info@axiomoptics.com    (617) 401-2198

at Imagine Optic Inc.

1 Broadway, 14th floor,

Cambridge, MA 02142, USA

Ph: (617) 401-2198       Fax: (425) 930-9818

info@axiomoptics.com

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PHADIM is

manufactured by

The propagation of laser pulses through any prisms and wedges diverts the propagation direction of different spectral components and hence spectrally disperses the beam. If the spectral components are plane waves, then the propagation direction angular dispersion determined by the angle between the propagation directions of the components equals the phase front angular dispersion (PFAD) determined by the angle between their phase fronts. In case of Gaussian-beams, however, the phase fronts may be curved therefore the two definitions can give different values. The PFAD is the most relevant definition because if not negligible, it generates chirping and consequently temporal lengthening of the pulse along with deterioration of the temporal contrast. In the spatial domain, the beam profile becomes spectrally asymmetric along the plane of angular dispersion.

Phase Front Angular Dispersion (PFAD) have the following negative effects in ultrafast lasers :

- Spectral frequency modulation ( chirping)
- Spatial Chirp
- Temporal pulse broadening
- Tilted pulse front

Our solution for PFAD diagnostics is a system combining PhADIM (Phase Front Angular Dispersion by Inverted Mach-Zehnder Interferometer), with CEOptics CEO-2D-800 or CEO-2D-800-V imaging spectrograph and FRINGER software.

         

It is a powerful solution providing a measurement of ultrafast laser PFAD with an extreme accuracy better than 0.1 μrad/nm. Due to its simple design, our solution is easy to handle and does not require advanced skills. It only take a few minutes to align and measure. Our device is capable of real-time diagnostics independent of pulse parameters such as  duration, energy, wavelength and polarization.

PHADIM features:

- all linear optical solution

- independent of wavelength (suitable for (V)UV- (N)IR)

- low input power / pulse energy

- high accuracy (0.1 μrad/nm)

- real time operation

- simple to align and operate