SCANNER OPTICS
Optimized & Industry-ready Solutions
Scanner Lenses to your specifications
All scanner optics can be coated to your specifications, or are available from stock with our Supermax or UltraLO coatings for superior performance.
Dimensional Tolerances
Dimensional tolerances for standard lenses, windows and mirrors are as follows:
- Diameter: +0/-0.1 mm for most diameters, +0/-0.05 mm for 1.5″ lenses
- Centre thickness: +/-0.1 mm
- Edge thickness variation: most lenses within 0.03 mm and some within 0.05 mm
- Focal length: +/-0.5%. Some long focal singlet scanning lenses can be 1 to 2% due to highly meniscus shape
- Surface form: typically less than 1 visible fringe on a 38 mm diameter test area
- Surface roughness: within 20 Å rms
Tighter tolerances are possible on custom optics. Sometimes they are interrelated if very tight, e.g. the achievable flatness on a window can depend on the thickness (rigidity).
f-theta Scanner Lenses
ULO Optics’ ZnSe singlet scanning lenses, the TSL series, are optimised to minimise the off-axis aberrations.
- Best compromise for all aberrations, field flatness and F-theta error using a single-element, spherical surface lens
- For beams up to 15mm full diameter
- Focal length from 75mm to over 2122 mm
- Covering field sizes from 50mm to 1500mm square
- Use extends over many engraving, marking and cutting applications
- Designed to be positioned at the same location relative to the scanning mirrors, so are directly replaceable with another focal length
- Also available mounted
- Available with a number of different coatings for different wavelengths
Standard singlet f-Theta scanning lenses for a 15 mm diameter beam:
| Part Number | Field Size | Focal Length | Spot diameter (s.d.)* |
| 48TSL75 | 50 mm | 75 mm | 171 (49) micron |
| 48TSL100 | 70 mm | 100 mm | 181 (41) micron |
| 48TSL150 | 105 mm | 150 mm | 219 (32) micron |
| 48TSL200 | 140 mm | 200 mm | 269 (28) micron |
| 48TSL250 | 175 mm | 250 mm | 320 (23) micron |
| 48TSL300 | 210 mm | 300 mm | 373 (20) micron |
| 48TSL360 | 250 mm | 360 mm | 445 (16) micron |
| Part Number | Field Size | Focal Length | Spot diameter (s.d.)* |
| 48TSL360 | 250 mm | 360 mm | 445 (16) micron |
| 48TSL400 | 280 mm | 400 mm | 481 (15) micron |
| 48TSL435 | 300 mm | 435 mm | 525 (15) micron |
| 48TSL720 | 500 mm | 720 mm | 850 (9) micron |
| 48TSL1150 | 840 mm | 1150 mm | 1390 (6) micron |
| 48TSL1285 | 900 mm | 1285 mm | 1520 (7) micron |
| 48TSL2122 | 1500 mm | 2122 mm | 2480 (3) micron |
s.d.* = Standard deviation
N.B.: Spot diameter is determined from optical computation and are not measured values from marking or engraving. The width of an engraved line is affected by laser power, material, scan speed, etc and is normally less than the values listed here. Should smaller spot sizes be required for the same focusing lens, we recommend the use of multi-element lenses, or of our larger diamter singlets (Please call for more info on the larger diameter singlets). Please note that this page is only a representation of our most commonly used replacement f-Theta singlet lenses and is not our entire product line. If there is an item not listed or you have questions, please feel free to contact us and we will be more than happy to assist you.
Telecentric f-theta Scanner Lenses
Telecentric scanning lenses are a special configuration in which the arrangement of optics are designed to focus the beam such that it is always perpendicular to the flat field. This is especially important for drilling applications such as via hole drilling in printed circuit boards, ensuring that the drilled holes are perpendicular to the surface even off the center of the scanning field. Welding and structuring applications can also benefit from the use of a telecentric lens, as the spot remains round, even along the edges of the field.
Telecentric scanning lenses are always multi-element designs and are supplied in a housing. At least one lens element will be larger than the field size to be scanned. In practice, this means that for reasons of manufacture and cost that only small field sizes are possible, in turn implying short focal lengths. Each specific application demands custom solutions for these lens types. Contact us with your specifications for a preliminary design and we will quote you.
- Made to custom requirements.
- Advanced in-house design, based on years of innovation in the field
- Perpendicular beam for critical applications
Multi-element f-theta Scanning Lenses
ULO Optics’ multi-element f-Theta lenses are designed for superior performance for working distances between 75 and 300 mm and field sizes up to 210 x 210 mm, for high power laser applications like marking, welding and structuring. The ZnSe lenses are highly transmissive and are mounted in an aluminum housing for easy handling. A protective window can be included and is recommended for short working distances. Our lenses are available with different coatings as needed.
Doublets, the ZSD-15-Series
The ZSD-15 series doublets contain ZnSe elements made from the same laser grade ZnSe and fully coated with low absorption anti-reflection coatings. They are capable of handling high powers while focusing down to smaller spots.
The ZnSe-Triplets, ZST-15-75 and ZST-15-100
- Focal lengths 75 and 100mm respectively, where higher performance than the doublets is required
- The 75mm focal length lens is also nearly telecentric (see below) with the focused beam less than 5° to the normal
- Diffraction limited performance over the entire image plane
- Can be fitted with a protective window
Specifications
| Part Number | Field Size | Focal Length | Spot Diameter (s.d.)* |
| ZSD-15-75 | 50 mm | 75 mm | 118 (25) micron |
| ZSD-15-100 | 70 mm | 100 mm | 139 (22) micron |
| ZSD-15-150 | 105 mm | 150 mm | 171 (0) |
| ZSD-15-200 | 140 mm | 200 mm | 225 (0) micron |
| ZSD-15-250 | 175 mm | 250 mm | 282 (0) micron |
| ZSD-15-300 | 210 mm | 300 mm | 338 (0) micron |
| ZST-15-75 | 50 mm | 75 mm | 89 (4) micron |
| ZST-15-100 | 70 mm | 100 mm | 113 (1) micron |
s.d.* = Standard deviation
Spot diameter is determined from optical computation and are not measured values from marking or engraving. The width of an engraved line is affected by laser power, material, scan speed, etc and is normally less than the values listed here.
Please note that this page is only a representation of our most commonly used replacement f-Theta multi-element lenses and is not our entire product line. If there is an item not listed or you have questions, please feel free to contact us and we will be more than happy to assist you.
Scanner Mirrors
ULO Optics offers the LSM series of monocrystalline silicon mirrors for use in galvo based scan heads. The mirrors are designed for the use with high power lasers, and are sized to accomodate up to 30 degrees of deflection. The thickness is optimized to provide low mass while minimizing distortion at high scanning speeds. Please contact us with your specifications so we can supply you with a quotation for your specific requirements.
- Low weight for faster scanning speed
- Extremely durable, passes MIL-C-48497A severe abrasion test
- Phase retardation minimised
- Custom mirrors available to your specifications