.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/thin_films/plot_bragg_mirror.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_thin_films_plot_bragg_mirror.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_thin_films_plot_bragg_mirror.py:


Dielectric Bragg mirror
=======================

Build an alternating high/low-index quarter-wave stack and observe how adding
layer pairs increases reflectance around the design wavelength.

.. GENERATED FROM PYTHON SOURCE LINES 10-31

.. code-block:: Python

    import matplotlib.pyplot as plt
    import numpy
    from TypedUnit import ureg

    from PyOptik import ThinFilmLayer, thin_film_stack


    design_wavelength = 800 * ureg.nanometer
    high_index, low_index = 2.25, 1.45
    wavelengths = numpy.linspace(500, 1100, 700) * ureg.nanometer


    def mirror_layers(pair_count):
        """Return ``pair_count`` high/low quarter-wave layer pairs."""
        pair = [
            ThinFilmLayer(high_index, design_wavelength / (4 * high_index)),
            ThinFilmLayer(low_index, design_wavelength / (4 * low_index)),
        ]
        return pair * pair_count









.. GENERATED FROM PYTHON SOURCE LINES 32-51

.. code-block:: Python

    figure, axis = plt.subplots(layout="constrained")
    for pair_count in (2, 4, 8):
        result = thin_film_stack(
            wavelengths,
            mirror_layers(pair_count),
            substrate_index=1.52,
        )
        axis.plot(wavelengths.magnitude, 100 * result.reflectance, label=f"{pair_count} pairs")

    axis.axvline(design_wavelength.magnitude, color="black", linestyle="--", alpha=0.6)
    axis.set(
        xlabel="Wavelength [nm]",
        ylabel="Reflectance [%]",
        title="Quarter-wave dielectric mirror",
        ylim=(0, 101),
    )
    axis.grid(alpha=0.25)
    axis.legend()
    plt.show()



.. image-sg:: /gallery/thin_films/images/sphx_glr_plot_bragg_mirror_001.png
   :alt: Quarter-wave dielectric mirror
   :srcset: /gallery/thin_films/images/sphx_glr_plot_bragg_mirror_001.png
   :class: sphx-glr-single-img






.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 2.201 seconds)


.. _sphx_glr_download_gallery_thin_films_plot_bragg_mirror.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_bragg_mirror.ipynb <plot_bragg_mirror.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_bragg_mirror.py <plot_bragg_mirror.py>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_