The F-theta lens 79 mm from Jenoptik AG - compact 355 nm optics for tight industrial layouts

Reviewed: ad hoc news Bestseller & Flagship desk. Edited and checked on 2026-06-22, 23:03. Details in the imprint.

F-theta lens 79 mm from Jenoptik AG sits in a laser head the size of a shoebox, yet it decides whether a fine UV beam hits copper tracks or misses by micrometers. When the housing hums and the violet 355 nm light fires, this compact optic is doing the quiet precision work.

What this 79 mm lens does

At its core, the F-theta lens 79 mm is a flat-field scan lens tailored to 355 nm UV lasers, used in electronics production, micromachining and similar industrial processes. The 79 mm focal length enables short working distances and a relatively small, tightly controlled scan field. That combination suits compact galvo-scanner heads.

Jenoptik says the design focuses on low distortion across the field so that the laser spot stays in focus and in position from the center to the edge of the processing area. In practice, operators see crisp, sharply defined ablation lines instead of soft edges when drawing fine geometries on PCBs or thin films.

Where Dr. Traub sees the use cases

CEO Dr. Stefan Traub frames these industrial optics as part of Jenoptik's strategy to serve growth fields such as semiconductor equipment and laser processing. The 355 nm portfolio, including the F-theta lens 79 mm, targets OEMs who integrate complete scanner modules into cutting and structuring tools.

For an engineer at an electronics plant, that means the lens works inside a closed machine that routes UV beams across wafers, flexible PCBs or ceramic substrates. The user never touches the glass, but they notice when alignment is right: the laser scribes sharp, clean pads without darkened rims.

Optical details and handling

According to Jenoptik's technical information, this F-theta lens uses a multi-element design optimized for 355 nm with anti-reflection coatings in the UV range to minimize losses. That helps keep pulse energy on the workpiece, which is critical when the process window for ablation is narrow.

In the hand, the lens barrel offers a solid, machined-metal feel with clean edges around the mounting flange. Integrators typically bolt it into a scanner body, then run beam-alignment routines until the small UV spot snaps into focus on a test plate with a bright, sharp reflection.

How it fits in Jenoptik's line-up

Jenoptik groups the F-theta lens 79 mm within its 355 nm F-theta family that spans different focal lengths and image-field sizes. That makes it easier for an OEM to scale a platform: a compact machine can use the 79 mm lens, while a larger system can step up to a longer focal length variant with bigger field.

The company also offers integrated laser processing modules and beam expanders around these optics, creating a kit of parts that laser machine builders can combine. For investors, that ecosystem approach is one of the building blocks behind the group's Photonics-focused strategy described in its annual report.

Stock angle and investor view

Jenoptik positions itself as a photonics specialist with a focus on semiconductor and electronics manufacturing, medical technology and traffic safety. Jenoptik shares (ISIN DE0006229107) trade on Xetra in euros, giving European investors direct exposure to the demand cycles for laser optics such as the F-theta lens 79 mm.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.