Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Ber... more Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany 1Department of Molecular Science & Technology, Ajou University, 5 Wonchun-dong, Paldal-gu, 442-749 Suwon, Korea 2Department of Physics, Royal ...
We report on what is to our knowledge the first optical parametric oscillator (OPO) pumped by mic... more We report on what is to our knowledge the first optical parametric oscillator (OPO) pumped by microsecond pulses from a wavelength-tunable solid-state laser. The singly resonant OPO (SRO) is based on a periodically poled LiNbO3 crystal and pumped with 2.1-micros-long pulses from an actively Q-switched Yb fiber laser. At an average fiber laser power of 3.6 W, the SRO generates 1.9-micros-long pulses with a repetition rate of 25 kHz and an average power of 560 mW at 3360 nm. The SRO was tuned from 1518 to 1634 nm (signal) and from 3145 to 3689 nm (idler) via the crystal temperature and poling period. By all-electronic tuning of the fiber laser wavelength over 19 nm, tuning of the mid-infrared idler wavelength over 195 nm was achieved.
We report self-starting mode-locking of a diode-pumped super-stretched unidirectional ring laser ... more We report self-starting mode-locking of a diode-pumped super-stretched unidirectional ring laser based on a 26 m cladding-pumped Yb3+-fiber and an internal grating dispersion compensation. The long fiber resulted in an extremely high pulse stretching ratio inside the cavity of about 500 which is more than one order of magnitude above previously demonstrated laser systems. This system was passively mode-locked by
A diode-pumped mode-locked double clad Yb3+-fiber ring laser with up to 118 nm bandwidth, a repet... more A diode-pumped mode-locked double clad Yb3+-fiber ring laser with up to 118 nm bandwidth, a repetition rate of 7.6 MHz and a maximum output power of 2.8 W is presented. The broad bandwidth is achieved by suppressing the long wavelength components in the dispersive grating line of the resonator.
Summary form only given. We report on a widely tunable narrow linewidth ytterbium-doped fiber rin... more Summary form only given. We report on a widely tunable narrow linewidth ytterbium-doped fiber ring laser device with a linearly polarized output power of 10 W. The Large Mode Area (LMA) core of the 20 m long fiber had a diameter of 10 /spl mu/m and was doped with 1000 ppm ytterbium. The core was transverse single-mode for wavelengths above 1 /spl mu/m. The pump-cladding was D-shaped in order to improve the pump light absorption. As pump source we used a fiber coupled 980 nm laser diode. The small quantum defect between the pump and the laser wavelength enables a very high efficiency. At maximum pump power of nearly 32 W a linearly polarized output power of 10 W with a slope efficiency of 68% with respect to the absorbed pump power at a wavelength of 1080 nm was achieved.
We present experimental results, which show that the up-chirp of dispersively stretched femtoseco... more We present experimental results, which show that the up-chirp of dispersively stretched femtosecond pulses decreases linearly with increasing pulse energy after amplification in Erbium-doped fibers. For 6 microJ output pulses a nonlinear dispersion of -410(6) fs(2) was measured. This nonlinear dispersive effect is attributable to the resonant dispersion of the Erbium-ions and the decrease of the inversion during pulse amplification and was about one order of magnitude larger than predicted by the literature. Most likely this deviation is attributable to the complex population dynamics of the Er3+-ions during pulse amplification, since in the literature the relation between the refractive index and Er3+-inversion was described for a quasi-static population distribution. Due to the high resonant dispersion the required compressor dispersion for minimum output pulse duration depends strongly on the output pulse energy in Erbium-doped fiber-based chirped-pulse-amplifier set-ups.
Amplification of chirped fs-pulses in an Erbium doped fiber amplifier upto 0.8μJ resulted in an a... more Amplification of chirped fs-pulses in an Erbium doped fiber amplifier upto 0.8μJ resulted in an additional peak in the spectrum at 1584nm. This peak, attributable to four-wave-mixing between the signal centered at 1559nm and amplified spontaneous emission at 1534nm, hinders the temporal recompression of the amplified chirped pulse. Compared to the forward pumping configuration, this four-wave-mixing in the amplifier was
Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Ber... more Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany 1Department of Molecular Science & Technology, Ajou University, 5 Wonchun-dong, Paldal-gu, 442-749 Suwon, Korea 2Department of Physics, Royal ...
