
6.6 mm
3.0 µm
47.65
-249.54
5.0
LLV-25-100
CaF2*
1" dia.
100.4 mm
7.9 mm
3.3 µm
58.07
-385.44
4.5
LLV-25-140
CaF2*
1" dia.
140.3 mm
10.1 mm
3.5 µm
81.50
-529.26
4.5
LLV-25-190
CaF2*
1" dia.
189.4 mm
12.7 mm
3.8 µm
109.13
-760.00
4.0
LLV-25-300
CaF2*
1" dia.
300.5 mm
17.9 mm
4.3 µm
176.66
-1061.04
4.0

Other diameters and focal lengths available on custom basis. Please inquire.

* Excimer grade material

 

 

LASER LENSES for UV EXCIMER LASERS, 248 nm to 355 nm

Material: UV Grade Fused Silica
Design Wavelength: 300nm
Index @ 300nm
UV FS Trans.: 180nm - 2.3 µm

Wavelength
Focal Length
Corrector
248 nm
- 4%
300 nm
--
355 nm
+ 2%
Laser
λ
Nd: YAG 213 nm
KrF 248 nm
Nd: YAG 266 nm
XeCl 308 nm
HeCd 325 nm
N2 337 nm
XeF 351 nm
Nd: YAG 355 nm

 

BROADBAND AR COATINGS
Description
Bandwidth
Avg. Reflectance
Power Rating*
UVB
240 - 360 nm
< 0.5%
200 MW/cm2
NUV
325 - 500 nm
< 0.5%
200 MW/cm2
*Power rating based upon 20ns pulses, 20Hz.

NARROWBAND AR COATINGS
Specify λ
between
Bandwidth at
5% of peak
Avg. Reflectance
Power Rating*
213 - 355 nm
~ 8%
< 0.2%
500 MW/cm2
*Power rating based upon 20ns pulses, 20Hz.

For AR coating when ordering, insert AR coating at λ, for example,
LLU-25-100-UVB or LLU-25-140-248.

Catalog 
Number
Material
Diameter
Focal Length
at 300 nm
Optimum
Beam Diameter
Theoretical
Focal Spot
R1 mm
R2 mm
CT
LLU-13-20-λ
UVFS
½" dia.
20.1 mm
2.6 mm
2.5 µm
12.70
-38.89
3.5
LLU-13-20N-λ
UVFS
½" dia.
-20.1 mm
2.6 mm
------
-22.70
44.62
2.5
LLU-13-25-λ
UVFS
½" dia.
24.7 mm
3.1 mm
2.6 µm
14.00
-79.99
3.5
LLU-13-25N-λ
UVFS
½" dia.
-25.1 mm
3.1 mm
------
-14.60
79.99
2.5
LLU-13-40--λ
UVFS
½" dia.
40.0 mm
4.4 mm
3.5 µm
22.80
-121.45
3.5
LLU-13-40N-λ
UVFS
½" dia.
-40.0 mm
4.4 mm
------
-22.80
141.32
2.5
LLU-25-63-λ
UVFS
1" dia.
63.0 mm
6.2 mm
3.9 µm
36.24
-192.73
5.5
LLU-25-63N-λ
UVFS
1" dia.
-62.2 mm
6.2 mm
------
-36.24
192.73
3.0
LLU-25-80-λ
UVFS
1" dia.
80.2 mm
7.3 mm
4.2 µm
45.59
-265.14
5.5
LLU-25-80N-λ
UVFS
1" dia.
-79.5 mm
7.3 mm
------
-45.59
265.14
3.0
LLU-25-100-λ
UVFS
1" dia.
100.2 mm
8.7 mm
4.3 µm
57.23
-326.28
5.0
LLU-25-100N-λ
UVFS
1" dia.
-99.6 mm
8.7 mm
------
-57.23
326.28
2.5
LLU-25-125-λ
UVFS
1" dia.
124.6 mm
10.2 mm
4.7 µm
73.10
-353.46
5.0
LLU-25-125N-λ
UVFS
1" dia.
-123.8 mm
10.2 mm
------
-73.10
356.46
3.0
LLU-25-140-λ
UVFS
1" dia.
140.5 mm
11.1 mm
4.8 µm
79.99
-471.01
5.0
LLU-25-140N-λ
UVFS
1" dia.
-139.9 mm
11.1 mm
------
-79.99
471.01
3.0
LLU-25-160-λ
UVFS
1" dia.
161.2 mm
12.3 mm
5.0 µm
90.13
-605.94
5.0
LLU-25-190-λ
UVFS
1" dia.
189.3 mm
14.0 mm
5.2 µm
111.60
-529.26
5.0
LLU-25-240-λ
UVFS
1" dia.
241.7 mm
16.6 mm
5.5 µm
136.75
-848.13
5.0
LLU-25-300-λ
UVFS
1" dia.
300.1 mm
19.7 mm
5.8 µm
169.63
-1061.04
4.5
LLU-25-300N-λ
UVFS
1" dia.
-299.3 mm
19.7 mm
------
-169.63
1061.04
4.5
LLU-25-380-λ
UVFS
1" dia.
381.5 mm
23.5 mm
6.2 µm
225.49
-1061.04
4.5
LLU-25-475-λ
UVFS
1" dia.
482.7 mm
23.5 mm
7.7 µm
235.56
Plano 
4.5
LLU-25-610-λ
UVFS
1" dia.
620.6 mm
23.5 mm
9.9 µm
302.85
Plano
4.5
LLU-25-760-λ
UVFS
1" dia.
789.8 mm
23.5 mm
12.3 µm
385.44
Plano
4.5
LLU-25-1000-λ
UVFS
1" dia.
965.2 mm
23.5 mm
16.2 µm
471.01
Plano
4.0
LLU-25-2000-λ
UVFS
1" dia.
2174.3 mm
23.5 mm
32.4 µm
1061 04
Plano
4.0
LLU-51-150-λ
UVFS
2" dia.
150.5 mm
11.9 mm
4.8 µm
84.82
-529.26
8.5
LLU-51-190-λ
UVFS
2" dia.
189.5 mm
14.0 mm
5.2 µm
111.60
-529.26
7.0
LLU-51-240-λ
UVFS
2" dia.
238.1 mm
16.6 mm
5.5 µm
136.75
-760.00
6.5
LLU-51-300-λ
UVFS
2" dia.
300.2 mm
19.7 mm
5.8 µm
169.63
-1061.04
6.5
LLU-51-380-λ
UVFS
2" dia.
381.2 mm
23.5 mm
6.2 µm
225.22
-1061.04
5.5
LLU-51-475-λ
UVFS
2" dia.
475.1 mm
27.8 mm
6.5 µm
260.90
-2068.17
5.5
LLU-51-610-λ
UVFS
2" dia.
611.6 mm
33.6 mm
6.9 µm
357.41
-1800
5.5
LLU-51-760-λ
UVFS
2" dia.
762.7 mm
39.5 mm
7.3 µm
438.93
-2440
5.0
LLU-51-1000-λ
UVFS
2" dia.
992.3 mm
48.5 mm
7.9 µm
484.25
Plano
5.0
Other diameters and focal lengths available on custom basis. Please inquire.

Optics for Research · Ph 973-228-4480 · Fax 973-228-0915 · Email: info@ofr.com
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