Ferdinand-Braun-Institut GmbH

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Ferdinand-Braun-Institut gGmbH
Gustav-Kirchhoff-Str 4
Berlin
Germany
12489
Website: www.fbh-berlin.com/

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Announcements

10 January 2024
High-power diode lasers with wide aperture and high efficiency for materials processing
To reduce cost per device and scale performance, single emitters are increasingly being produced with larger lateral stripe widths exceeding 100 µm. Scientists at the Ferdinand-Braun-Institut have recently realized gallium arsenide-based 915 nm broad area lasers with an aperture of 1,200 µm, which offer excellent output power and high efficiency. In quasi-continuous mode (QCW), they deliver 93 watts of output power per emitter with 70 % efficiency. In continuous wave (CW) operation, these lasers achieve top values with a peak power of 62 watts and 62 % efficiency. The stripe width of the device can be varied within a range of 100 µm to 1,500 µm. In this way, the maximum efficiency at lower or higher output powers can be specifically adjusted to suit the respective application. In addition, the far-field divergence has been improved by the newly developed BRIS technology (Buried Regrown Implant Structure) at the FBH, which allows the laser light to be efficiently coupled into glass fibers. The diode lasers manufactured in this way are ideal for use in efficient, direct materials processing.
10 January 2024
From diode lasers to compact fiber-coupled modules
Laser modules with and without fiber output developed by FBH convert light from the infrared spectral range into visible light via frequency doubling. These modules are key components for a wide range of life science applications, including medicine, bio analytics, and fluorescence measurements. Diode lasers, non-linear crystals and further components are integrated into a butterfly housing with a maximum footprint of 76 mm x 44 mm and can thus further miniaturize existing laser systems. They can provide very efficiently several hundred milliwatts of CW output power via polarization-maintaining single-mode fibers. At a wavelength of 532 nm, for example, the modules achieve more than 200 milliwatts output power. This emission can be realized at almost any wavelength in the range between 460 nm and 592 nm. The Ferdinand-Braun-Institut develops and realizes diode lasers for these and other applications in the wavelength range between 620 nm and 1180 nm. For example, the epitaxial structure of DBR tapered lasers at 1180 nm has been optimized – with a special focus on the high strain in the quantum wells. As a result, the 6 mm long diode lasers now deliver an optical output power of more than 9 watts. They are characterized by a narrow spectral width and excellent beam quality – with a demonstrated lifetime of more than 3,000 hours at an optical power of 7 watts without failures. The FBH has also developed novel diode lasers suited for laser cooling of beryllium ions and calcium fluoride, for example. They emit laser light with a narrow spectral linewidth at center wavelengths around 626 nm and 628 nm with almost diffraction-limited beam quality. Almost any wavelength in the range between 618 nm and 633 nm can be realized, including laser wavelengths used in quantum technology applications. The diode lasers are available mounted in TO housings and on C-mounts – and are also offered as modules with fiber output.
10 January 2024
226 nm far-UVC LEDs for gas sensing
UV LEDs with wavelengths below 240 nm are ideal light sources both for surface disinfection and for sensor applications. In this context, nitrogen oxide with its pronounced absorption line at 226 nm is of particular interest. As a toxic gas, it must be monitored in the exhaust systems of power plants and combustion engines. Until now, bulky and costly light sources based on gas discharge lamps and optical filters have been used for this purpose. Light-emitting diodes, however, offer a much more compact alternative. FBH has developed corresponding LEDs based on the findings of previously optimized 233 nm LEDs. Meanwhile, 226 nm UVC LEDs are available, which achieve an emission power of 1.2 milliwatts and an operating voltage of 9.6 volts at 200 milliamperes.
04 January 2024
Ferdinand-Braun-Institut starts the new year with Patrick Scheele as Scientific Managing Director
In January 2024, Prof. Dr.-Ing. Patrick Scheele (48) has been appointed the new Scientific Managing Director of the Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH). This management function is linked to the W3 professorship of "Microwave and Optoelectronics" at Technische Universität Berlin. Together with Administrative Managing Director Dr. Karin-Irene Eiermann, Scheele will from now on form the joint executive management of the FBH gGmbH. Patrick Scheele follows in the footsteps of long-standing Scientific Managing Director Prof. Dr. Günther Tränkle, who has retired at the end of 2023. According to Günther Tränkle, however, the Ferdinand-Braun-Institut is in capable hands: "I am very pleased that we have been able to win Patrick Scheele as my successor, a proven expert in high-frequency electronics and an experienced leadership personality." Scheele is looking forward to this challenge and to working with the research teams at the institute and the many partners from research and industry: "With its research topics in photonics, III-V electronics and quantum technologies combined with its excellent manufacturing capabilities, the Ferdinand-Braun-Institut is very well positioned. I see this broad sepctrum as a great opportunity to combine the developments from these areas of expertise even more closely and transfer them into applications in line with demand." Patrick Scheele previously worked at Hensoldt Sensors GmbH in Ulm and has known the institute for many years. From April 2015 to April 2023, he was a member and from 2017 also Chairman of the Scientific Advisory Board. As Vice President and Head of Radar Engineering at Hensoldt, he most recently led several large research and development teams with up to 950 employees. In addition to high-frequency electronics including circuit and antenna development, he was responsible for digital electronics and mechanical design along with environmental testing and the EMC laboratory. Over the past few years, he has also been responsible for software development and radar systems engineering. In previous professional positions, he worked on mobile communications components and highly reliable space sensors, among other things.