F-Theta Lenses
Avantier designs and produces high-performance custom and stock F-theta lenses for laser scanning, engraving, and cutting systems, serving a wide range of clients.
An F-theta lens, also known as a plane field objective or scan lens, is an assembly of three or four lenses, pre-aligned and mounted in a rigid housing for direct integration. Standard focusing lenses form an image on a curved surface; an F-theta lens corrects this to deliver a flat focal plane. Spot size remains nearly constant across the entire scan field, and the laser spot position scales linearly with scan angle—properties that make F-theta lenses essential for precision laser scanning, engraving, and cutting applications.
F-Theta Lens Custom Manufacturing Specifications
Lens Design |
Compact design with 3 to 4 elements |
Transmittance |
>90% |
Distortion (Max.) |
<0.25% |
Focal Length |
Available from 63mm to 635mm |
Custom Optical Coating |
Working wavelength range from UV to visible to infrared |
Lens Performance |
Customized to fit specific application needs |
Stock F-Theta Lenses
Avantier’s stock F-theta lenses are built for laser scanning, engraving, and cutting applications. Each assembly houses three or four pre-aligned lenses in a rigid mount, delivering constant spot size across the scan field and linear spot-to-angle proportionality.
Stock assemblies ship with customizable mounts and adapters, offering shorter lead times and lower cost than custom designs.
| Part Number | WL (nm) | EFL (mm) | Scanning Width (mm x mm) | PD (mm) | Scan Angle (⁰) | TA (⁰) | Mounting Threads | WorkingDistance (mm) | M1-M2 Distance (mm) | M2-Lens Center (mm) | Focal Spot Diameter (μm) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AVTFT-1001 | 343 | 330 | 200 x 200 | 14.0 | ±24.7 | 4.00 | M85×1 | 441.54 | 16.42 | 24.880 | 14.6-15 |
| AVTFT-1002 | 343 | 370 | 200 x 200 | 14.0 | ±22.5 | 7.00 | M85×1 | 527.34 | 17.00 | 33.000 | 16.0-18.0 |
| AVTFT-1003 | 355 | 100 | 70 x 70 | 12.0 | ±28.8 | 4.00 | M85×1 | 123.41 | 13.00 | 23.950 | 20-58 |
| AVTFT-1004 | 355 | 32 | 6 x 6 | 10.0 | ±7.6 | 4.00 | M85×1 | 28.2 | 13.00 | 14.300 | 2.10-2.14 |
| AVTFT-1005 | 355 | 32 | 8 x 8 | 10.0 | ±10.2 | 4.00 | M39×1 | 19.3 | 13.00 | 13.500 | 2.2-2.5 |
| AVTFT-1006 | 355 | 50 | 20 x 20 | 5.0 | ±16.5 | 3.00 | M55×1 | 28.19 | 18.60 | 19.100 | 6.4-6.9 |
| AVTFT-1007 | 355 | 56 | 18 x 18 | 6.0 | ±15 | 4.00 | M85×1 | 73.84 | 18.00 | 19.500 | 4.0-6.0 |
| AVTFT-1008 | 355 | 60 | 18 x 18 | 6.0 | ±12.3 | 4.00 | M55×1 | 62.61 | 13.00 | 18.500 | 4.5-5.0 |
| AVTFT-1009 | 355 | 80 | 35 x 35 | 6.0 | ±19 | 3.00 | M55×1 | 104.46 | 13.00 | 17.000 | 8.5-9.0 |
| AVTFT-1010 | 355 | 100 | 35 x 35 | 10.0 | ±14.4 | 4.00 | M55×1 | 131.95 | 16.00 | 33.270 | 6.56-7.18 |
| AVTFT-1011 | 355 | 100 | 60 x 60 | 6.0 | ±25 | 4.00 | M85×1 | 143.3 | 20.00 | 19.000 | 14-30 |
| AVTFT-1012 | 355 | 103 | 50 x 50 | 9.0 | ±20.2 | 2.50 | M85×1 | 135.8 | 14.00 | 23.550 | 7.0-8.0 |
