Hybridizing Multi-pass and Multi-plate Bulk Compression

Seidel, Marcus; Balla, Prannay; Binhammer, Thomas; Frede, M.; Arisholm, Gunnar; Winkelmann, L.; Hartl, Ingmar; Heyl, Christoph M.

doi:10.1051/epjconf/202024321001

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…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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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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“…This simplification enables the derivation of simple analytical equations. Depending on the operation regime, Kerr lensing effects need to be taken into account to allow an accurate estimate of the MPC parameters [32,33], as shown in section 4. The focal spot radii w 01,2 of a beam linearly mode-matched to the fundamental Gaussian eigenmode of a BT-MPC can be calculated as:…”

Section: Bow Tie Multi-pass Cellsmentioning

confidence: 99%

“…Example BT-MPC configurations were tested with a full three-dimensional (3D+1) version of the code, confirming good agreement with the radially symmetric code. The code was previously applied to bulk and MPC broadening simulations [32,34]. We selected thin silica plates as nonlinear media and consider a MPC placed inside a vacuum chamber to avoid ionization at the focus.…”

Section: Numerical Verification Of the Bt-mpc Schemementioning

confidence: 99%

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High-energy bow tie multi-pass cells for nonlinear spectral broadening applications

et al. 2022

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Multi-pass cells have emerged as very attractive tools for spectral broadening and post-compression applications. We discuss pulse energy limitations of standard multi-pass cells considering basic geometrical scaling principles and introduce a novel energy scaling method using a multi-pass cell arranged in a bow tie geometry. Employing nonlinear pulse propagation simulations, we numerically demonstrate the compression of 125mJ, 1 ps pulses to 50 fs using a compact 2 m long setup and outline routes to extend our approach into the Joule-regime.

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