Ultrafast laserapplications

For specified z0, find such a distance z and beam quality M2 at which the wavefront ROC keeps its previously calculated value. + sign is for the far zone, - is for the near zone.

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How to find z: substitute z0 as w0/Vs into formulas for w(z) and R(z), express w0 from both, equate them and solve against z.

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Quadratic equations have two solutions and we have to define a way to point out which solution to take. So the tool has one additional parameter - zone - which can be Near zone or Far zone.

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Changing of real part is equivalent to changing of wavefront ROC R, and changing of imaginary part is equivalent to changing of beam radius w.

Lock front - find such values of free parameters at which the wavefront ROC R and the beam radius w at some axial distance z stay constant when one of the parameters changes.

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The facility allows measurements of time-resolved change of the absorption spectra (Transient Absorption) with femtosecond (10-14 s) time resolution and up to microsecond timescales with spectral windows in UV-VIS-NIR, allowing probing all possible excited state transitions. It consists of LIBRA Ti:Sapphire amplifier (Coherent Inc.), OPerA Solo optical parametric amplifier (Coherent Inc.), Helios transient absorption spectrometer (Ultrafast Systems), and EOS transient absorption spectrometer (Ultrafast Systems). The Ti:Sapphire amplifier delivers 45fs pulses at 1kHz rate, with total power of 4.0W at 800nm wavelength. Optical parametric amplifier allows tuning of the excitation wavelength in the spectral range from 290 – 2600nm, with average power of 50mW and pulse duration 50fs. Transient absorption spectrometer allows measurements in 350 – 1600nm spectral region (probing range), and on <1ms time range.  A recent addition is the MID-IR system (Ultrafast Systems) for direct probing vibrational modes in molecules (3500cm-1 to 800cm-1).  Allowing for the direct monitoring of molecular bonds on light-initiated processes.  This can even be extended to millisecond timescales for monitoring of diffusion limited processes.

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Find beam quality parameter M2 giving specified beam radius at the same axial distance z and with the same waist radius w0.

How to find z: express w02 from formula for R(z), substitute the expression into formula for w(z) and solve it against z.

In optics, the property of some electromagnetic waves of being in phase with one another, as in light from a laser. Machine Translations. Kohärenz ...

For specified waist radius w0, find such a distance z and beam quality M2 at which the wavefront ROC keeps its previously calculated value.

Assigning either real or imaginary part of complex beam parameter, we define both the beam radius w and the wavefront ROC R at the same time.

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The Ultrafast Laser Spectroscopy facility in the Frick Chemistry Laboratory offers state-of-the-art equipment for measuring dynamics in photoactive materials on femtosecond-to-millisecond timescales. The facility in Frick Chemistry Laboratory is open to members of any department at Princeton University. Users from outside the University are welcome, as well. The manager of the facility performs the measurements, as well as offers training for long-term users.

For specified Vs, find such a distance z and beam quality M2 at which the wavefront ROC keeps its previously calculated value.

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Several options for sample mounting are available in order to prevent photo-bleaching/degradation: stirring, translation, and purging with dry N2.  Helios/EOS software includes dispersion compensation algorithm, anisotropy calculation and other useful tools. The measurements at different excitation intensities, wavelengths or at different temperatures of the sample can be automated. Global analysis of the data (three-dimensional array of time-resolved spectra) allows to map the exact pathways and timescales of the processes occurring in the materials of interest. This software is free and can be downloaded from the internet together with the manual and instructions.

The tool Gauss Beam Calculator computes some free parameters of the Gaussian beam when changing one of its parameters and fixing some others. As it is not possible to make all the parameters to be free, we introduce two fixing modes called Lock waist and Lock front.

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Lock waist - find such values of free parameters at which the beam waist w0 stays constant when one of the parameters changes.

Ultrafast laserspectroscopy

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Frick Chemistry Laboratory Princeton University Corner of Washington Road and Scholar Way Princeton, NJ 08544 Front office: 609-258-3900

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Ultrafast laser spectroscopy is a standard method in a number of scientific fields (physics, chemistry, molecular biology, engineering etc.) and is used both as a primary research technique, as well as an accessory characterization tool for supporting the interpretation of the experiments. This technique provides detailed information on the dynamic processes in photoactive materials (in solid and liquid phase). These processes can be excited state relaxation, both inter and intramolecular energy/electron transfer, conformational change (e.g. isomerization), chemical reaction dynamics.