| AVTFT-1013 | 355 | 109 | 63 x 63 | 6.0 | ±24.2 | 16.00 | M85×1 | 146.3 | 13.00 | 31.590 | 11.0-17.0 |
| AVTFT-1014 | 355 | 163 | 90 x 90 | 10.0 | ±25 | 4.30 | M85×1 | 221.7 | 16.00 | 33.000 | 9.72-15.6 |
| AVTFT-1015 | 355 | 163 | 90 x 90 | 10.0 | ±25 | 4.00 | M85×1 | 217.81 | 16.00 | 33.000 | 10.0-13.5 |
| AVTFT-1016 | 355 | 170 | 100 x 100 | 10.0 | ±25 | 5.00 | M85×1 | 238.1 | 13.00 | 17.500 | 11.0-13.0 |
| AVTFT-1017 | 355 | 360 | 160 x 160 | 10.0 | ±18.5 | 0.50 | M85×1 | 440.7 | 13.00 | 29.500 | 23.0-24.0 |
| AVTFT-1018 | 405 | 55 | 30 x 30 | 6.0 | ±16 | 4.00 | M55×1 | 59.47 | 10.00 | 13.870 | 6.8-10.4 |
| AVTFT-1019 | 515 | 80 | 30 x 30 | 12.0 | ±15.6 | 1.70 | M55×1 | 80.6 | 16.00 | 22.870 | 6.4-7.0 |
| AVTFT-1020 | 515 | 200 | 140 x 140 | 10.0 | ±28.9 | 1.00 | M85×1 | 263.9 | 16.00 | 26.000 | 19.6-20.6 |
| AVTFT-1021 | 532 | 58 | 15 x 15 | 10.0 | ±10.4 | 4.00 | M55×1 | 52.64 | 20.00 | 18.000 | 4.0-5.0 |
| AVTFT-1022 | 532 | 100 | 36 x 36 | 16.0 | ±14.6 | 1.20 | M55×1/M85×1 | 114.66 | 13.69 | 24.000 | 6.0-6.2 |
| AVTFT-1023 | 532 | 100 | 40 x 40 | 10.0 | ±25 | 1.00 | M85×1 | 135.76 | 13.69 | 23.160 | 8.7-8.8 |
| AVTFT-1024 | 532 | 100 | 53 x 53 | 15.0 | ±25 | 3.20 | M85×1 | 127.43 | 18.00 | 25.000 | 7.0-10.0 |
| AVTFT-1025 | 532 | 100 | 70 x 70 | 10.0 | ±29.2 | 3.00 | M85×1 | 125.18 | 13.00 | 37.400 | 10.0-14.0 |
| AVTFT-1026 | 532 | 100 | 70 x 70 | 14.0 | ±25 | 3.00 | M85×1 | 93.03 | 16.42 | 40.000 | 7.0-11.6 |
| AVTFT-1027 | 532 | 105 | 60 x 60 | 10.0 | ±23.5 | 3.00 | M85×1 | 129.1 | 24.00 | 20.000 | 8.0-11.0 |
| AVTFT-1028 | 532 | 125 | 70 x 70 | 15.0 | ±25 | 2.00 | M85×1 | 161.78 | 19.40 | 26.000 | 7.0-7.0 |
| AVTFT-1029 | 532 | 150 | 60 x 60 | 15.0 | ±17 | 3.00 | —— | 79.5 | 22.11 | 33.440 | 9.6-10.0 |
| AVTFT-1030 | 532 | 163 | 75 x 75 | 10.0 | ±18.9 | 1.30 | M85×1 | 167.2 | 30.00 | 28.000 | 16.0-17.0 |
| AVTFT-1031 | 532 | 163 | 90 x 90 | 10.0 | ±25 | 4.80 | M85×1 | 219.5 | 16.00 | 19.500 | 16.0-20.0 |
| AVTFT-1032 | 532 | 200 | 140 x 140 | 10.0 | ±28.9 | 1.00 | M85×1/M143×2 | 263.9 | 16.00 | 26.000 | 19.6-20.6 |
| AVTFT-1033 | 633 | 160 | 75 x 75 | 10.0 | ±19.1 | 3.00 | M85×1 | 212 | 13.00 | 35.500 | 19.0-19.0 |
| AVTFT-1034 | 1064 | 56 | 10 x 10 | 20.0 | ±7.2 | 1.00 | M55×1 | 23.87 | 26.00 | 28.740 | 5-11 |
| AVTFT-1035 | 1064 | 100 | 50 x 50 | 10.0 | ±21 | 3.00 | M85×1 | 126.11 | 20.00 | 18.000 | 17-19 |
| AVTFT-1036 | 980 | 210 | 120 x 120 | 20.0 | ±4 | 3.00 | M148×0.75 | —— | 16.40 | 20.000 | —— |
| AVTFT-1037 | 1064 | 56 | 18 x 18 | 10.0 | ±13.3 | 1.00 | M55×1/M39×1 | 59.35 | 20.00 | 19.000 | 7.6-9 |
| AVTFT-1038 | 1064 | 56 | 20 x 20 | 10.0 | ±13 | 2.60 | M85×1 | 59.85 | 20.00 | 19.000 | 8.5-11.5 |
| AVTFT-1039 | 1064 | 82 | 20 x 20 | 15.0 | ±10 | 3.00 | M85×1 | 85.03 | 26.00 | 26.000 | 10.0-11.0 |
| AVTFT-1040 | 1064 | 100 | 50 x 50 | 10.0 | ±21 | 1.90 | M85×1 | 126.11 | 20.00 | 18.000 | 19.0-21.0 |
| AVTFT-1041 | 1064 | 100 | 50 x 50 | 15.0 | ±21.3 | 3.00 | M85×1 | 131 | 25.60 | 23.640 | 13-20 |
