Dr. Thorsten Schmitt Profile

Dr. Thorsten Schmitt

Scientist R&D at Paul Scherrer Institut

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Publications (5)

Proceedings Article | 26 September 2013 Paper

High-resolution soft x-ray spectrometry using the electron-multiplying charge-coupled device (EM-CCD)

David Hall, James Tutt, Matthew Soman, Andrew Holland, Neil Murray, Bernd Schmitt, Thorsten Schmitt

Proceedings Volume 8859, 88590H (2013) https://doi.org/10.1117/12.2024010

KEYWORDS: X-rays, Spectroscopy, Charge-coupled devices, Sensors, Spatial resolution, Spectral resolution, X-ray detectors, Interference (communication), Photons, X-ray technology

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Proceedings Article | 25 February 2008 Paper

cw, 325nm, 100mW semiconductor laser system as potential substitute for HeCd gas lasers

T. Schmitt, A. Able, R. Häring, B. Sumpf, G. Erbert, G. Tränkle, F. Lison, W. Kaenders

Proceedings Volume 6876, 687610 (2008) https://doi.org/10.1117/12.761864

KEYWORDS: Semiconductor lasers, Optical amplifiers, Mirrors, Laser systems engineering, Diodes, Crystals, Gas lasers, Ultraviolet radiation, Second-harmonic generation, Nonlinear crystals

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In the last decades, diode laser systems conquered the spectral range step-by-step from conventional gas lasers, wherever they can match or outperform in optical specifications. Although highly anticipated in the ultraviolet wavelength range, for instance in high-resolution lithography, biological and medical fluorescence applications or holography, cw single frequency operation of sufficient power has been a challenge for diode or other solid state laser systems. Currently this scope is still dominated by the HeCd gas laser, emitting at 325 nm with powers of up to 100 mW. In this paper we present a diode laser system emitting at 325 nm offering the same output power by efficient second harmonic generation (SHG) of a master oscillator power amplifier (MOPA) at 650 nm. For the master oscillator a ridge waveguide diode is anti-reflection coated and used in an external cavity diode laser (ECDL) with grating feedback in Littrow configuration. This setup features a MHz line width (coherence length of 100m), a coarse tuning range from 649 nm to 657 nm and a mode hope free tuning of 20 GHz. In a second step, we use a tapered amplifier to boost the output from the ECDL to a level of 400 mW, for powering an efficient second harmonic generation process in an enhancement cavity. Faraday isolators on both ends of the amplifier stage prevent back reflection and stabilize the single mode operation of the system. Together with astigmatism compensation this yields to a high spatial quality (M²<1.5) of the amplified beam. The frequency doubling is achieved by using a four mirror bow-tie enhancement resonator fitted with a Beta-Barium Borate (BBO) crystal. The cavity length is actively locked to the laser frequency using the Pound-Drever-Hall method. With this set-up, stable and reliable laser operation is achieved. After a few minutes warm-up time, fixed frequency and tunable UV output power of more than 100 mW could be generated, opening this important wavelength range for future product development.

Proceedings Article | 28 April 2005 Paper

Amplified picosecond diode lasers for diffuse optical imaging and spectroscopy of tissue

R. Erdmann, M. Langkopf, K. Lauritsen, A. Bulter, M. Wahl, H. Wabnitz, A. Liebert, M. Moller, T. Schmitt

Proceedings Volume 5693, (2005) https://doi.org/10.1117/12.590419

KEYWORDS: Semiconductor lasers, Diffuse optical imaging, Optical spectroscopy, Picosecond phenomena, Spectroscopy, Imaging spectroscopy, Optical spectroscopy imaging, Tissue optics, Laser tissue interaction, Optical tomography

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Proceedings Article | 27 April 2005 Paper

10-W peak power from a gain-switched picosecond all-semiconductor laser

Reto Haring, Thorsten Schmitt, Aude-Reine Bellancourt, Frank Lison, Kristian Lauritsen, Rainer Erdmann, Wilhelm Kaenders

Proceedings Volume 5707, (2005) https://doi.org/10.1117/12.591479

KEYWORDS: Semiconductor lasers, Picosecond phenomena, Optical amplifiers, Laser systems engineering, Microscopy, Pulsed laser operation, Solids, Second-harmonic generation, Diodes, Oscillators

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Proceedings Article | 27 April 2005 Paper

Recent advances in non-linear frequency conversion of high-power, single-mode diode lasers

Thorsten Schmitt, Anselm Deninger, Frank Lison, Wilhelm Kaenders

Proceedings Volume 5707, (2005) https://doi.org/10.1117/12.590465

KEYWORDS: Crystals, Mirrors, Nonlinear crystals, Semiconductor lasers, Ultraviolet radiation, Laser crystals, Second-harmonic generation, Optical amplifiers, Frequency conversion, High power lasers

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