High-power frequency comb at 2  μm wavelength emitted by a Tm-doped fiber laser system

Gaida, Christian; Heuermann, Tobias; Gebhardt, Martin; Shestaev, Evgeny; Butler, Thomas P.; Gerz, Daniel; Lilienfein, Nikolai; Sulzer, Philipp; Fischer, Marc; Holzwarth, Ronald; Leitenstorfer, Alfred; Pupeza, Ioachim; Limpert, Jens

doi:10.1364/ol.43.005178

Cited by 28 publications

(27 citation statements)

References 28 publications

(36 reference statements)

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“…One further important advantage that laser-based sources can offer is the ability lock the carrier envelope offset of the pulse. Considering that the long wavelength DFG spectrum is intrinsically waveform-stable, and both PCF [44] and fluoride fiber [33] broadening should preserve the coherence of the multi-octave output, it is conceivable that such a multi-channel synthesis could produce high-repetition rate sub-cycle transients [60]. For example, the full spectrum in figure 7 supports an ∼5 fs Fourier transform limited pulse duration at a center frequency of 137 THz (7 fs period).…”

Section: Discussionmentioning

confidence: 99%

“…This commercial Er:fiber oscillator offers a stable (RIN of <0.1% rms from 1 Hz to 1 MHz) and reliable pulse train, as well as the opportunity to stabilize both the repetition frequency and the carrier envelope offset frequency of the pulse train. While not directly utilized in this work, this capability provides a starting point to ensuring and exploiting the full frequency comb nature of the following spectral broadening stages [44].…”

Section: Introductionmentioning

confidence: 99%

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Multi-octave spanning, Watt-level ultrafast mid-infrared source

Butler

Lilienfein

et al. 2019

J. Phys. Photonics

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We present a source of brilliant mid-infrared radiation, seamlessly covering the wavelength range between 1.33 and 18 μm (7500-555 cm −1 ) with three channels, employing broadband nonlinear conversion processes driven by the output of a thulium-fiber laser system. The high-average-power femtosecond frontend delivers a 50 MHz train of 250 fs pulses spectrally centered at 1.96 μm. The three parallel channels employ soliton self-compression in a fused-silica fiber, supercontinuum generation in a ZBLAN fiber, and difference-frequency generation in GaSe driven by soliton selfcompressed pulses. The total output enables spectral coverage from 1.33 to 2.4 μm, from 2.4 to 5.2 μm, and from 5.2 to 18 μm with 4.5 W, 0.22 W and 0.5 W, respectively. This spatially coherent source with a footprint of less than 4 m 2 exceeds the brilliance of 3rd-generation synchrotrons by more than three orders of magnitude over 90% of the bandwidth.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Butler

Lilienfein

et al. 2019

J. Phys. Photonics

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“…spectral broadening stage has recently been identified as the major performance limiting factor in the further development of high power frequency comb sources at 2 µm 4,10 .…”

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confidence: 99%

Low noise all-fiber amplification of a coherent supercontinuum at 2 µm and its limits imposed by polarization noise

Heidt

Hodasi

Rampur

et al. 2020

Sci Rep

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We report a low noise, broadband, ultrafast Thulium/Holmium co-doped all-fiber chirped pulse amplifier, seeded by an Erbium-fiber system spectrally broadened via coherent supercontinuum generation in an all-normal dispersion photonic crystal fiber. The amplifier supports a − 20 dB bandwidth of more than 300 nm and delivers high quality 66 fs pulses with more than 70 kW peak power directly from the output fiber. The total relative intensity noise (RIN) integrated from 10 Hz to 20 MHz is 0.07%, which to our knowledge is the lowest reported RIN for wideband ultrafast amplifiers operating at 2 µm to date. This is achieved by eliminating noise-sensitive anomalous dispersion nonlinear dynamics from the spectral broadening stage. In addition, we identify the origin of the remaining excess RIN as polarization modulational instability (PMI), and propose a route towards complete elimination of this excess noise. Hence, our work paves the way for a next generation of ultra-low noise frequency combs and ultrashort pulse sources in the 2 µm spectral region that rival or even outperform the excellent noise characteristics of Erbium-fiber technology.

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“…This commercial source (Menlo C-Fiber) generated 2-μm pulses from a 1550-nm Er:fiber seed oscillator which was amplified and Raman shifted in a subsequent nonlinear fiber. Stretched pulses with a center wavelength of 1965 nm were subsequently amplified in two thulium-doped fibers boosting the average power of the pulse train to a maximum of 100 W [22]. Due to absorption by ambient water vapor, the entire high-power free-space beam path was housed in vacuum chambers at a pressure of <1 mbar, avoiding thermal lensing and preserving the beam quality [23].…”

mentioning

confidence: 99%

Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region

et al. 2019

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We report a coherent mid-infrared (MIR) source with a combination of broad spectral coverage (6-18 μm), high repetition rate (50 MHz), and high average power (0.5 W). The waveform-stable pulses emerge via intrapulse differencefrequency generation (IPDFG) in a GaSe crystal, driven by a 30-W-average-power train of 32-fs pulses spectrally centered at 2 μm, delivered by a fiber-laser system. Electro-optic sampling (EOS) of the waveform-stable MIR waveforms reveals their single-cycle nature, confirming the excellent phase matching both of IPDFG and of EOS with 2-μm pulses in GaSe.

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High-power frequency comb at 2 μm wavelength emitted by a Tm-doped fiber laser system

Cited by 28 publications

References 28 publications

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Low noise all-fiber amplification of a coherent supercontinuum at 2 µm and its limits imposed by polarization noise

Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region

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