Bjarne Tromborg (born 1940) is a

Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish a ...

physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate cau ...

, best known for his work in

particle physics Particle physics or high energy physics is the study of fundamental particles and forces that constitute matter and radiation. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) an ...

and

photonics Photonics is a branch of optics that involves the application of generation, detection, and manipulation of light in form of photons through emission, transmission, modulation, signal processing, switching, amplification, and sensing. Though ...

.Henrik Skov, "Kernefysikeren der blev opslugt af optik", ''Ingeniøren'', Nov 27, 2005, http://ing.dk/artikel/67283-kernefysikeren-der-blev-opslugt-af-optik

Biography

Tromborg was born in Give,

Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of Denmark , establish ...

. In 1968, he received the M.Sc. degree in

physics Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which r ...

and mathematics from the

Niels Bohr Institute The Niels Bohr Institute (Danish: ''Niels Bohr Institutet'') is a research institute of the University of Copenhagen. The research of the institute spans astronomy, geophysics, nanotechnology, particle physics, quantum mechanics and biophysics ...

, in

Copenhagen, Denmark Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan ar ...

. He was a university researcher studying high-energy

from 1968 to 1978. In 1979, he joined the research laboratory of the Danish Teleadministrations in Copenhagen. He was Head of Optical Communications Department at Tele Danmark Research, Horsholm, Denmark from 1987 to 1995. He was an adjunct professor at the

from 1991 to 2001. In 1997, he took a leave of absence at the Technion - Israel Institute of Technology. Until his retirement at the end June 2006, he was a research professor at Dept. of Communications,

Optics Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultrav ...

and Materials (currently named

DTU Fotonik, Department of Photonics Engineering DTU may refer to: * Technical University of Denmark ( da, Danmarks Tekniske Universitet, links=no, abbreviated as DTU) * German Taekwondo Union (german: Deutsche Taekwondo Union, links=no, abbreviated as DTU) * Wudalianchi Dedu Airport in Northeast ...

Technical University of Denmark The Technical University of Denmark ( da, Danmarks Tekniske Universitet), often simply referred to as DTU, is a polytechnic university and school of engineering. It was founded in 1829 at the initiative of Hans Christian Ørsted as Denmark's fir ...

Research

Tromborg co-authored a research monograph and approximately one hundred journal and conference publications, mostly on physics and

optoelectronics Optoelectronics (or optronics) is the study and application of electronic devices and systems that find, detect and control light, usually considered a sub-field of photonics. In this context, ''light'' often includes invisible forms of radiat ...

. At the Niels Bohr Institute, he carried out research in

elementary particle physics Particle physics or high energy physics is the study of fundamental particles and forces that constitute matter and radiation. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and b ...

, particularly analytic

S-matrix theory ''S''-matrix theory was a proposal for replacing local quantum field theory as the basic principle of elementary particle physics. It avoided the notion of space and time by replacing it with abstract mathematical properties of the ''S''-matrix ...

and electromagnetic corrections to

hadron In particle physics, a hadron (; grc, ἁδρός, hadrós; "stout, thick") is a composite subatomic particle made of two or more quarks held together by the strong interaction. They are analogous to molecules that are held together by the e ...

scattering. He coauthored a research monograph on

dispersion Dispersion may refer to: Economics and finance * Dispersion (finance), a measure for the statistical distribution of portfolio returns * Price dispersion, a variation in prices across sellers of the same item *Wage dispersion, the amount of variat ...

theory. In the early 1980s, he switched to

. Tromborg was one of the first to develop advanced theoretical models for complex

semiconductor laser The laser diode chip removed and placed on the eye of a needle for scale A laser diode (LD, also injection laser diode or ILD, or diode laser) is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with e ...

structures such as external laser cavities and distributed feedback lasers in the beginning of the 1980s. Computer simulations and measurements confirmed the validity of the theoretical models and their predictions. Several co-workers including Henning Olesen, Gunnar Jacobsen, Jens Henrik Osmundsen, Finn Mogensen, Kristian Stubkjær, Jesper Mørk, Xing Pan, Hans Erik Lassen and

Björn Jónsson Björn Jónsson (8 October 1846 – 24 November 1912) was minister for Iceland from 31 March 1909 to 14 March 1911. He was the father of Sveinn Björnsson, the only regent of Iceland and first president of Iceland. Björn became Minister for ...

contributed to this work over a period of almost 15 years until 1995. At TeleDanmark Research in the late 1980s and early 1990s Tromborg and colleagues worked to study the dynamics of active

semiconductor materials A semiconductor is a material which has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way. ...

in order to understand the physical relaxation processes at play, their strength and characteristic time scales. A pump-probe set-up employing

femtosecond laser Mode locking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10−12 s) or femtoseconds (10−15 s). A laser operated in this way is sometimes r ...

s was established and modeling efforts were initialized. Tromborg led the effort to identify this as a topic that would remain important for many years and argued that Denmark should work to lead in the field. He also proposed theoretical methods that could be used to estimate the size of these

ultrafast In optics, an ultrashort pulse, also known as an ultrafast event, is an electromagnetic pulse whose time duration is of the order of a picosecond (10−12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mo ...

dynamical effects and their role in understanding the origin of nonlinear gain suppression in semiconductor lasers. From 1999 to his retirement at the end of June 2006, Tromborg was with the Department of Communications, Optics and Materials ( COM*DTU) at the Technical University of Denmark. In this period, he worked in both research and education, as well as in securing several

European Union The European Union (EU) is a supranational political and economic union of member states that are located primarily in Europe. The union has a total area of and an estimated total population of about 447million. The EU has often been de ...

research projects for COM*DTU. Tromborg took up the field of

photonic crystal A photonic crystal is an optical nanostructure in which the refractive index changes periodically. This affects the propagation of light in the same way that the structure of natural crystals gives rise to X-ray diffraction and that the atomic ...

s and initiated and contributed himself to activities within the theory of photonic crystals. He also applied general techniques within stochastic theory and

signal analysis Signal processing is an electrical engineering subfield that focuses on analyzing, modifying and synthesizing ''signals'', such as sound, images, and scientific measurements. Signal processing techniques are used to optimize transmissions, di ...

to develop improved descriptions of noise spectra in nonlinear semiconductor optical amplifiers.

Awards and recognition

Tromborg received the Electro-prize from the

Danish Society of Engineers IDA, The Danish Society of Engineers, ( da, Ingeniørforeningen) is a Danish trade union and interest group for highly educated professionals with a background in technology, science or IT. It has the abbreviation IDA (''Ingeniørforeningen i Da ...

in 1981. He was Chairman of th
Danish Optical Society
from 1999 to 2002. He has been Associate Editor of the

IEEE Journal of Quantum Electronics The ''IEEE Journal of Quantum Electronics'' is a peer-reviewed scientific journal covering optical, electrical, and electronics engineering, and some applied aspects of lasers, physical optics, and quantum electronics. It is published by the IEEE ...

since 2003. At his retirement, a symposium on

was held in his honor on 22 June 2006 at the Technical University of Denmark.

References

External links

Publications
{{DEFAULTSORT:Tromborg, Bjarne Danish physicists Particle physicists 1940 births Living people People from Vejle Municipality