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f-theta-THP
Design wavelength
Focal length f
Input aperture (MAX)*1
Scanning angle
Scanning Range
Working distance (WD)
Laser Damage Threshold *2
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An fθ lens for high power lasers. It is optimized for applications such as laser marking and laser microfabrication. The fθ lens is used to scan the laser beam using a Galvano mirror or polygon mirror.

◦The lens is made of synthetic fused silica with excellent laser induced damage threshold anti-reflection coating for high power lasers.
◦The lens is designed to prevent internal focusing due to the reflected light by the lens surface. The internal damage of the lens by using high power laser is prevented by the design.
◦Also available for fundamental Yb laser (1030nm), harmonic lasers (257nm, 343nm, 515nm).

Related product
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Technical Data
Documents/Downloads
Guide

▶Transmittance value is a representative value only and is not guaranteed. If you have any questions, please feel free to contact our Sales Division.
▶We accept orders to suit customized requirements.
▶ We also fabricate laser scanning systems which combine the galvanometer mirror and fθ lens as a unit.

Attention

▶We do not recommend using fθ lens in an imaging system because it is designed for a scanning type optical system.
▶Please position the incident pupil of the fθ lens beam into the scanning system (galvanometer mirror). If the incident pupil is not in position of the beam scanning system, the optimum focusing spot cannot be achieved because of increased aberration.
▶There is a focal point for the return light between the incident end of the fθ lens and the second mirror (M2). If an optics is placed between there, the optics might be damaged by the laser. Please contact our sales in advance for consultation.

Common Specifications
Housing MaterialAluminum
Housing FinishClear anodize
Outline Drawing
■fθ-63.5-257THP

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■fθ-63.5-343THP

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■fθ-63.5-515THP

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■fθ-63.5-1030THP

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■fθ-100-257THP

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■fθ-100-343THP

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■fθ-100-515THP

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■fθ-100-1030THP

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■fθ-150-257THP

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■fθ-150-343THP

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■fθ-150-515THP

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■fθ-150-1030THP

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■fθ-300-257THP

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■fθ-300-343THP

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■fθ-300-515THP

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■fθ-300-1030THP

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Schematic

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By using the f theta lens, it is possible to be moved a laser light spot in constant speed linear motion on the focal plane by scanning the mirrors such as galvanometer scanner mirrors. The f theta lens enables this by the effect of distortion. Mathematically it is expressed as following; focal length = “f”, ideal image height = “x”, the angle of scanned = “θ” therefore, x = fθ. In the normal single lens, the ideal image height “x” is represented by “x = f tanθ”. Characteristics of both are the same in a small angle range. However, the difference is greater angle increases.
Spec
Compare
Part Number
Add to cart Cart
    JP Yen Stock Qty
fθ-63.5-257THPNEW
fθ-63.5-343THPNEW
fθ-63.5-515THPNEW
fθ-63.5-1030THPNEW
fθ-100-257THPNEW
fθ-100-343THPNEW
fθ-100-515THPNEW
fθ-100-1030THPNEW
fθ-150-257THPNEW
fθ-150-343THPNEW
fθ-150-515THPNEW
fθ-150-1030THPNEW
fθ-300-257THPNEW
fθ-300-343THPNEW
fθ-300-515THPNEW
fθ-300-1030THPNEW

257nm

63.52mm

φ8mm

±9.6°

15x15mm

81.51mm

90%

1J/cm2

343nm

63.53mm

φ8mm

±9.6°

15x15mm

80.69mm

90%

2J/cm2

515nm

63.51mm

φ8mm

±9.6°

15x15mm

79.42mm

90%

7J/cm2

1030nm

63.48mm

φ8mm

±9.6°

15x15mm

75.33mm

90%

10J/cm2

257nm

100.0mm

φ8mm

±15°

35x35mm

139.2mm

90%

1J/cm2

343nm

100.9mm

φ8mm

±15°

35x35mm

146.2mm

90%

2J/cm2

515nm

100.5mm

φ8mm

±9.6°

15x15mm

143.0mm

90%

7J/cm2

1030nm

103.6mm

φ8mm

±15°

15x15mm

147.5mm

90%

10J/cm2

257nm

150mm

φ8mm

±15°

55x55mm

211.9mm

90%

1J/cm2

343nm

148.8mm

φ8mm

±15°

55x55mm

209.8mm

90%

2J/cm2

515nm

150.0mm

φ8mm

±15°

55x55mm

219.8mm

90%

7J/cm2

1030nm

156.1mm

φ8mm

±15°

55x55mm

228.1mm

90%

10J/cm2

257nm

300mm

φ10mm

±16.7°

120x120mm

501.0mm

90%

1J/cm2

343nm

300mm

φ10mm

±16.7°

120x120mm

493.8mm

90%

2J/cm2

515nm

300.8mm

φ10mm

±16.5°

120x120mm

515.3mm

90%

7J/cm2

1030nm

308.7mm

φ10mm

±16.0°

120x120mm

514.0mm

90%

10J/cm2

   

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