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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 ƒ-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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