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We present the first systematic study of the spatio-spectral polarization properties of a supercontinuum generated in a cubic crystal, yttrium–aluminum garnet (YAG), including a full spectral analysis of the white light core and surrounding ring structure. We observe no depolarization of the supercontinuum, and no spatial dependence of polarization ratios for any wavelength. We discuss the discrepancy...
We present an optical frequency comb based Fourier Transform Spectrometer, covering 3.0 to 5.2 μm with 2 m optical path delay and a signal-to-noise ratio of 800 in 40 s acquisition time at 4.6 μm.
Coherent frequency conversion processes for frequency combs (FCs) are intensively studied as they inter alia enable the use of FCs for precision spectroscopy in the important mid-infrared (MIR) spectral region not covered by laser gain media. Difference frequency generation (DFG) is one promising approach for a simple and robust scheme to generate phase-stable MIR FCs. When used in a spectroscopy...
In this contribution we report on research of the interaction between optical near-fields of periodic nanostructures and free-electron beams with potential application in future miniaturized laser-based accelerating devices [1, 2], in ultrafast electron microscopy or diffraction experiments [3, 4] or in photon-induced near-field electron microscopy [5]. Here we experimentally demonstrate a technique...
Optimization of gain depletion in Ho:YLF regenerative amplifiers resulted in highly stable pulses with fluctuations of 0.35%. Integration of an intra-cavity-etalon decreased the pulse duration to 1.2 ps, while having pulse energies of 4 mJ.
We show experimentally and numerically that pump intensity noise in soliton fiber oscillators is predominantly coupled to the Kelly sidebands, while noise coupling to the soliton is damped.
We present Ar-filled Kagome fiber based nonlinear pulse compression of 225 μJ, 1.8 ps pulses from a Ho:YLF amplifier to 285 fs at 125 μJ, supporting a FL duration of 250 fs at 2.05μm.
The dynamics and stability of Ho:YLF regenerative amplifiers is studied experimentally and numerically, whereas operating conditions are analyzed with respect to energy fluctuations. We propose a low-noise laser design operating at a second stability point.
We present soliton operation of holmium-doped fiber oscillators with independently tunable central wavelengths from 2040nm to 2070nm and spectral widths from 5nm to 10nm, which can be matched to the requirements of Ho:YLF amplifiers.
We present a novel full 3+1D split-step numerical model for white-light generation including all major physical effects. We present a detailed spatial mode analysis and derive imaging systems to re-shape the spatial distribution.
We present a new approach to study repetition-rate multiplication of pulse trains via the Talbot-effect. Periodic functions are utilized to represent the spectral phase, enabling the calculation of temporal phase patterns for the first time.
We demonstrate a mid-infrared frequency comb of unprecedented tunability covering the entire 3–10 μm fingerprint region. The comb is based on a Raman shifted Yb:fiber laser and difference frequency generation.
We report a Yb:fiber frequency comb using an intra-cavity electro-optic modulator and an acousto-optic modulator outside the cavity. The integrated phase noise error was 112mrad for f0 and 564mrad for an optical lock at 698nm.
Significant progress in Yb-fiber laser based frequency combs over the last few years resulted in Hz-level optical linewidths, GHz comb spacings and average powers over 80 W enabling nonlinear frequency conversion and many novel applications.
The molecular fingerprint region from 2 – 10 °m is currently receiving a lot of interest due to its potential for enabling the identification of many important molecules in biological and medical applications. Particularly mid-IR comb laser systems are highly sought, since they could potentially revolutionize mid-IR and far IR spectroscopy. However, to date no robust comb technology operating in the...
Highly coherent optical frequency combs have applications ranging from broadband spectroscopy with high sensitivity and accuracy [1], to the spectral dissemination of optical frequency references [2], where coherently linking the visible spectrum to the telecom band is important for the development of novel ultra-stable lasers in the 1.5 µm spectral region as well as long-haul optical carrier transfer...
We present a highly coherent Yb-fiber laser based frequency comb spanning nearly 1.5 spectral octaves. The coherence properties are investigated by optical beat experiments and numerical simulations.
We demonstrate wavelength tunable coherent Raman soliton generation in a Tm fiber amplifier seeded with a passively mode locked Tm fiber oscillator and subsequent octave spanning continuum generation in highly-nonlinear fibers.
A femtosecond thulium-doped passively modelocked fiber laser with internal dispersion compensation is presented. It generates pulses at a center wavelength of 1985nm with a dechirped pulse duration of 320 fs and an energy of 3.5 nJ. Pulsed operation is achieved using additive pulse mode locking, dispersion compensation is facilitated by an internal grating arrangement.
We report on an ultrafast normal dispersion erbium fiber laser generating 10 nJ pulses externally compressed to ≪75 fs. The impact of spectral filtering on the mode-locking is discussed via phase noise measurements.
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