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GCO-310103 F-theta Lenses

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GCO-31 F-theta Lenses

F-theta Lenses are plane field objectives, which are commonly used in combination with XY galvanometer scanner. Contrary to a normal lens which focuses a input collimated beam on a spherical image plane, a F-theta lens focuses on a ﬂat image surface. At the same time, it maintains almost constant spot size over the entire ﬁeld when the input beam scans with input angle θ. The position of the spot on the image plane is directly proportional to the scan angle, i.e. F-theta condition:

Daheng F-theta lens series (GCO-31) fulfils the F-theta condition better than 0.1%.

APPLICATION

For laser material processing, F-theta lenses guarantee the best processing result over the entire scan field. These lenses contribute to production lines, especially for sophisticated applications. The wide range of applications includes:

◆ Drilling and ﬁne cutting of metals and ceramics

◆ Plastic welding

◆ Marking

◆ Cleaning for treatment or restoration

KEY PARAMETERS

◆ The overall scan angle,θmax, refers to the maximum diagonal scan angle.

◆ The entrance beam diameter, φbeam(1/e2), is the beam diameter where the optical intensity is 13.5% of the peak intensity of the laser beam.

◆ Factor of apodisation （FAP）is the ratio of the beam diameter, φbeam, and the entrance pupil,φaper , of the F-theta lens. FAP is used for calculation of the minimal possible focus spot size.

Φ_aper/ Φ_beam	FAP
2	1.27
1.5	1.41
1.25	1.56
1	1.83
0.9	1.99
0.75	2.32
0.5	2.44

◆ Diﬀraction value M2 refers to the ability of focusing laser light, deﬁned by ISO11146 standards. It is the ratio of the divergence angle of a laser beam to the divergence angle of an ideal Gaussian beam. A Gaussian beam would provide the smallest possible focus spot size, which M2 value is 1. This value is also used for calculation of the minimal possible focus spot size.

◆ Spot size Φspot (1/e2) is the minimal possible focused spot size calculated as the wavelength of the laser multiplied with the focal length of F-theta lens, the FAP and the diﬀraction value M2, divided by the beam diameter Φbeam.

GCO-31 F-theta Lenses

Part No.	EFL	Wavelength	Scan Angle θ	Scan Area (mm*mm)	Max. Input Beam Diameter Ø_beam (mm)	EFL (mm)	WD (mm)	Spot Size Ø spot（μm）	Outer Diameter	Length (mm)	Screw
GCO-310101	100	355nm	±25°	61.5*61.5	6	127.1	115.7	11	90	51	M85X1
GCO-310102	160	355nm	±25°	98.7*98.7	6	205	186.3	18	90	51	M85X1
GCO-310103	254	355nm	±25°	156.7*156.7	10	346.4	298.8	17	120	65.9	M85X1
GCO-310201	100	532nm	±25°	61.5*61.5	12	109.7	100.2	8	90	52.0	M85X1
GCO-310202	160	532nm	±25°	98.7*98.7	12	188.3	178.8	13	90	50.2	M85X1
GCO-310203	254	532nm	±25°	156.7*156.7	16	324.2	293.2	16	120	69.5	M85X1
GCO-310301	100	1064nm	±25°	61.5*61.5	12	108.6	99.1	16	90	52.0	M85X1
GCO-310302	160	1064nm	±25°	98.7*98.7	12	188.2	178.7	26	90	50.2	M85X1
GCO-310303	254	1064nm	±25°	156.7*156.7	16	342.2	293.2	31	120	69.5	M85X1