Self-compression at 1 µm wavelength in all-bulk multi-pass geometry

Gröbmeyer, Sebastian; Fritsch, Kilian; Schneider, Benedikt; Poetzlberger, Markus; Pervak, Vladimir; Brons, Jonathan; Pronin, Oleg

doi:10.1007/s00340-020-07506-4

Cited by 35 publications

(20 citation statements)

References 23 publications

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“…As with other types of quasi-waveguides [14,[22][23][24][25], in this frontend self-phase modulation (SPM) is the main effect exploited to achieve spectral broadening, but nonlinear phase shift per plate is limited such that the spatial and temporal quality of the input beam is maintained after the plates [8,30]. For the multiplate waveguide described in this work, the reduction of peak intensity due to material dispersion is not compensated via recompression with dispersive optics as for the multipass cells.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…Here, the nonlinear distortion of the beam caused by self-focusing led to a degradation of the beam quality after two stages of bulk media and required additional spatial filtering, limiting the achievable throughput efficiency [20]. In recent years, efficient and robust compression of KLM Yb:YAG TD oscillators with multipass cells [14,[22][23][24][25] has been shown. Multipass cells consist of focusing elements (concave dispersive mirrors) and a nonlinear medium into which the beam is imaged several times.…”

Section: Introductionmentioning

confidence: 99%

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Efficient nonlinear compression of a thin-disk oscillator to 8.5 fs at 55 W average power

Barbiero,

Wang,

Graßl

et al. 2021

Preprint

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We demonstrate an efficient hybrid-scheme for nonlinear pulse compression of high-power thindisk oscillator pulses to the sub-10 fs regime. The output of a home-built, 16 MHz, 84 W, 220 fs Yb:YAG thin-disk oscillator at 1030 nm is first compressed to 17 fs in two nonlinear multipass cells. In a third stage, based on multiple thin sapphire plates, further compression to 8.5 fs with 55 W output power and an overall optical efficiency of 65% is achieved. By sending the 2.5-cycle pulses into a lithium iodate crystal, we were able to generate ultra-broadband mid-infrared pulses covering the spectral range 2.4-8 µm.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient nonlinear compression of a thin-disk oscillator to 8.5 fs at 55 W average power

Barbiero,

Wang,

Graßl

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Whereas the majority of reported experiments rely on a single Kerr medium within the MPC, a hybrid multipass multiplate approach was implemented. [ 10 ] By this method, the hitherto published femtosecond pulse compression factors from a single bulk MPC [ 11–13 ] were clearly surpassed. Three 1 mm thin antireflection (AR) coated silica plates with 3 cm spacing were placed in the center of an about 350 mm long MPC.…”

Section: Laser Setupmentioning

confidence: 99%

Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain

Seidel

Pressacco

Akcaalan

et al. 2022

Laser & Photonics Reviews

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The Free‐Electron Laser (FEL) FLASH offers the worldwide still unique capability to study ultrafast processes with high‐flux, high‐repetition rate extreme ultraviolet, and soft X‐ray pulses. The vast majority of experiments at FLASH are of pump–probe type. Many of them rely on optical ultrafast lasers. Here, a novel FEL facility laser is reported which combines high average power output from Yb:YAG amplifiers with spectral broadening in a Herriott‐type multipass cell and subsequent pulse compression to sub‐100‐fs durations. Compared to other facility lasers employing optical parametric amplification, the new system comes with significantly improved noise figures, compactness, simplicity, and power efficiency. Like FLASH, the optical laser operates with 10‐Hz burst repetition rate. The bursts consist of 800‐μs long trains of up to 800 ultrashort pulses being synchronized to the FEL with femtosecond precision. In the experimental chamber, pulses with up to 50‐μJ energy, 60‐fs full‐width half‐maximum duration and 1‐MHz rate at 1.03‐μm wavelength are available and can be adjusted by computer‐control. Moreover, nonlinear polarization rotation is implemented to improve laser pulse contrast. First cross‐correlation measurements with the FEL at the plane‐grating monochromator photon beamline are demonstrated, exhibiting the suitability of the laser for user experiments at FLASH.

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“…In nonlinear media, the propagation of few-cycle pulses is influenced by the χ (3) -effects of self-focusing and self-phase modulation, and a proper control of the material parameters can result in a significant reduction in pulse duration. Over the past few years, fiber-based [73] approaches as well as bulk compression schemes have already been successfully demonstrated in our group [85,319,320] and more experimental research is currently undertaken with Cr:ZnS/ZnSe-based systems.…”

Section: A New Ultrafast Workhorse For Spectroscopicmentioning

confidence: 99%

A New Generation of Ultrafast Oscillators for Mid-Infrared Applications

Nagl¹

2021

Springer Theses

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The mid-infrared (MIR) spectral range with wavelengths between 2 µm and 20 µm holds tremendous potential for the study of complex biological systems, given the abundance of intense and unique molecular absorption lines that can be detected. Consequently, spectroscopic applications of mid-infrared radiation have garnered enormous attention in recent years. A particularly striking example is the combination of multi-MHz-repetition-rate, few-cycle MIR light sources with electric-field-resolved techniques, enabling the recording of amplitude-and phase-resolved molecular signals with unparalleled specificity and shot noise limited sensitivity. Despite the ever-growing research demand, their widespread use is severely hampered by the lack of low-noise, compact, and ultrafast laser systems.In this dissertation, a new generation of table-top mid-infrared laser sources is presented, bringing cutting-edge laser diode technology and few-cycle Cr 2+ :ZnS/ZnSe solid-state oscillators together for the first time. Not only have these laser systems proven to reliably provide coherent radiation in the 2 µm to 3 µm region, the simultaneous reduction in size and complexity, accompanied by an improved overall efficiency and -most importantly -noise performance, renders this approach as pioneering for future MIR applications.In total, three laser systems are developed, each of them pushing the frontiers of directly diode-pumped laser technology. The first one is driven by a single-emitter indium phosphide laser diode and delivers more than 500 mW of output power combined with pulse durations as short as 45 fs. With this first ever directly diodepumped Kerr-lens mode-locked (KLM) Cr 2+ :ZnS/ZnSe oscillator, experimental results confirm a highly stable operation. In addition, amplitude noise measurements reveal an excellent low-noise performance of the mode-locked laser output.Driven by the desire to match and exceed the performance of more mature fiber-laser-pumped counterparts and also to boost the efficiency of the envisaged downstream applications, the output of two single-emitter pump laser diodes is carefully combined and implemented into a second-generation design. The achieved peak powers are almost three-times higher compared to before, while the low-noise performance of the KLM output is maintained.xii Typically, the design architecture of laser systems used for generating mid-infrared radiation up to several tens of microns includes a sophisticated chain of amplification, pulse compression and parametric conversion stages. Using a powerful few-cycle mid-infrared oscillator as driving laser source instead not only significantly improves the effectiveness of these nonlinear schemes, but could even supersede the need for initial amplification. The presented third-generation system brings the directly diode-pumped Cr 2+ :ZnS/ZnSe solid-state laser technology to a new level; with output peak powers reaching 1 MW and pulse durations as short as 28 fs, direct generation of CEP-stable mid-infrared pulses in a nonlinear optical cryst...

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Self-compression at 1 µm wavelength in all-bulk multi-pass geometry

Cited by 35 publications

References 23 publications

Efficient nonlinear compression of a thin-disk oscillator to 8.5 fs at 55 W average power

Efficient nonlinear compression of a thin-disk oscillator to 8.5 fs at 55 W average power

Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain

A New Generation of Ultrafast Oscillators for Mid-Infrared Applications

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