Border Left

DR.-ING. SIEGFRIED WERTH PRIZE FOR MAXIMILIAN HECK

Classical optics have some disadvantages (e.g. high volume requirements), which are to be replaced by fiber-integrated components, among others. Thus, fiber gratings are the basis to realize narrow and broadband filters and sensors. While light propagates almost loss-free and undisturbed within the optical fiber in certain transversal states, the so-called modes, a well-defined structure in the fiber can help to locally adapt the light guidance. A well known example are long-periodic fiber gratings (LPFG). But tailored stimulation of higher fiber modes is only possible if a precise refractive index modification can be implemented along the fiber.

Maximilian Heck successfully met this challenge in his dissertation "Tailored light propagation by femtosecond pulse written long period fiber gratings", in which he used ultrashort pulses to adapt the transverse geometry and the position of the induced refractive index modification with high precision and flexibility. He took advantage of the fact that when using femtosecond laser pulses with sufficiently strong focusing, nonlinear absorption effects are triggered in the focus. This allows the refractive index to be modified at almost any point along the fiber cross section.
Mr. Heck impressively demonstrated that a well-defined grating structure allows the precise control of light propagation in optical fibers with almost no restrictions and at any point. Such a control is crucial for a multitude of applications in the field of telecommunications, for the construction of fiber lasers and especially in measurement technology.
These ultra-short pulse written LPFGs find various applications, especially in the field of non-contact dimensional measurement technology. By excitation of specific modes in the glass fiber, different parameters such as temperature, tensile stress and deformation, which are applied to the glass fiber, can be measured simultaneously with one and the same grating. This enables a completely new generation of optical sensors for multi-parameter detection. Due to the small size of such sensors, in addition to their extraordinary precision, they have the advantage of being applicable in places that are difficult to access and under rough environmental conditions.
These ultra-short pulse written LPFGs find various applications, especially in the field of non-contact dimensional measurement technology. By stimulating specific modes in the glass fiber, different parameters such as temperature, tensile stress and deformation, which are applied to the glass fiber, can be measured simultaneously with one and the same grating. This enables a completely new generation of optical sensors for multi-parameter detection. Due to the small size of such sensors, in addition to their extraordinary precision, they have the advantage of being applicable in places that are difficult to access and also under rough environmental conditions.
Maximilian Heck - also in cooperation with the COPL of the University of Laval (Québec City, Canada) - has achieved a significant expansion and improvement in the status of ultra-short pulse written LPFG. With his investigations, he has built up a fundamental understanding that makes it possible to realize a new generation of tailor-made components in a wide variety of optical fibers.
His scientific findings were also reflected in a large number of publications in renowned international journals (12; 4 of them as first author) as well as conference papers (21) and a patent application.

2020-11-20_Werth Preis Heck
Dr.-Ing. Maximilian Heck at his works in the laboratory of the IAP. Rights: André Boden - IAP.


All of this is now being honored by the Dr.-Ing. Siegfried Werth Prize 2020 in the field of non-contact, dimensional measurement technolog.


News from: 19.11.2020 16:33
back | next