Laser light cables

Laser light cables must meet the most demanding requirements in order to achieve more power, higher efficiency and shorter cycle times in laser material processing systems. The key is best beam quality preservation, high transmission and low weight. These requirements have been the basis for II-VI laser light cables and make them first choice for all current 1 micron laser sources including fiber lasers, disc lasers, and diode lasers. 

II-VI Laser light cables guide the light to the processing head with almost no power or beam quality losses, including the ability to withstand unwanted radiation. Furthermore, they are robust for high accelerations and enable maximum process speed and precision for highly dynamic applications.

With their advanced connectors they are designed for diverse industrial applications. The QBH-compatible connector, the LLK-Q, meets the demanding requirements for dynamic use in cutting machines. The connector LLK-Auto is used as an automotive standard-compliant variant for many applications and laser types. The laser light cable portfolio also includes the connectors LLK-HP for high-power applications and LLK-LP for low-power applications. 

Technical Data

Optical Properties

Fiber core diameter 30, 50, 70, 100, 150, 200, 300, 400, 600, 1000, 1500, 2000 μm, *
30, 50, 100, 150, 200, 300, 400, 600 μm (for LLK-Q and LLK-Auto C), *

lambda = 900 - 1090 nm (for AR Laser Light Cables), *
lambda = 900 - 1080 nm (for LLK-HP, LLK-LP), *
lambda = 800 - 1120 nm (for LLK-Auto NR without protective window),
lambda = 900 - 1090 nm (for LLK-Auto NR with protective window)

Max. laser power
(subject to laser beam coupling conditions) 

up to 20kW(for LLK-Auto)
10 kW (for LLK-Q and LLK-Auto C)
6 kW (for LLK-HP)
250 W (for LLK-LP)

Numerical Aperture of Laser Light coupled into Fibre

Numerical aperture 0.05 - 0.22, *

Mechanical Properties

Laser light cable length 5 - 100 m in steps of 5 m, *
Min. cable radius 150 mm for fiber core diameter < 800 μm(250 mm recommended)
300 mm for fiber core diameter > 800 μm
Max. cable torsion 90°/m, max. 180° total for fiber core diameter < 800 μm
45°/m, max. 180° total for fiber core diameter > 800 μm
Connector type LLK-Q (compatible with QBH)
LLK-Auto (compatible with LLK-D)
LLK-HP (compatible with LLK-B)
LLK-LP (compatible with LLK-A)


Fiber continuity monitoring system Breakage, plug-in and temperature
(for LLK-Auto according to German automotive standard)
Scattered light sensor system Option for all AR connector types and LLK-Auto NR

Subject to change without prior notice
* Others on request


Materials Processing, High Power 1μm Laser Processing, Laser Light Cables, HIGHYAG, Exception-Beamdelivery

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