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F-theta Lens

Han's Scanner F-Theta lens series products are the most commonly used parts in the laser field. After our continuous improving and updating, we have improved quality of telecentric F-theta lens, following the development direction of international industrial laser cutting,  and has developed a series of products. In addition to regular marking F-theta lens, there are water-cooled F-Theta lenses for higher power, as well as for faster pulses of ultra-fast lasers. Common Fθ scan lens can be widely used in various laser application fields such as laser marking, engraving and scribing.

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what is f theta lens
what is f theta lens
telecentric f theta lens
f theta scan lens

Key Features Of F-theta Lens


Wavelength Compatibility: Designed to accommodate various laser wavelengths, such as 1064nm, 532nm, and 355nm, ensuring versatility for different applications.


Focal Length Options: The F-θ lens series provides a range of focal lengths, allowing users to select the appropriate lens based on the specific requirements of their laser systems.


Entrance Pupil Diameter Variation: Offers options with different entrance pupil diameters to suit the diverse needs of laser applications, providing flexibility in system design.


Power Adjustment: Subdivided into products with different power specifications, enabling users to choose the optimal F-theta lens based on the power requirements of their laser systems.


Telecentric Design: Incorporates a telecentric design, ensuring that the chief rays are parallel to the optical axis. This feature of telecentric F-theta lens is valuable for maintaining consistent image quality throughout the field of view.


Precision for Ultrafast Lasers: Developed in response to the latest trends in laser technology, the F-theta scan lens series includes a specialized flysecond optical system, catering to ultrafast laser applications.


What Is F-theta Lens?


An f-theta lens, including telecentric f theta lens, is a type of lens used in laser marking, engraving, and scanning systems. The term 'f-theta' refers to the relationship between the focal length (f) and the angle (theta) of the laser beam as it scans across a flat plane. Unlike regular lenses that create a linear increase in distance with the angle, f-theta lenses produce a linear increase in distance for each unit of angle over a flat field.


The primary function of an f-theta scan lens is to ensure a consistent spot size and marking quality across the entire marking field. This is crucial in applications where precision and uniformity of laser marking or engraving are essential.


F-theta scan lenses are commonly used in laser systems for tasks such as marking barcodes, serial numbers, patterns, or intricate designs on materials like metals, plastics, and ceramics. The flat field of focus provided by these lenses allows for accurate and distortion-free laser marking over a specified area."


How Does a Galvanometer Scanner Work?


A galvanometer scanner operates as a special type of oscillating motor. The basic principle involves an energized coil generating torque within a magnetic field. Unlike traditional rotating electric machines, the rotor in a Galvo motor system is loaded with a reset torque via a mechanical spring or electronic method. When the coil is energized with a specific current, the rotor deflects to a certain angle, balancing the electromagnetic torque with the restoring moment. This deflection is proportional to the current, similar to a galvanometer, hence the name galvanometer scanner.


The operation of a galvanometer scanner involves inputting a position signal, causing the Galvo motor to swing to a specific angle based on the voltage-to-angle conversion ratio. The entire process employs closed-loop feedback control, comprising five control circuits: position sensor, error amplifier, power amplifier, position distinguisher, and current integrator. 


Analog galvanometer scanners are susceptible to electromagnetic interference, leading to scattered points, curved lines, and irregular shading. In contrast, digital galvanometer scanners convert analog signals into digital signals, effectively suppressing environmental interference. 


Whether you need a single axis galvo scanner or a more complex galvanometer mirror scanner, understanding these principles will help you choose the right system for your laser marking machine. Explore Scanner Optics collection to find the perfect Galvo  motor system for your needs.


Specifications Of F-theta Lens


 Infrared F-Theta lens
Specification modelfocal length(mm)Clear aperture(mm)Scanning angleMarking range(mm)Applicable wavelength(mm)Focus spot(μm)Dimensions(mm)distance of  M1distance of  M2Working distance(mm)Connection method
GF101005RY100Φ12±25°55*551030-108016μmΦ90* 70.512.616.5122.5M85*1.0
MF161210IR164Φ12±25°100*1001030-108028μmΦ90* 4212.622.25185.5M85*1.0
GF161010IR164Φ10±25°100*1001030-108030μmΦ90* 5312.615.35203.5M85*1.0
GF161410IR164Φ14±25°100*1001030-108025μmΦ95* 6314.715.4208.2M85*1.0
F251618IR258Φ16±27°180*1801030-108032μmΦ112* 5616.529.8299M85*1.0
F351825IR354Φ18±29°250*2501030-108037μmΦ140* 6416.524.2407M85*1.0
F392425R390Φ24±25°250*2501030-108032μmΦ95* 463525.7420.8M85*1.0


Infrared high power F-Theta lens

Specificationsfocal length(mm)Clear aperture(mm)Scanning angleMarking range(mm)Applicable wavelength(mm)Focus spot(μm)Dimensions(mm)distance of  M1distance of  M2Working distance(mm)Connection methodRemark
XSF173010RY170Φ30±25°105*105650/106410μmΦ147* 11135.629194M112*1.0Achromatic lens
DGF253013IRWAT254Φ30±20°135*1351030-108020μmΦ150* 903628.5316.5Flange connectionWater-cooled lens
DGF333016IRWAT330Φ30±21°175*1751030-108023μmΦ162* 923630417Flange connectionWater-cooled lens
DGF463023IRWAT460Φ30±21°245*2451030-108030μmΦ162* 913729565Flange connectionWater-cooled lens


Green F-Theta lens

Specification modelfocal length(mm)Clear aperture(mm)Scanning angleMarking range(mm)Applicable wavelength(mm)Focus spot(μm)Dimensions(mm)distance of  M1distance of  M2Working distance(mm)Connection method
MF061004GY64Φ10±25°40*405327μmΦ90* 6212.616.7574.1M85*1.0
GF071004GY74Φ10±21.5°40*405328μmΦ90* 7012.615.591.2M85*1.0
MF101005GY100Φ10±25°50*5053210μmΦ115*7312.615.2110M85*1.0
GF121206GY115Φ14±21°65*655328.5μmΦ112* 9314.723.5147.2M85*1.0
MF161610GOO164Φ16±25°100*10053210μmΦ96* 5014.722.5188.5M85*1.0
MF252016GOO258Φ20±25°160*16053213μmΦ90*4626.518.5287.5M85*1.0
HF481630GOO480Φ16±25°315*31553230μmΦ95*5314.720.5482M85*1.0


UV F-Theta lens

Specification modelfocal length(mm)Clear aperture(mm)Scanning angleMarking range(mm)Applicable wavelength(mm)Focus spot(μm)Dimensions(mm)distance of  M1distance of  M2Working distance(mm)Connection method
GF101205UVOY100Φ12±22°55*553557μmΦ90* 6514.715123M85*1.0
HF161010UVO161Φ10±25°100*10035510μmΦ90* 5312.615.8196M85*1.0
GF251016UV254Φ10±25°165*16535517μmΦ95* 5412.621.35309.5M85*1.0


Telecentric vs. F-Theta Lenses


FeatureTelecentric LensF-Theta Lens
PriorityConsistent image qualityConsistent image size (magnification)
Chief RaysParallel to optical axisCan vary depending on scan angle
ApplicationsMachine vision, precise measurementLaser marking, engraving, cutting (flat surfaces)
Key BenefitAccurate size measurement across field of viewConsistent beam size for even processing


Galvanometer Application

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