| AVTFT-1042 | 1064 | 100 | 55 x 55 | 15.0 | ±25 | 3.00 | M85×1 | 120.79 | 20.00 | 32.000 | 13-20 |
| AVTFT-1043 | 1064 | 107 | 60 x 60 | 10.0 | ±23.6 | 1.70 | M79×1 | 135.68 | 12.54 | 35.730 | 20.0-21.0 |
| AVTFT-1044 | 1064 | 108 | 69 x 69 | 12.0 | ±27 | 1.70 | M85×1 | 131.19 | 16.00 | 38.810 | 17.4-19.0 |
| AVTFT-1045 | 1064 | 109 | 50 x 50 | 14.0 | ±19.3 | 2.60 | M85×1 | 147.35 | 17.00 | 28.000 | 25.0-30.0 |
| AVTFT-1046 | 1064 | 115 | 50 x 50 | 14.0 | ±18.11 | 2.60 | M85×1 | 81.26 | 19.24 | 37.000 | 15.4-16.8 |
| AVTFT-1047 | 1064 | 115 | 50 x 50 | 14.0 | ±18.11 | 2.60 | M85×1 | 81.26 | 19.24 | 37.000 | 15.4-16.8 |
| AVTFT-1048 | 1064 | 125 | 70 x 70 | 15.0 | ±25 | 2.00 | M85×1 | 162.11 | 19.40 | 26.000 | 12-15 |
| AVTFT-1049 | 1064 | 163 | 73 x 73 | 10.0 | ±19 | 0.95 | M85×1 | 193.4 | 16.00 | 50.300 | 22-23.5 |
| AVTFT-1050 | 1064 | 163 | 90 x 90 | 15.0 | ±25 | 5.60 | M85×1 | 209.6 | 16.00 | 30.000 | 25.0-40.0 |
| AVTFT-1051 | 1064 | 163 | 90 x 90 | 15.0 | ±23 | 4.50 | M85×1 | 211.06 | 16.00 | 22.300 | 21.0-25.0 |
| AVTFT-1052 | 1064 | 180 | 80 x 80 | 10.0 | ±25 | 2.60 | M85×1 | 259.43 | 14.00 | 33.000 | 35.0-40.0 |
| AVTFT-1053 | 1064 | 190 | 90 x 90 | 18.0 | ±14 | 1.00 | M85×1 | 166.38 | 20.00 | 20.000 | 22.0-31.0 |
| AVTFT-1054 | 1064 | 100 | 37 x 37 | 25.0 | ±15.3 | 1.40 | M85×1 | 70.16 | 36.00 | 29.000 | 7.0-9.0 |
| AVTFT-1055 | 1064 | 216 | 126 x 126 | 15.0 | ±23.6 | 1.00 | —— | 298 | 21.00 | 33.000 | 30.0-31.0 |
| AVTFT-1056 | 1064 | 220 | 140 x 140 | 15.0 | ±25 | 1.00 | M100×1 | 289.9 | 16.00 | 29.020 | 28-29 |
| AVTFT-1057 | 1064 | 420 | 150 x 150 | 14.0 | ±20 | 5.00 | M85×1 | 636.44 | 16.50 | 35.000 | 50.0-52.0 |
| AVTFT-1058 | 1064 | 210 | 50 x 50 | 25.0 | ±8.8 | 1.00 | M85×1 | —— | 40.00 | 25.000 | 16.4-18.1 |
| AVTFT-1059 | 9.4um | 150 | 82 x 82 | 20.0 | ±22 | 3.00 | 4-M5 | 135.84 | 26.40 | 32.500 | 145-148 |
| AVTFT-1060 | 9.4um | 40 | 9 x 9 | 14.0 | ±9 | 3.00 | M80×1 | 36.18 | 17.00 | 29.790 | 48.0-50.0 |
| AVTFT-1061 | 9.4um | 150 | 82 x 82 | 20.0 | ±22 | 3.00 | 4-M5 | 146.04 | 26.40 | 29.000 | 145-148 |
| AVTFT-1062 | 9.4um | 75 | 50 x 50 | 14.0 | ±27.8 | 2.80 | M85×1 | 68.95 | 28.00 | 24.100 | 92.0-96.0 |
| AVTFT-1063 | 9.4um | 115 | 71 x 71 | 20.0 | ±25 | 3.00 | —— | 114.5 | 29.30 | 27.500 | 99-101 |
| AVTFT-1064 | 9.4um | 120 | 70 x 70 | 20.0 | ±24 | 3.00 | M85×1 | 111 | 25.60 | 33.910 | 106-120 |
| AVTFT-1065 | 9.4um | 100 | 65 x 65 | 20.0 | ±27.1 | 3.00 | M85×1 | 100.9 | 28.00 | 44.070 | 86.0-90.0 |
| AVTFT-1066 | 9.4um | 75 | 50 x 50 | 20.0 | ±28 | 2.80 | M85×1 | 70.23 | 28.00 | 26.000 | 64.0-85.0 |
| AVTFT-1067 | 9.4um | 100 | 50 x 50 | 20.0 | ±20.5 | 3.00 | M85×1 | 106.03 | 26.40 | 22.460 | 87.0-88.0 |
| AVTFT-1068 | 9.4um | 140 | 70 x 70 | 15.0 | ±20.5 | 1.60 | M85×1 | 88.33 | 20.00 | 25.000 | 165-169 |
| AVTFT-1069 | 9.4um | 100 | 50 x 50 | 20.0 | ±20.8 | 2.70 | M85×1 | 118.84 | 25.60 | 36.465 | 85.0-87.0 |
| AVTFT-1070 | 9.4um | 160 | 120 x 120 | 17.5 | ±31.4 | 1.60 | M85×1 | 130.35 | 25.60 | 41.500 | 156-165 |
