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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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Published on: December 30, 2025

Broadband spatiotemporal axicon fields.

Rahul Dutta, Kimmo Saastamoinen, Jari Turunen

|November 18, 2014

Summary

This summary is machine-generated.

This study compares reflective and diffractive axicons for generating broadband optical fields. Different illumination types reveal unique spatiotemporal properties, aiding optical applications requiring precise field localization.

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Area of Science:

Optics and Photonics
Wave Phenomena

Background:

Axicons are optical elements that generate non-diffracting beams.
Understanding the behavior of broadband optical fields is crucial for advanced optical systems.

Purpose of the Study:

To investigate and compare the properties of optical fields generated by reflective and diffractive axicons.
To analyze the influence of spectral coherence on the output field characteristics.
To identify the physical principles underlying the differences between the two axicon types.

Main Methods:

Theoretical analysis of optical field propagation through axicons.
Evaluation of spatiotemporal field shape for coherent pulses.
Assessment of spatiotemporal coherence properties for incoherent light.
Comparison of output fields under identical spectral conditions.

Main Results:

Reflective axicons produce fields with a frequency-independent cone angle.
Diffractive axicons generate fields with a frequency-independent transverse scale.
Distinct spatiotemporal characteristics arise from different illumination coherence states.
Physical origins of the observed field differences are elucidated.

Conclusions:

The choice of axicon (reflective vs. diffractive) significantly impacts broadband optical field properties.
Illumination coherence plays a critical role in shaping the output field's spatiotemporal characteristics.
The findings provide insights for designing optical systems demanding joint spatial and temporal field localization.