Non-linear Optics and Tunable Lasers

Our Service

Fraunhofer ILT develops lasers with adjustable wavelengths – from UV to MIR – for a wide range of applications, from measurement technology to material processing. Such laser systems are built using tunable lasers, parametric beam sources and non-linear frequency converters.

On this basis, the institute has developed solutions for a wide range of specific requirements, such as an average power of several milliwatts up to many hundreds of watts, time regimes from ultrashort pulses to continuous operation or spectral properties of ultra-broadband spectra to single-frequency operation. With the scope of the institute’s current research projects, the range of parameters and fields of application for lasers and optics are continually being expanded. In addition, we offer our customers from industry and research needs-based solutions for implementing new ideas and optimizing existing laser sources, e.g. in terms of their robustness, efficiency or cost-effectiveness.

Mittels Löttechnik realisierter optisch parametrischer Oszillator.
© Fraunhofer ILT, Aachen, Germany.
Mittels Löttechnik realisierter optisch parametrischer Oszillator.
Diode-pumped Alexandrite laser.
© Fraunhofer ILT, Aachen, Germany.
Diode-pumped Alexandrite laser.
Parametric source for entangled photons.
© Fraunhofer ILT, Aachen, Germany.
Parametric source for entangled photons.

In particular, robust beam sources are in great demand for atmospheric research since the operating conditions, such as on ships, zeppelins, aircraft or in Arctic regions, are particularly adverse. For laser material processing with adapted wavelengths, frequency-converted lasers of high average power are typically used. In addition to optimizing established laser designs with wavelengths of around 1 μm and below, the scientists at Fraunhofer ILT are also opening up wavelength ranges in the long-wave infrared. Here, many technically and economically interesting material classes exhibit very high absorption. In the field of quantum technology, we are developing innovative applications for parametric beam sources and frequency converters in close cooperation with top German and international researchers. These range from non-invasive sensor technology to secure data communication and cryptography to components for future quantum computers.

Fraunhofer ILT offers its customers feasibility studies on individual tasks, the development or optimization of lasers and frequency converters, corresponding system integration, the analysis and validation of optical concepts and components as well as comprehensive consulting.

Nonlinear Optical Frequency Converters

  • For solid-state, fiber and diode lasers
  • Efficiency-optimized setups for all operation modes from cw to ultrafast pulses and for pulse powers up to 100 MW
  • Based on various NLO media with quasi- or birefringent phase-matching, with and without waveguide structures
  • Output wavelength from UV to MIR
  • Average power from the milliwatt level to several hundred watts

Tunable Lasers

  • UV to NIR: widely tunable, narrow linewidth lasers and frequency converters with nanosecond pulses
  • MIR: tunable OPG and OPA with picosecond pulses

Business Activities

  • Technology consulting and patent research
  • Performance modeling and design
  • Feasibility studies and characterization of laser sources and components
  • Development of prototypes


Our brochures offer a quick view onto the service portfolio “Non-linear Optics and Tunable Lasers“. Find more detailed information in the “project results“ tab.


Brochure “UV, VIS and Tunable Lasers“


Laser technology can solve demanding tasks in many different industries. Whether as a tool in automotive production, as measuring equipment in the environmental sector, as a diagnostic or therapeutic instrument in medical technology or as a communication medium in space technology, the laser provides multiple uses with high productivity and high efficiency.

Read up about the innovations of the Fraunhofer ILT in a few selected industries and convince yourself!


Carstens, H., Högner, M., Saule, T., Holzberger, S., Lilienfein, N., Guggenmos, A, Jocher, C., Eidam, T., Esser, D., Tosa, V. , Pervak, V., Limpert, J., Tünnermann, A., Kleineberg, U., Krausz, F., Pupeza, I.:
High-harmonic generation at 250  MHz with photon energies exceeding 100  eV.
Optica 3 Nr. 4, 366-369 (2016)

Munk, A., Jungbluth, B., Strotkamp, M., Hoffmann, H.-D., Poprawe, R., Höffner, J.:
Diode-pumped Alexandrite ring laser for LIDAR applications
Proc. SPIE 9726, 97260I (6 S.) (2016)

Wueppen, J., Nyga, S., Jungbluth, B., Hoffmann, D.:
1.95  μm-pumped OP-GaAs optical parametric oscillator with 10.6  μm idler wavelength
Opt. Lett. 41 (18), 4225-4228 (2016)

Jungbluth, B., Elsen, F., Strotkamp, M., Wüppen, J., Hoffmann, D.:
Gepulste Hochleistungslaser mit adressierbarer Wellenlänge im IR
Photonik Nr 6, 34-37 (2015)

Li, P., Lewin, M., Kretinin, A.V. , Caldwell, J. D., Novoselov, K. S. , Taniguchi, T., Watanabe, K., Gaussmann, F., Taubner, T.:
Hyperbolic phonon-polaritons in boron nitride for near-field optical imaging and focusing
Nature Communications 6, 7507 (9 S.) (2015)

Bensmann, S., Gaußmann, F., Lewin, M., Wüppen, J., Nyga, S., Janzen, C., Jungbluth, B., Taubner, T.:
Near-field imaging and spectroscopy of locally strained GaN using an IR broadband laser
Opt. Expr. 22 (19), 22369-22381 (2014)

Elsen, F., Heinzig, M., Livrozet, M. J.: Löhring, J., Wüppen, J., Büdenbender, C., Fix, A., Jungbluth, B., Hoffmann, H.-D.:
Feasibility and performance study for a space-borne 1645 nm OPO for French-German satellite mission MERLIN
Proc. SPIE 9135, 913515 (7 S.) 1-7 (2014)

