- 20 July 2006 -

Tunability and single-frequency performance combined in new dfTune OEM laser

At this year’s OPTATEC exhibition in Frankfurt, TOPTICA Photonics presented its new OEM laser module dfTune. Based on near-infrared Distributed Feedback (DFB) diode laser technology, the dfTune provides a diffraction-limited beam profile, single-frequency emission (linewidth < 5 MHz), and wide continuous wavelength tuning (up to 4 nm).
Applications are absorption spectroscopy, gas sensing, LIDAR seeding, interferometry, and difference frequency mixing for tunable THz generation.In order to support OEM integration, attention was paid to a highly compact footprint (smallest version 58 x 44 x 30 cu mm).

An RS 232 interface enables direct access to power and wavelength settings as well as read-out of operation hours and temperature. Changing the laser diode temperature allows for mode-hop free frequency tuning up to 1400GHz. Simultaneously, the laser can be rapidly scanned by modulating the driver current via an external connector port. Depending on the experimental requirements, beam shaping (elliptical or circular beam), optical isolation and even fibre delivery can be integrated into the laser head.

The dfTune laser is insensitive to vibrations or ambient temperature drifts and does not display unwanted mode hops. An intensity stability of 0.1%/h is routinely attained. Typical lifetimes in excess of 10,000 hours (MTBF) allow for low operation costs and maintenance-free performance. The laser module is available within the complete spectral range from 760 - 2800 nm, with output power levels up to 150mW at selected wavelengths.

OPTATEC takes place once every two years at the Frankfurt Exhibition Centre. It is established itself as an international industry forum, and presents the entire spectrum of optics, optoelectronics, laser technology and fibre optics, as well as optical transmission and information technologies.

Germany’s most renowned optics prize, namely the Carl Zeiss Research Award, was bestowed on the first day at OPTATEC 2006 to Professor Dr. Martin Wegener and Professor Dr. Kurt Busch from the University at Karlsruhe (TH) in honour of their work.
Kurt Busch’s contributions to the theory of light propagation in structured materials and Martin Wegener’s experiments have resulted in significant further development of possibilities for the manufacture of 3D photonic crystals. With photonic crystals of this sort, optical processors can, for example, be realised in a highly efficient manner.

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