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Suppression of detrimental modal interference effects within a cladding-pumped multimode thulium fiber amplifier is achieved using variable bandwidth seed source. The amplifier produced pulse energies of 1.1mJ and peak powers over 20kW at 1956nm.
We report efficient and robust Kerr-lens mode-locking of single-mode and tapered diode-pumped Cr:LiSAF lasers by using gain-matched output couplers. Sub-15-fs pulses were generated with peak powers above 60-kW and optical-to-optical conversion efficiencies up to 21%.
We demonstrate passive synchronization between Ti:sapphire and Yb-doped fiber mode-locked lasers with long-term stability for 6 h with the aid of active temperature stabilization. A timing jitter of 0.75 fs was achieved between two-color pulses.
We report carrier-envelope offset beat detection (52-dB signal-to-noise ratio at 100-kHz resolution bandwidth) with a common-path 2f-to-3f self-referencing interferometer with a dual-pitch periodically poled lithium niobate ridge waveguide.
Stable and self-starting passively mode-locked pulses of 6 ps, 465 W peak power, are produced from a holmium-praseodymium co-doped ring fiber laser at 2.9 µm, with a repetition rate of 24.8 MHz.
The interaction of a laser filament with micro-sized water droplets was studied to further understand the energy dissipation of filaments in aerosol media. The analysis of the shockwave formation allows the quantification of the energy balance during the interaction and discuss the survival of filaments in perturbed propagation media.
We describe the performance of an optimized high-temperature DS-DBR laser used as an uncooled WDM source. Constant wavelength output with less than 6GHz error without mode-hopping is shown for C-band channels from 70–90 °C.
Using a commercial, diode-side pumped Nd:YAG rod laser module, we obtain more than 53% extraction efficiency in fundamental mode with respect to multimode operation in a fully polarized beam.
The free electron density in a 40 mm long filamentation generated by carrier-envelope stabilized few-cycle laser pulses is detected in a circular loop. The oscillation of electron density is observed as a function of CEP.
Laser-wakefield-accelerated electrons were used to drive an all-optical undulator source, a 5-keV betatron X-ray source and a tunable quasi-monochromatic Compton-X-ray source. Also, we present a phase-contrast tomogram of a fly obtained with the betatron beam.
We present a CEO-stabilization technique based on optical feedback to an intra-cavity SESAM with significantly improved bandwidth compared to standard pump current control, enabling a CEO-locked Er:Yb:glass laser with ten times lower residual phase noise.
We present the first phase stabilization of the carrier-envelope-offset frequency of a SESAM-modelocked thin disk laser (<120 mrad at 1 Hz–1 MHz) and measure the influence of different noise sources such as multi-transverse-mode high-power diode-pumping.
We demonstrate a 160 mW output, 13C2H2 frequency-stabilized erbium silica fiber laser. The frequency stability reached 8.8×10−12 for τ=100 s. Furthermore, a linewidth of 5 kHz and a RIN of −130 dB/Hz were simultaneously achieved.
We demonstrate a new phase-locking technique for long-term and high-precision stabilization of mode-locked Er-fiber lasers by direct optical-microwave phase detection without high-speed photodiodes and mixers. The excellent locking performance reaches 2.1×10−18 at 4000-s averaging time.
Presented here is a highly stable CW THz generation utilizing a dual-mode laser capable of producing a wide range of differential frequencies. This laser employs an AOTF in a single external cavity for dual-mode selection.
We developed a method to stabilize the carrier-envelope phase of a 20 TW Ti:Sapphire laser operating at 10 Hz. Phase-dependent features were observed in the high-order harmonic spectrum generated using Generalized Double Optical Gating.
A 4-GHz optical frequency comb with a laser-diode pumped Yb:Y2O3 ceramic oscillator is demonstrated. Each comb tooth was resolved by a home-made, sub-gigahertz frequency resolution grating spectrograph, which would be useful for many small observatories.
We report direct generation of 500MHz Yb:fiber laser frequency comb. The offset frequency was stabilized more than 6 hours in an open air environment. The stabilized repetition rate has an in-loop tracking stability of 4.46×10−13/τ1/2.
Toward an all-fiber system, an erbium fiber laser-based comb is directly stabilized to a 12C2H2 transition at 1539.4 nm. The comb fractional instability at 1532.8 nm is 6×10−12 at 100 ms gate time.
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