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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
F-theta lenses have been engineered to provide the highest performance in laser marking, laser engraving and laser cutting systems where constant scan rate and linear displacement are required. F-theta lenses are designed with a barrel distortion, and resulting a displacement that is linear with θ. CASTECH manufactures diffraction-limited telecentric and non-telecentric types F-theta lenses with low distortion. We adopt quality materials, proprietary polishing and coating techniques, and standard interface thread to ensure high laser damage threshold and compatibility of our products.

 

 

 

Telecentric F-Theta Lenses

Non-telecentric F-Theta Lenses

Advantage

The shape of the central spot is consistent with that of the edge spot. 

Small distortion of the spot.

Lower cost.

Disadvantage

Larger size.

Cost more.

The magnification may varies with relative position.

The difference between the center and the edge is large.

 

 

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)

...

 

 

Product Number*

Material

Max Input Beam

Scan Area

Wd

M1/M2

Thread

FT-355-109-63

UVFS

6mm

63x63mm2

151.5mm

13/35.5

M85×1

FT-355-160-99

UVFS

7mm

99x99mm2

194.43mm

13/23

M85×1

FT-355-174-107

UVFS

7mm

107x107mm2

216.48mm

13/20

M85×1

FT-355-255-158

UVFS

10mm

158x158mm2

319.7mm

13/28

M85×1

 

 

 

ABOUT US

 

CASTECH Inc. is a recognized leading supplier of crystals, optics and laser components in the world. Utilizing proprietary crystal growth, fabrication, and polishing techniques, CASTECH has developed a broad range of magneto-optic, acousto-optics, electro-optic, photoelastic and laser application components. Here at CASTECH, we value comity, integrity, honesty, and innovation. Our mission is to be your dependable partner to help you in growth. 
 

 

Founded in 1988 by FIRSM (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences). A public company (2008, Shenzhen, China, Stock Code: 002222). Sales revenue over US$80 millions. Over 1,000 employees. 40,000 m2 facility. The ratio of domestic and international markets stands at 4:6.

 

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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