Abstract
Controlling the temporal and spectral properties of ultrashort laser pulses in the visible and near-infrared spectral range by means of a femtosecond pulse-shaping device is a powerful tool with many applications in ultrafast spectroscopy. A major and successful concept is known as the 4f design, which has a symmetric zero-dispersion-compressor geometry. Most 4f pulse shapers rely on using transmissive optics in their beam path limiting the operational wavelength ranges. In the present contribution, we use an all-reflective shaping setup to generate a phase-locked 266 nm double pulse to benchmark its performance in the limit of short wavelengths. The setup comprises the complete spectral amplitude and phase diagnostics for quantitative analysis of the pulse properties before and after the shaper using the technique of frequency-resolved optical gating. The measured time–frequency spectra are in good agreement with optical simulations. The geometry and hardware of the device including the optical components are designed, such that all harmonics of the deep UV pulses travel the same path, giving the instrument the ability to work with soft X-ray pulses, under vacuum conditions, down to the few-nanometer wavelength scale.
Highlights
Conventional 4f pulse shapers typically utilise several transmissive optical components in their beam path for focusing and pulse manipulation
We discuss the performance of an all-reflective 4f pulse shaper operating at short wavelength in grazing incidence using a femtosecond 266 nm-deep ultraviolet (DUV) pulse to test the functionality of the device and displaying the feasibility of such a system
In our previous research and development work on a prototypical setup, we focused predominately on simulating a theoretical auto-correlation signal of the DUV double pulses [11]
Summary
Conventional 4f pulse shapers typically utilise several transmissive optical components in their beam path for focusing and pulse manipulation. The latter can be realized, for instance, by an acousto-optical modulator (AOM), where a piezoelectric transducer creates sound waves in a material like germanium, or by spatial light modulators (SLM) based on pixelated liquid-crystal technology allowing for
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