UV Optics: F-Theta Scan Lenses, Beam Expanders and Mirrors

UV optics transmit, shape and focus the beam in an ultraviolet laser system, so they set much of the precision and efficiency you get at the workpiece. Wavelength Opto-Electronic designs and manufactures UV F-theta scan lenses, UV beam expanders and UV laser line mirrors in fused silica and optical glass. Whether you’re building a UV marking station, integrating a galvo scanner into a micromachining cell, or adding vision feedback to an automated line, the range covers the beam path from laser output to focal plane. If a catalogue part doesn’t fit your system, the optics can be customized to your specification.

UV F-Theta Scan Lenses

The scan lens family has four designs, each suited to a different integration need.

• F-Theta Lens, Optical Glass (SL). The standard choice for galvanometer scanning systems used in laser marking, engraving and cutting. It delivers a focused spot to multiple points across the scan field. Lens adapters are available for compatibility with leading scan head providers.
• Telecentric F-Theta Lens, Optical Glass (TSL). Off-axis beams are focused perpendicular to the workpiece, the same as the on-axis beam. This flattens field curvature to keep distortion low while holding spot quality across the scan field. It is useful where the beam angle at the edge of the field would otherwise affect feature geometry, such as drilling or cutting in electronics and semiconductor packaging.
• Achromatic F-Theta Lens (SLA). The Ronar-Smith® achromatic design limits spherical and chromatic aberration and brings two wavelengths, the working wavelength and a visible wavelength, onto the same plane. The visible feedback and the laser beam stay temporally and spatially matched. That lets you run machine vision through the processing optics for automation control and feedback without compromising process quality.
• Achromatic Telecentric F-Theta Lens (TSLA). Combines telecentric focusing with color correction between the working and vision wavelengths. If you are integrating a vision system into a laser machining system, this design gives accurate vision positioning along with telecentric performance. It suits online inspection, where operators can verify the workpiece in place instead of moving it to an offline station.

Lenses are offered across a wide range of effective focal lengths and scan field sizes, with several mounting thread options and flange mounting. The full parameters for each part are in the specification table on this page.

UV Beam Expanders and Laser Line Mirrors

A beam expander matches the diameter of the beam at the laser output to the input aperture required by the scan lens or objective. Getting this match right affects the focused spot size and how well the downstream optics are used. The UV range includes three types:

• Fixed beam expanders (BEX) for systems with a set expansion ratio.
• Manual zoom beam expanders when you need to adjust expansion during setup or between jobs.
• Motorized zoom beam expanders for systems where expansion is changed under software control.

UV laser line mirrors complete the beam delivery path, steering the beam between the source, expander and scan head.

Why Buy Through Wavelength Optics USA

Working through the US entity gives you a local point of contact for the full Wavelength Opto-Electronic UV catalogue. You can request quotes during US business hours and get answers without coordinating across time zones yourself.

Selecting a UV scan lens or expander involves trade-offs between focal length, field size, input beam diameter, telecentricity and whether you need vision through the lens. Our team can review your laser source, scan head and process requirements and help you narrow the options. We can also confirm adapter compatibility with your scan head. When a standard part doesn’t fit, we can take your requirements into a custom design request.

Send us your laser wavelength, beam diameter, target field size and mounting details, and we’ll recommend parts or start a custom quote.