A laser beam imaged through a normal focusing lens would form a curved plane. In a scanning application, it is desirable to form a flat image plane. The F theta lens is designed so that the focused spot is dependent on the focal length and the input beam deflection angle. Our F theta lens are designed to work with one or two mirror scan systems.
Most lenses include a replaceable protective window. All scan lens are optimized and coated for a specific wavelength. Our lenses can be used for different lasers from continuous wave to ultra short pulse lasers in the femto-second range. The lenses are designed to eliminate internal reflection ghost images.
The aperture stop distance is the suggested location where the scan mirrors should be placed symmetrically around the len in order to obtain optimal performance. In a one mirror system, this value is the position of the scan mirror. The calculation of the scan length and scan areas of our f-theta lenses are based on the geometrical design of typical scan systems with a certain mirror spacing. The values given assume a vignetting of less than 1%. If used with non-typical scan systems or with scan systems which have been designed for larger or smaller laser beams, different scan lengths and scan areas will result.
Lens Specifications
|
Model |
Diameter
(mm) |
Focal Length
(mm) |
Wavelength
(nm) |
Aperture Stop
(mm) |
Working Distance
(mm) |
Length
(mm) |
Maximum Angle of Incidence |
Transmission |
Material |
Weight
(kg) |
| 10FTL-1064
|
89 |
162.41 |
1064 |
22.03 |
181.08 |
43.3 |
15.0 ˚ |
T > 97% at 1064 nm |
glass |
0.29 |
| 15FTL-1064
|
109 |
254.38 |
1064 |
23.5 |
306.26 |
55.3 |
14.9 ˚ |
T > 96% at 1064 nm |
glass |
0.66 |
| 10FTL-532
|
106 |
162.81 |
532 |
28.0 |
186.47 |
46.58 |
14.7 ˚ |
T > 97% at 532 nm |
glass |
0.29 |
| 15FTL-532
|
109 |
233.47 |
532 |
24.7 |
281.98 |
55.3 |
14.3 ˚ |
T > 93% at 532 nm |
glass |
0.66 |
| 15FSTL-1064
|
105 |
277.1 |
1064 |
31.0 |
346.07 |
61.0 |
11.3 ˚ |
T > 97% at 1064 nm |
fused silica |
0.9 |
| 15FSTL-532
|
105 |
259.91 |
532 |
26.0 |
325.41 |
61.0 mm |
13.5 ˚ |
T > 97% at 532 nm |
fused silica |
0.88 |
| FTL-355
|
89 |
173.9 |
355 |
21.1 |
218.4 |
36.75 |
13.3 ˚ |
T > 98% at 355 nm |
fused silica |
0.36 |
| FSTL-355
|
105 |
250.26 |
355 |
28.05 |
309.62 |
61.0 |
13.2 ˚ |
T > 97% at 355 nm |
fused silica |
0.88 |
| SPFTL-1064
|
89 |
163.03 |
1064 |
27 |
197.07 |
44.0 |
11.2 ˚ |
T > 97% at 1064 nm |
fused silica |
0.9 |
Scan Specifications
|
Model |
Wavelength
(nm) |
Scan Angle |
Scan Length
(mm) |
Scan Area |
Max. input beam diameter |
Damage Threshold |
Mounting |
| 10FTL-1064
|
1064 |
± 26.8 ˚ |
153.84 mm |
107 x 107 mm2 |
12.0 |
5.0 J/cm2 per 1 ns pulse at 50 Hz, 5.0 GW/cm2 CW |
M85 x 1 |
| 15FTL-1064
|
1064 |
± 25.6 ˚ |
226.91 mm |
160 x 160 mm2 |
12.0 |
5.0 J/cm2 per 1 ns pulse at 50 Hz, 5.0 GW/cm2 CW |
M85 x 1 |
| 10FTL-532
|
532 |
± 30.0 ˚ |
177.66 mm |
120 x 120 mm2 |
10.0 |
2.5 J/cm2 per 1 ns pulse at 50 Hz, 2.5 GW/cm2 CW |
M85 x 1 |
| 15FTL-532
|
532 |
± 26.0 ˚ |
210.9 mm |
148 x 148 mm2 |
10.0 |
2.5 J/cm2 per 1 ns pulse at 50 Hz, 2.5 GW/cm2 CW |
M85 x 1 |
| 15FSTL-1064
|
1064 |
± 21.4 ˚ |
205.6 mm |
142 x 142 mm2 |
15.0 |
5.0 J/cm2 per 1 ns pulse at 50 Hz, 5.0 GW/cm2 CW |
M85 x 1 |
| 15FSTL-532
|
532 |
± 25.8 ˚ |
231.03 mm |
162 x 162 mm2 |
10.0 |
2.5 J/cm2 per 1 ns pulse at 50 Hz, 2.5 GW/cm2 CW |
M85 x 1 |
| FTL-355
|
355 |
± 25.0 ˚ |
153.15 mm |
109 x 109 mm2 |
6.0 |
1.0 J/cm2 per 1 ns pulse at 50 Hz, 1.0 GW/cm2 CW |
M85 x 1 |
| FSTL-355
|
355 |
± 25.4 ˚ |
219.17 mm |
155 x 155 mm2 |
10.0 |
1.0 J/cm2 per 1 ns pulse at 50 Hz, 1.0 GW/cm2 CW |
M85 x 1 |
| SPFTL-1064
|
1064 |
± 24.4 ˚ |
138.06 mm |
95 x 95 mm2 |
10.0 |
5.0 J/cm2 per 1 ns pulse at 50 Hz, 5.0 GW/cm2 CW |
M85 x 1 |
All scan lenses have M85x1 mounting thread and comes with a protective window.
