Tunable pulses from below 300 to 970 nm with durations down to 14 fs based on a 2 MHz ytterbium-doped fiber system

Schriever, Christian; Lochbrunner, Stefan; Krok, Patrizia; Riedle, Eberhard

doi:10.1364/ol.33.000192

Cited by 73 publications

(29 citation statements)

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“…49,50 The NOPA is pumped by the second and third harmonics of a CMXR Impulse Yb-doped fiber laser operating at 1,035 nm with a variable repetition rate from 0.2 to 2 MHz, 10 μJ per pulse energy, and ~250 fs pulse duration. The white light continuum generated by the fundamental beam seeds the amplification of the parametric emission, which is pumped by the second and third harmonics, to generate tunable pulses in the 680-900 and 500-650 nm (1. mPP spectra are recorded with a SPECS Phoibos 100 hemispherical analyzer, which is equipped with a Delay Line Detector (DLD).…”

Section: Methodsmentioning

confidence: 99%

Ultrafast multiphoton pump-probe photoemission excitation pathways in rutileTiO2(110)

et al. 2015

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We investigate the spectroscopy and photoinduced electron dynamics within the conduction band of reduced rutile TiO 2 (110) surface by multiphoton photoemission (mPP) spectroscopy with wavelength tunable ultrafast (~20 fs) laser pulse excitation. Tuning the mPP photon excitation energy between 2.9 and 4.6 eV reveals a nearly degenerate pair of new unoccupied states located at 2.73±0.05 and 2.85±0.05 eV above the Fermi level, which can be analyzed through the polarization and sample azimuthal orientation dependence of the mPP spectra. Based on the calculated electronic structure and optical transition moments, as well as related spectroscopic evidence, we assign these resonances to transitions between Ti 3d-bands of nominally t 2g and e g symmetry, which are split by crystal-field. The initial states for the optical transition are the reduced Ti 3+ states of t 2g symmetry populated by formation oxygen vacancy defects, which exist within the band gap of TiO 2 . Furthermore, we studied the electron dynamics within the conduction band of TiO 2 by three-dimensional (3D) time-resolved pump-probe interferometric mPP measurements. The spectroscopic and time-resolved studies reveal competition between 2PP and 3PP processes where the t 2g -e g transitions in the 2PP process saturate, and are overtaken by the 3PP process initiated by the band gap excitation from the valence band of TiO 2 .

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Section: Methodsmentioning

confidence: 99%

Ultrafast multiphoton pump-probe photoemission excitation pathways in rutileTiO2(110)

et al. 2015

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“…However, they require rather high pump energies, typically provided by amplified laser systems, limiting the repetition rate to a few hundred kilohertz [5][6][7]. Recently, the repetition rate of OPAs has been pushed to the MHz range by using laser oscillators with cavity dumping [8][9][10] or fiber amplifiers [11,12]. Later on, an OPA with 50 MHz repetition rate pumped by a frequency-doubled Yb:fiber amplifier and seeded by a supercontinuum has been demonstrated [13].…”

Section: Introductionmentioning

confidence: 99%

Broadly tunable femtosecond near- and mid-IR source by direct pumping of an OPA with a 417 MHz Yb:KGW oscillator

Krauth¹,

Steinmann²,

Hegenbarth³

et al. 2013

Opt. Express

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Abstract:We generate over half a watt of tunable near-IR (1380-1830 nm) and several hundred milliwatts in the mid-IR (2.4-4.2 µm) as well as milliwatt level mid-IR (4.85-9.33 µm) femtosecond radiation by pumping an optical parametric amplifier directly with a 7.4 W Yb:KGW oscillator at 41.7 MHz repetition rate. We use 5 mm PPLN and 2 mm GaSe as downconversion crystals and seed this process by a supercontinuum from a tapered fiber. The system is extremely simple and very stable and could replace more complex OPOs as tunable light sources. repetition rate tunable femtosecond pulses and broadband amplification from fiber laser pumped parametric amplifier," Opt. Express 14(11), 4765-4773 (2006). 12. C. Schriever, S. Lochbrunner, P. Krok, and E. Riedle, "Tunable pulses from below 300 to 970 nm with durations down to 14 fs based on a 2 MHz ytterbium-doped fiber system," Opt. Lett. 33(2), 192-194 (2008). Chu, "Broadband tunable optical parametric amplification from a single 50 MHz ultrafast fiber laser," Opt.

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“…The generation of visible light from optically-pumped solid-state and semiconductor lasers is usually achieved via second harmonic generation (SHG), as the transition lines of most conventional doped dielectric laser crystals and the semiconductor bandgaps of the most common III-V semiconductor alloys are in the near infrared (NIR). SHG has been demonstrated for numerous diode-pumped solid-state (DPSS) lasers, both in continuous wave (CW) and pulsed [1,2] operation, fiber lasers [3], and external cavity diode lasers (ECDL) [4]. One of the main limitations to the SHG-based visible light sources is that these devices are limited by the available NIR laser lines.…”

Section: Introductionmentioning

confidence: 99%

Singly-resonant sum frequency generation of visible light in a semiconductor disk laser

Andersen¹,

Schlosser²,

Hastie³

et al. 2009

Opt. Express

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In this paper a generic approach for visible light generation is presented. It is based on sum frequency generation between a semiconductor disk laser and a solid-state laser, where the frequency mixing is achieved within the cavity of the semiconductor disk laser using a singlepass of the solid-state laser light. This exploits the good beam quality and high intra-cavity power present in the semiconductor disk laser to achieve high conversion efficiency. Combining sum frequency mixing and semiconductor disk lasers in this manner allows in principle for generation of any wavelength within the visible spectrum, by appropriate choice of semiconductor material and single-pass laser wavelength

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Tunable pulses from below 300 to 970 nm with durations down to 14 fs based on a 2 MHz ytterbium-doped fiber system

Cited by 73 publications

References 0 publications

Ultrafast multiphoton pump-probe photoemission excitation pathways in rutileTiO2(110)

Ultrafast multiphoton pump-probe photoemission excitation pathways in rutileTiO2(110)

Broadly tunable femtosecond near- and mid-IR source by direct pumping of an OPA with a 417 MHz Yb:KGW oscillator

Singly-resonant sum frequency generation of visible light in a semiconductor disk laser

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