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    • F-Theta Lenses

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    Product description:

    F-theta lenses are commonly used in applications of laser marking, laser engraving and laser cutting which request constant scan rate and linear displacement. It induces a barrel distortion to produce a flat field in the image plane over the entire working field, so that make the spot position proportional to the scanning angle.

    CASTECH provides diffraction-limited and low distortion telecentric and non-telecentric types F-theta lenses with optimized design. Attributed to selected low absorption materials and our unique polishing & coating technology, our ?-theta lenses can resist high power with high spot consistency. All the lenses have standard threaded interface which is compatible and easy to assemble.

     

    Applications:

    ● Laser industrial processing

    ● Laser sensing system

    ● Ultrafast laser system

     

    Iintroduction:

    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

     

    FT- a - b - c 
    Wavelength (a) Focal Distance (b) Scan Field (c)
    355nm
    109(109.4mm) 63(63×63mm)
    160(160mm) 99(99×99mm)
    174(174.1mm) 107(107×107mm)
    225(255mm) 158(158×158mm)
    ... ...

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