We report on what is to our knowledge the first optical parametric oscillator (OPO) pumped by mic... more We report on what is to our knowledge the first optical parametric oscillator (OPO) pumped by microsecond pulses from a wavelength-tunable solid-state laser. The singly resonant OPO (SRO) is based on a periodically poled LiNbO3 crystal and pumped with 2.1-micros-long pulses from an actively Q-switched Yb fiber laser. At an average fiber laser power of 3.6 W, the SRO generates 1.9-micros-long pulses with a repetition rate of 25 kHz and an average power of 560 mW at 3360 nm. The SRO was tuned from 1518 to 1634 nm (signal) and from 3145 to 3689 nm (idler) via the crystal temperature and poling period. By all-electronic tuning of the fiber laser wavelength over 19 nm, tuning of the mid-infrared idler wavelength over 195 nm was achieved.
We report self-starting mode-locking of a diode-pumped super-stretched unidirectional ring laser ... more We report self-starting mode-locking of a diode-pumped super-stretched unidirectional ring laser based on a 26 m cladding-pumped Yb3+-fiber and an internal grating dispersion compensation. The long fiber resulted in an extremely high pulse stretching ratio inside the cavity of about 500 which is more than one order of magnitude above previously demonstrated laser systems. This system was passively mode-locked by
A diode-pumped mode-locked double clad Yb3+-fiber ring laser with up to 118 nm bandwidth, a repet... more A diode-pumped mode-locked double clad Yb3+-fiber ring laser with up to 118 nm bandwidth, a repetition rate of 7.6 MHz and a maximum output power of 2.8 W is presented. The broad bandwidth is achieved by suppressing the long wavelength components in the dispersive grating line of the resonator.
Summary form only given. We report on a widely tunable narrow linewidth ytterbium-doped fiber rin... more Summary form only given. We report on a widely tunable narrow linewidth ytterbium-doped fiber ring laser device with a linearly polarized output power of 10 W. The Large Mode Area (LMA) core of the 20 m long fiber had a diameter of 10 /spl mu/m and was doped with 1000 ppm ytterbium. The core was transverse single-mode for wavelengths above 1 /spl mu/m. The pump-cladding was D-shaped in order to improve the pump light absorption. As pump source we used a fiber coupled 980 nm laser diode. The small quantum defect between the pump and the laser wavelength enables a very high efficiency. At maximum pump power of nearly 32 W a linearly polarized output power of 10 W with a slope efficiency of 68% with respect to the absorbed pump power at a wavelength of 1080 nm was achieved.
We present experimental results, which show that the up-chirp of dispersively stretched femtoseco... more We present experimental results, which show that the up-chirp of dispersively stretched femtosecond pulses decreases linearly with increasing pulse energy after amplification in Erbium-doped fibers. For 6 microJ output pulses a nonlinear dispersion of -410(6) fs(2) was measured. This nonlinear dispersive effect is attributable to the resonant dispersion of the Erbium-ions and the decrease of the inversion during pulse amplification and was about one order of magnitude larger than predicted by the literature. Most likely this deviation is attributable to the complex population dynamics of the Er3+-ions during pulse amplification, since in the literature the relation between the refractive index and Er3+-inversion was described for a quasi-static population distribution. Due to the high resonant dispersion the required compressor dispersion for minimum output pulse duration depends strongly on the output pulse energy in Erbium-doped fiber-based chirped-pulse-amplifier set-ups.
Amplification of chirped fs-pulses in an Erbium doped fiber amplifier upto 0.8μJ resulted in an a... more Amplification of chirped fs-pulses in an Erbium doped fiber amplifier upto 0.8μJ resulted in an additional peak in the spectrum at 1584nm. This peak, attributable to four-wave-mixing between the signal centered at 1559nm and amplified spontaneous emission at 1534nm, hinders the temporal recompression of the amplified chirped pulse. Compared to the forward pumping configuration, this four-wave-mixing in the amplifier was
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