Osram laser chip simplifies fibre optic power

Osram Opto is claiming cleaner laser injection into optical fibres with its most recent laser bar.

The device is 5mm wide and consists of five emitters, each 100μm wide with a 4mm long cavity.

Called SPL BF98-40-5, it creates 976nm infra-red at 3W/mm.mrad at an optical output of 44W.

Lateral divergence is between 6° at 30W (95% of power) and approximately 9.5° at 60W.

“Beam quality of a laser is a crucial factor for coupling laser light into optical fibres,” said Osram. “A brilliant light source greatly simplifies the design of the optical system.”

Electro-optical efficiency is claimed to be 65% at 44W for easier cooling.

According to the firm. Life tests show an output drop under 1% after 4,000 hours producing 65W with 25°C cooling water.

Fibre-coupled diode laser systems are used in the automobile industry for vehicle chassis welding, soldering and coating.

Laser diodes are also used for pumping metal cutting fibre lasers – 976nm is suited to pumping ytterbium-doped fibres in particular.

Development was assisted by the Germany Ministry for Education and Research (BMBF) HEMILAS project.

steve bush

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via Yuichun