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  • Raab, Volker (10)
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Geregeltes Schalten bistabiler Systeme (1996)
Raab, Volker
Efficient phase conjugating mirror with a low threshold in a tapered optical fiber (2000)
Menzel, Ralf ; Raab, Volker ; Lorenz, Dieter ; Heuer, Axel
Transverse effects in phase conjugate laser mirrors based on stimulated brillouin scattering (1999)
Heuer, Axel ; Schultheiss, J. ; Hodgson, N. ; Kurths, Jürgen ; Menzel, Ralf ; Raab, Volker
Novel External Resonators for High Power Diode Lasers with Improved Beam Quality (2000)
Raab, Volker ; Ullner, Ekkehard ; Menzel, Ralf
Induced hysteresis-free transitions in a bistable system (experimental verification) (1997)
Raab, Volker ; Postnov, D.
High-resolution spectrometer using combined dispersive and interferometric wavelength separation for raman and laser-induced Breakdown Spectroscopy (LIBS) (2014)
Riebe, Daniel ; Beitz, Toralf ; Dosche, Carsten ; Löhmannsröben, Hans-Gerd ; Raab, Volker ; Raab, Corinna ; Unverzagt, Matthias
In this paper the concept of a compact high-resolution spectrometer based on the combination of dispersive and interferometric elements is presented. Dispersive elements are used to spectrally resolve the light in one direction with coarse resolution (Delta lambda < 0.5 nm), while perpendicular to that direction an etalon provides high spectral resolution (Delta lambda < 50 pm). This concept for two-dimensional spectroscopy has been implemented for the wavelength range lambda = 350-650 nm. Appropriate algorithms for reconstructing spectra from the two-dimensional raw data and for wavelength calibration were established in an analysis software. Potential applications for this new spectrometer are Raman and laser-induced breakdown spectroscopy (LIBS). Resolutions down to 28 pm (routinely 54 pm) could be realized for these applications.
External resonator design for high-power laser diodes that yields 400 mW of TEM00 power (2002)
Raab, Volker ; Menzel, Ralf
Phase-locked array of 25 broad-area lasers (2002)
Raab, Volker ; Menzel, Ralf
High cw power using an external cavity for spectral beam combining of diode laser-bar emission (2006)
Jechow, Andreas ; Raab, Volker ; Menzel, Ralf
In extension to known concepts of wavelength-multiplexing diode laser arrays, a new external cavity is presented. The setup simultaneously improves the beam quality of each single emitter of a standard 25 emitter broad-area stripe laser bar and spectrally superimposes the 25 beams into one. By using this external resonator in an "off-axis" arrangement, beam qualities of M-slow(2) < 14 and M-fast(2) < 3 with optical powers in excess of 10 W in cw operation are obtained.
Tuning high-power diodes with as much as 0.38 W of power and M2 = 1.2 over a range of 32 nm with 3-GHz bandwidth (2003)
Raab, Volker ; Skoczowsky, Danilo ; Menzel, Ralf
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