Gronloh, B., Russbueldt, P., Jungbluth, B., Hoffmann, H.-D.:
Green sub-ps laser exceeding 400 W of average power
Proc. SPIE 8959, 89590T (10 S.) (2014)

Strotkamp, M., Witte, U., Munk, A., Hartung, A., Gausmann, S., Hengesbach, S., Traub, M.:
Broadly tunable, longitudinally diode-pumped Alexandrite laser
Proc. SPIE 8959, 89591G (6 S.) (2014)

Petraviciute-Lötscher, L., Schneider, W., Rußbüldt, P., Gronloh, B., Hoffmann, H.-D., Kling, M. F., Apolonski, A.:
Direct low-harmonic generation in gas at MHz repetition rate
Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC)
Conference on and International Quantum Electronics Conference, Munich 12-16 May 2013 (1 S.) (2013)

Strotkamp, M., Munk, A., Jungbluth, B., Dahlhoff, K., Jansen, P., Broch, S., Gomm, S., Bachner, M., Fuchs, H., Holland, Hofzumahaus, A.:
Design of a rugged 308 nm tunable UV laser for airborne LIF measurements on top of Zeppelin NT
Solid State Lasers XXII, Proc. SPIE 8599, L1-10, (2013)

Gronloh, B., Russbueldt, P., Schneider, W., Jungbluth, B., Hoffmann, H.-D.:
High average power sub-picosecond pulse generation at 515 nm by extracavity frequency doubling of a mode-locked Innoslab MOPA
Proc. SPIE 8235, 10 S., (2012)

Jungbluth, B., Nyga, S., Pawlowski, E., Fink, T. Wüppen, J.:
Efficient frequency conversion of pulsed microchip and fiber laser radiation in PPSLT
Proc. SPIE 7912, 79120K, 8 S., (2011)

Wueppen, J., Jungbluth, B., Taubner, T., Loosen, P.:
Ultrafast tunable mid IR source
36th Ann.l Int. Conf. on Infrared, Millimeter, and Terahertz Waves. Houston, TX, USA, 2 S., (2011)

Wueppen, J., Jungbluth, B., Taubner, T., Loosen,  P.
Ultrafast Tunable Mid IR Source
IEEE IRMMW-THz Conference, Houston, (2011)

Wueppen, J., Pawlowski, E., Traub, M., Jungbluth, B., Hasler, K.-H., Sumpf, B., Erbert, G.
Compact module of a frequency-doubled, cw diode laser with an output power of more than 500mW at 531nm and a beam quality of less than 1.3
Proc. SPIE 7582, 758204, 8 S., (2010)

Gronloh, B., Mans, T., Rußbüldt, P., Jungbluth, B., Wester, R., Hoffmann, D.
High Power SHG at 515 nm by means of extracavity frequency conversion of sub-picosecond pulses from a mode-locked Innoslab MOPA
Advanced Solid-State Photonics, OSA Technical Digest Series. Optical Society of America, San Diego, Ca., January 31-February 3, 2010. Paper AtuA13, 2 S., (2010)

Nyga, S., Geiger, J., Jungbluth, B.
Frequency doubling of fiber laser radiation of large spectral bandwidths
Proc. SPIE 7578, 75780P, 7 S., (2010)

Strotkamp, M., Schwarz, T., Jungbluth, B., Faidel, H., Leers, M.
Efficient, green laser based on a blue-diode pumped rare-earth-doped fluoride crystal in an extremely short resonator
Proceedings of SPIE 7578, 75780O, (2010)

M. Strotkamp, T. Schwarz, B. Jungbluth
Power Scaling of a Compact and Efficient Blue Diode Pumped Solid State Laser Emitting Green Light
Advanced Solid-State Photonics, OSA Technical Digest Series (CD) (Optical Society of America), paper AMB29, (2010)

M. Strotkamp, T. Schwarz, B. Jungbluth
Efficient, green laser based on a blue-diode pumped rare earth doped fluoride crystal in an extreme short resonator
Conference on Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009, Munich,
Mulhouse: European Physical Society 1-1, (2009)

M. Duering, V. Kolev, B. Luther-Davies
Generation of tuneable 589nm radiation as a Na guide star source using an optical parametric amplifier
Opt. Expr. 17, 437-446, (2009)

B. Gronloh, M. Höfer, R. Wester, and H.-D. Hoffmann
High power UV generation at 355 nm by means of extracavity frequency conversion of a high repetition rate Innoslab MOPA system
Proc. SPIE 7193, 71930Y, (2009)

B. Jungbluth, D. Oberbeckmann, J. Wueppen
Power-scaling and prototyping of a gain switched Ti:Sapphire laser with a tuning range of 400 nm
Proc. SPIE 7193, 71930, 8 S., (2009)

B. Jungbluth, M. Vierkoetter, M. Hoefer, J. Loehring, D. Oberbeckmann, D. Hoffmann
Design and characterization of a rugged and compact setup for widely tunable harmonic generation in the ultraviolet
Proc. SPIE 6455, 1-10, (2007)

M. Hoefer, M. Traub, R. Kleindienst, H. Sipma, H.-D. Hoffmann, P. Wessels, P. Burdack
Multi ten-watt, ultra-stable, and tuneable Innoslab-based single frequency MOPA
Proc. SPIE 6451, 7 S., (2007)