Similar to scan lenses, the quality of tube lenses is also important. F theta lenses catalog 2017 f theta lenses for galvo systems efl 100 mm, 160 mm, 254 mm accurate beam position design wavelength 1064 nm and 532 nm opto5 f theta lenses meet the standard requirements for the laser marking world, combining the popular focal length range and mount selection with uniform beam quality. Fisheye lenses achieve extremely wide angles of view. The ability to quickly perform repeatable, high accuracy measurements is critical to maximize the performance of many machine vision systems. The enabling key component, f theta lenses, is designed as micrometer focusing scanning lens. We offer ftheta lenses with diameter 90 mm and 104 mm and with working distances from 115 mm to 700 mm.
The lsm03vis scan lens is designed and ar coated for imaging over the visible wavelength range 400 to 700 nm. Standard fused silica f theta lenses are suitable for all highpowerlaser applications like welding, cleaning and structuring. If the image height is direct linearly depending on the mirror angle, we have the so called ftheta lenses. This feature, relative to the prior art, gives this lens a unique design for an f theta scan lens. Nowadays, high accuracy and performance of critical to many machine vision system, a method that use telecentric lens allows highest possible accuracy to be obtained. F theta lenses solve many of the problems associated with laser scanning. F theta lenses are the standard lenses for galvoscannerbased laser marking, engraving, and cutting systems. F theta lenses are plane field objectives, which are commonly used in combination with xy galvanometer scanner.
Optical design and performance of f theta lenses for highpower and highprecision applications conference paper pdf available september 2015 with 5,999 reads how we measure reads. Ftheta lenses catalog 2017 ftheta lenses for galvo systems efl 100 mm, 160 mm, 254 mm accurate beam position design wavelength 1064 nm and 532 nm opto5 ftheta lenses meet the standard requirements for the laser marking world, combining the popular focal length range and mount selection with uniform beam quality. Scanning lenses ftheta product information optical. Ftheta lenses solve many of the problems associated with laser scanning. Border effects in a common imaging lens are strongly reduced by means of a telecentric lens rays which could enter the. Key specifications for this lens are listed to the right. These lenses are made with low dispersion fused silica with optical design to avoid back reflection and ghost image. The enabling key component, ftheta lenses, is designed as micrometer focusing.
It means when the focal length of the ftheta lens is constant, the image height and the field angle satisfy a linear relationship. Design of large working area ftheta lens college of optical. 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. In this paper, the design of the f thea lens with large working area is described in detail. Pdf optical design and performance of ftheta lenses for. Ftheta lenses available only as spare part for dilas diode laser system or in combination with the galvo scanner. Ftheta objective lenses telecentrical lens high power nontelecentrical lens wavelengthnm 355 355 532 1064 part number tfth100355 tfth110355 tfth100532 tfth1001064 focal lengthmm 100. Aberrations that effect scan lens design, and their azimuthal angle. This is a special distortion approach to switch from a sin to a tandependence. Instead of producing images with straight lines of perspective rectilinear images, fisheye lenses use a special mapping for example. Nowadays, a large variety of scanning systems utilizing these devices are commercially.
It is used for high speed micro drilling of printed circuit boards, highspeed marking of electronic parts and resin parts, etc. Tutorial of telecentric lens university of arizona. A fisheye lens is an ultra wideangle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. Linos f theta ronar lenses made of fused silica qioptiq has developed a range of new f theta ronar scan lenses made of fused silica for high power laser material processing. Optical design and performance of ftheta lenses for highpower and highprecision applications conference paper pdf available september 2015 with 5,999 reads how we measure reads. Airspaced 3 or 4element designs transmission of 90% f theta condition accuracy of better than 0. The ftheta silverline lens 170355140 in the wavelengthrange of 355 nm. An actual laser drilling machine is designed as a system that. Zebase 6 is a collection of over 600 sequential optical designs in opticstudio format on cd. The adjacent plot shows departure from perfect linear ftheta mapping for each of the full field fisheye lenses. Highly precise telecentric lenses minimize distortion and make a laser beam incident almost perpendicularly to the work piece. Fisheye lens designs and their relative performance. This section discusses the unique performance characteristics of telecentric lenses and how telecentricity can. In this paper, the author outlines the engineering of the f theta lens and its applications.
