Coherent introduces new QBH format, air-cooled fibre optic cables

Created July 14, 2017
Technologies and Products

Coherent – formerly Optoskand AB – has introduced RQB Fibre Optic Cables – described as new air-cooled, beam delivery, fibre optic cables with a standard QBH interface. These are designed for use with fibre lasers operating at CW power levels up to 1.5 kW, and pulsed lasers as high as 1 MW.

The developer says that this specification makes these new cables an attractive option for cost-sensitive applications level, and also enhances system simplicity when utilised with air-cooled fibre lasers.

RQB cables incorporate quartz block technology, which enables the use of anti-reflection coatings to reduce overall losses to under 3%. Additionally, the cables feature a mode stripper to prevent unwanted back reflections or pump light from propagating in the cladding, as well as an integrated thermoswitch in the connector to protect against overheating.

Wide diameter range
They also include a safety interlock that continuously monitors the status of the fibre. RQB Fibre Optic Cables are available with core diameters from 50 µm to 1000 µm, a 0.20 numerical aperture, in lengths of 5m to 200m.

The use of external water cooling extends the RQB maximum power rating to 3 kW. Plus, the option of a square cross-section core delivers an essentially “flat-top” square beam with dimensions ranging from 100µm x 100μm to 1000µm x 1000μm.

Founded in 1966, Coherent is one of the world’s leading providers of lasers and laser-based technology for scientific, commercial and industrial customers. Its stock is listed on the Nasdaq Global Select Market and is part of the Russell 2000 and Standard & Poor’s MidCap 400 Index.

For more information about Coherent, visit


This article was written
by Matthew Peach

Matthew Peach is a freelance technology journalist specialising in photonics and communications. He has previously worked for several business-to-business publishers, editing a range of high-tech magazines and websites.