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  • >

    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.


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          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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