| AVTFT-1071 | 9.4um | 100 | 50 x 50 | 15.0 | ±25 | 3.00 | M85×1 | 106.1 | 20.00 | 25.000 | 129-131 |
| AVTFT-1072 | 9.6um | 140 | 70 x 70 | 15.0 | ±20.5 | 1.60 | M85×1 | 88.33 | 20.00 | 25.000 | 165-169 |
| AVTFT-1073 | 10.6um | 100 | 50 x 50 | 25.0 | ±20.5 | 3.00 | —— | 106.1 | 20.00 | 20.000 | 54.2-60.5 |
| AVTFT-1074 | 9.4um | 100 | 37 x 37 | 25.0 | ±15 | 3.00 | M60×1 | 104.18 | 30.30 | 23.960 | 69.0-70.0 |
| AVTFT-1075 | 10.6um | 100 | 50 x 50 | 15.0 | ±21 | 2.00 | M85×1 | 108.72 | 18.50 | 43.550 | 126-131 |
| AVTFT-1076 | 10.6um | 100 | 50 x 50 | 15.0 | ±20.6 | 3.00 | M85×1 | 127.8 | 18.50 | 43.400 | 128.2-129.6 |
| AVTFT-1077 | 9.4um | 52 | 30 x 30 | 20.0 | ±21.8 | 4.50 | M85×1 | 32.26 | 25.52 | 32.110 | 45.0-52.0 |
Legend:
WL = Wavelength | EFL = Effective Focal Length | PD = Pupil Diameter | TA = Telecentric Angle
Scanning Applications
Scan mirrors or a galvanometer typically move the laser beam linearly across a scanning system, guiding it for drilling, cutting, or engraving. An ordinary lens focusing that beam introduces a curved image surface, causing the beam profile to shift with distance from the optical axis — a source of inconsistent optical power and manufacturing defects.
Traditional flat-field scanning lenses partially address this issue by focusing light on a flat image plane but, they introduce other aberrations and errors due to the non-linear movement of the image as the angle changes.
F-theta lenses eliminate these manufacturing errors, including pincushion or barrel distortion, enabling consistent and reliable laser-powered materials processing.
Key Parameters of an F-Theta Lens and Scanning System
- Operating wavelength: the laser wavelength the lens must be corrected for
- Spot size: focused beam width at the image plane
- Scan field diameter (SFD): diagonal length of the square field the lens can focus across
- Output scan angle (OSA): angle between the image plane normal and the output beam; zero for telecentric lenses, otherwise varies slightly across the field
- Working distance: distance from lens housing to paraxial focus point
- Field curvature: deviation from a flat image plane; F-theta design minimizes but does not eliminate it, and placing the zero-curvature point at midrange scan reduces impact
- Diffraction-limited performance: critical where beam quality must be preserved across the field
Custom F-Theta Lenses at Avantier
Avantier designs and manufactures custom and stock F-theta lenses built to order for clients in industry, research, and medicine. Our optical engineers and designers have years of experience crafting high-performance optical components, and every component and assembly that leaves the factory undergoes rigorous testing to meet the highest standards. Contact us today to place a custom order or set up an initial consultation to talk about your F-theta lens application.
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