F-Theta Lenses
CASTECH's F-Theta lenses have a conventional working wavelength of 355nm. It has many advantages, such as high transmittance, high damage threshold and low F-theta distortion. It is widely used in laser processing. The product also has standard thread interface and protective window. In addition, it also can be customized to the working wavelength and appearance according to customer demand.
F-Theta lenses are commonly used in laser marking,engraving, and cutting systems. F-Theta lens are designed to providea flat field at the image plane in the scanning system. CASTECH's F-Theta lenses have a conventional working wavelength of 355nm, inluding telecentric lenses and non-telecentric lenses. It has many advantages, such as high transmittance, high damage threshold and low F-theta distortion. It is widely used in laser processing. The product also has standard thread interface and protective window. In addition, it also can be customized to the working wavelength and appearance according to customer demand.
Features: Applications:
◆ High efficiency AR coatings ◆ Laser marking
◆ High damage threshold ◆ Laser engraving
◆ Low F-Theta distortion ◆ Laser cutting
◆ Customized design available
Specifications:
| Material | Fused Silica |
| Wavelength | 355nm |
| ?EFL (mm) | 109.4 (telecentric)，160，174.1，255 |
| ??BFL (mm) | 153.5，196.99，219.48，321.7 |
| Working distance (mm) | 151.5，194.43，216.48，319.7 |
| ??Scan angle ( °) | ±24.3，±25，±25.3，±25.5 |
| Scan length (mm) | 91.8，140，151，224.8 |
| ??Scan field (mm) | 63×63，99×99，107×107，158×158 |
| Entrance beam EP (mm) | 6，7，7，10 |
| m1/m2 | 13 / 35.5，13 / 23，13 / 20，13 / 28 |
| M2 to mount edge (um) | 26，15.87，13.72，21 |
| Image spot size(1/e2) (um) | 12，15，16，17 |
| Out diameter (mm) | 121，90，90，107 |
| Total length (mm) | 88.5，55.7，51.98，60.5 |
| Screw thread | M85×1 |
| Transmission | >97% |
| Protective window | Yes |
????Product specifications are subject to change without notice;
??Customized (Wavelength, Dimension, Power Handling , etc) are available;??
??Note:All products are RoHS compliant.????
Product number | Wavelength (A) | Focal distance (B) | Scan field (C) |
FT-A-B-C | 355nm ... | 109(109.4mm) 160(160mm) 174(174.1mm) 225(255mm) ... | 63(63×63mm) 99(99×99mm) 107(107×107mm) 158(158×158mm) ... |
FT-355-109-63:
FT-355-160-99:
FT-355-174-107:
FT-355-255-158:
Example: of the product model number FT-355-255-158 described the working wavelength is 355nm, the effective focal length is 255mm and the scan field is 158mm * 158mm.
F-Theta lenses are commonly used in laser marking,engraving, and cutting systems. F-Theta lens are designed to providea flat field at the image plane in the scanning system. The scan radial imageheight equals to focal length of the lens multiplied by the angle of the chiefray makes in the object space. The formula as follow:
2y’=EFL×2θ×π/180
where2y’ is the scan length or diagonal, EFL is the focal length of the scan lens, 2θ is overall scan angle.
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