Every photon counts in high-power applications. Our optical components offer great value if you are using our UV-LED light engines and need to maximize efficiency.

You can rely on us if you need additional optical components to take full advantage of our UV-LED light sources: Providing solutions for challenging applications when it comes to LED illumination is our daily business.

In addition to our standard homogenizing and condensing optics, which you can combine with our UV-LED light engines, we offer customized lens designs, light pipes, and optomechanical assemblies. If your application requires extra flexibility due to design envelope restrictions or required movability, we can provide a broad range of liquid light guides, which are a reliable tool to transmit high-power radiation from distant light sources.

To ensure perfect quality, we cooperate with the finest suppliers in the optics industry.

Standard Homogenizing and Condensing Optics

Very much like the Advanced Light Engines, our standard UV-LED optics product portfolio also follows a modular design principle. You may opt only to use a flexible light guide or one of our light pipes/homogenizers with our light sources and proceed from there with your proprietary setup.

In many cases it makes sense to take a closer look at our condensing optics, too. As the output aperture from our flexible light guides and light pipes/homogenizers is around 0.6 (α~ ±30-35°), our lens systems can be an efficient addition to reduce divergence.

Our light pipes and homogenizers are available in a selection of round, hexagonal, and square shapes. Primelite Performance Optics exclusively use UV-grade material.

Primelite UV-LED Performance Optics
Primelite UV-LED Performance Optics

Primelite Performance Optics Overview

Light Pipes / Homogenizers
Available types:Round Ø6.5 and Ø8.0 mm / Hex Ø8.0 mm / Square 7.0X7.0 mm; Length 58 mm
Numerical aperture1:0.60 / 70° (2α)
AR-coating:Rabs [350-450nm] ≤ 1%
Condensing Optics
Available types:ASP Ø25 mmASP Ø34 mm
Numerical aperture1:0.24 / 28° (2α)0.14 / 16° (2α)
AR-coating:Rabs [350-450nm] ≤ 1%
1Aperture of exiting radiation in combination with Primelite Advanced Light Engines

Customized UV-LED Optics

Often customers need tailored solutions to tackle the challenges of highly specialized applications. Over the past years, we have amassed a legacy of engineering excellence with our UV-LED light sources and designs of optomechanical systems and have successfully supported our customers across a broad range of industries: From automotive, electronics and optoelectronics, pharma packaging, printing to semiconductor manufacturing.

Our expertise may be particularly helpful to realize your individual LED integration project. Talk to us about your unique demands!

Primelite Customized UV-LED Optics
Primelite Customized UV-LED Optics

Liquid Light Guides

We offer single- and multi-pole liquid light guides, which are a perfect fit for our LED light sources. Our liquid light guides are German made, meeting the highest standards in terms of quality, durability, and efficiency. Most applications require optimized transmission for high-power radiation in the NUV (350-450 nm) spectral ranges. However, liquid light guides for UVC or VIS are also part of our product portfolio.

Single-pole Liquid Light Guides

Primelite Liquid Light Guide (Single Pole)
Primelite Liquid Light Guide (Single Pole)

There are three different diameter sizes available of our single-pole liquid light guide: Ø5.0, 6.5, and 8.0 mm. Which size fits your application best depends very much on the required radiation output and optical setup following the light guide. Our liquid light guide comes in a standard length of 1,500 mm. If you need other sizes, we can offer anything between 500 and 20,000 mm.

Multi-pole Liquid Light Guides

Primelite Liquid Light Guide (Multi Pole)
Primelite Liquid Light Guide (Multi Pole)

2- and 4-pole liquid light guides complete our line of products for the transmission of radiation over extended distances. These are the right choice if your curing application needs exposure from various directions. Or, if you want to cure multiple areas simultaneously while using a single light source only (e.g., pen-needle bonding).

Liquid Light Guides vs. Fused Silica Fiber Light Guide Bundles

Why we prefer liquid light guides!

Our light engines are extremely potent UV-LED spot light sources, designed to provide maximum output needed in high-power precision applications. All optical components, which we combine with our UV-LED light sources, have to meet our elevated standards to make an efficient overall setup. In countless industrial applications, as well as in our internal tests, liquid light guides have proven to be a very reliable tool far superior to competing fiber light guide solutions.

While liquid light guides have a numerical aperture of 0.6, the numerical aperture of silica fiber light guides ranges between 0.2 (standard) and 0.3 when optimized for incoherent radiation.

Fiber Light Guide vs. Liquid Light Guide (NA comparison)
NA comparison: Fiber Light Guide (Left) vs. Liquid Light Guide (Right)

Furthermore, silica fiber light guides inherently have the drawback of voids between the fibers of a bundle. These dead areas cannot transmit light and make up for 30% of the light guide’s entry window.

Fiber Light Guide vs. Liquid Light Guide (Light Entry Cross Section)
Light Entry Cross Section: Fiber Light Guide (Left) vs. Liquid Light Guide (Right)

Compared to fiber light guide bundles, the larger aperture and an entirely functional light entry window allow us to couple much more radiation from our LED-Modules into liquid light guides.

The ability to couple more light into a light guide leads to two main advantages:

  • We get higher radiation power output from a liquid light guide. Comparison tests between our Ø 6.5 mm X 1,500 mm liquid light guide and a Ø 7.0 mm X 500 mm model (fused light entry) from a leading silica light guide supplier have shown 2.5 times higher throughput using a liquid light guide.
  • Due to efficient optical coupling, temperatures at the light entry are much lower. A 300-second exposure in the NUV spectral range at rather low power settings (30%) on our light engines is enough to heat the fiber bundle’s light entry to 100°C (a rise of 70°C vs. equilibrium). Our liquid light guide stays relatively cool under these conditions, showing a temperature increase of less than 15°C. Lower temperatures of the liquid light guide allow for long service life. Additionally, the transmission of silica light guide bundles shifts by 5% whenever temperatures change at the entry window, which hurts the output stability of the overall setup in an intolerable way.

Apart from beneficial optical characteristics, liquid light guides consist of a polymer tube with a liquid core, which provides better flexibility and robustness. Where fiber bundles fatigue if they are frequently bent and eventually break, our liquid light guides are super resistant.

Conclusion: Primelite’s UV-LED light sources are designed to deliver 30-50 W of optical output. Using fiber light guides is no option, as there are no high aperture products available. Furthermore, elevated temperatures at the light entry produce unacceptable transmission variations and cause damage to the light source in the long term. Therefore, we are a firm proponent of liquid light guides in combination with our equipment.