Development of ftheta lens for printed wiring board processing. Development of ftheta lens for uv lasers sumitomo electric. When used with a wobble correction cylinder mirror, this four element f theta scan lens 100 provides differential bow correction, wobble correction, and small crossscan field curvature. If the image height is direct linearly depending on the mirror angle, we have the so called f theta lenses. In lens design with large computers, proceedings of the conference, institute of optics, government superintendent, rochester, new york. The focus in current ftheta lens design lies in later mentioned challenges, as low image field curvature and constant spot size over the whole processing area. It is well known that many optical systems have distortions. Jan 20, 2006 the paper provides the new type construction of laser confocal microarray scanning and fluorescent detection system. Additionally, the compact design of the f theta lens allows the user to reduce the number of optical components needed to provide a flat image plane. The lens would then see those rays as if they were coming from behind the object. Ftheta lenses laser optical components optical control.
Ftheta scanning lenses designed for laser marking applications with nd. Yag lasers fundamental 1064 nm or second 532 nm, or third 355 nm harmonic. The adjacent plot shows departure from perfect linear f theta mapping for each of the full field fisheye lenses. Optimal lens design and use in laserscanning microscopy. These requirements are met with the use of f theta lens, a compound lens which has an optical design to suppress the aberration to the diffractionlimited level, and a precise aspheric surface. Jenoptiks f theta lenses are optimized for the requirements of laser material processing. Pdf ftheta lenses are widely used in remote laser processing. With the development of dwdm system, compact spectrometer and various grating based devices, the interest in solving optical problems with innovative optical design has been a revival. This lens focuses a laser beam scanned with a scanner, etc. An f lens containing a first lens group having an objectside convex positive lens, a second lens group having an objectside concave negative lens, a third lens group having a positive refractive power, the third lens group being a single positive lens, an assembly of a positive lens and a negative lens or another assembly of a positive lens and another positive lens. Zebase 6 includes a copy of milton laikins book, lens design. We offer the ftheta objective lenses as a standard selection or can adapt them to meet your exact requirements. Linos fthetaronar lens f 254mm, 1064nm part number 440128800020 design wavelength.
Laser scanning microarray reader article pdf available in optical and quantum electronics 37. Fused silica minimizes focus shift while providing high power density. Detailed laser processing with ftheta lenses jenoptik. Thermal lens, which occurs at high power laser applications and leads to afocal shift, is also minimized. Optical engineers differ between telecentric and nontelecentric f theta lenses fig.
While this lens design is optimized for oct imaging, it may also be used in a variety of laser scanning microscopy applications. This is a special distortion approach to switch from a sin to a tandependence of the. Telecentric f theta lenses require very large lens diameters for long scanning paths lens diameter approx. These lenses are able to realize tighter spot sizes, which translate into higher resolution for scanning or printing, as. Scan lenses are used for moving a field point over the image area by rotating a mirror. One of the most popular is certainly the f theta lens used in laser scanning systems to produce a constant scan velocity across the image plane we call it f theta distortion. Here we present several simple lens designs of superior quality that fully make use of highna lowmagnification objectives, offering diffraction. The scanner exploits the functional advantages and the optical system has small spot size, great linearity and large depth of focus. Tutorial of telecentric lens haosheng hu college of optical sciences university of arizona december 6, 2016 introduction. The thesis titled long wave infrared scan len design and distortion correction. Pdf laser scanning technology has put in microarray image system for its.
A telecentric f theta lens differs from a normal f theta lens in that the axis of the focused laser beam bundle is perpendicular to the scanning plane throughout. For such systems, a telecentric lens allows the highest possible accuracy to be obtained. On the one hand, they are designed to yield excellent optical performance, manifesting itself in small field curvature, small distortion, and diffraction limited focus sizes. Ftheta scan lens is used in conjunction with xy galvanometer scanner and beam expander to form a two dimensions scanning system. Pdf optical design and performance of ftheta lenses for high. High performance f theta lenses, realized by combining lens design techniques with antireflective coating technology. The diffractionlimited, multipleelement, airspaced lens design is optimized for a flat field in the image plane and low f theta distortion. Scanning lenses f theta optical components scanning lenses product information cascade laser corp. Laser beams move parallel to the optical axis after passing a telecentric lens. Wide area nontelecentric lenses is suitable for markers, plotters, etc. Lens design, gives insight into the engineering problems of each lens design type and practical solutions that are expensive to discover independently. In laserscanning microscopy often an offtheshelf achromatic doublet is used as a scan lens which can reduce the available diffractionlimited fieldofview fov by a factor of 3 and introduce chromatic aberrations that are scan angle dependent.
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