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X-Ray Imaging Systems: Kirkpatrick-Baez Mirrors and Single Grating Interferometer

[February 12, 2021]
In this newsletter, we show two x-ray imaging experiments: (1) Using Kirkpatrick-Baez mirrors to create a nanometer-scale x-ray imaging spot; (2) Illustrating the phase-contrast x-ray imaging principle with a single grating interferometer.
[February 12, 2021]

X-ray imaging is a valuable tool in a wide variety of applications, such as medical imaging and industrial inspection. In VirtualLab Fusion, we have successfully realized several well-known x-ray imaging systems, which can be used to explore the imaging properties of the setup in question, or to illustrate the special x-ray imaging principle. In this newsletter, we show two x-ray imaging experiments: (1) Using Kirkpatrick-Baez mirrors to create a nanometer-scale x-ray imaging spot; (2) Illustrating the phase-contrast x-ray imaging principle with a single grating interferometer.

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High-NA Microscopy Systems with Inclusion of Gratings

[February 04, 2021]
Gratings can be applied in microscopy. Ernst Abbe famously used a grating as the sample to investigate the resolution of a microscopy system. We demonstrate by applying different commercial microscopy lenses (Nikon) combined with gratings in VirtualLab Fusion.
[February 04, 2021]

Gratings, as test samples or as components of systems in their own right, can be applied in microscopy. For example, Ernst Abbe famously used a grating as the sample to investigate the resolution of a microscopy system. The magnified image of the grating is obtained at the image plane. Another example is that of Structured Illumination Microscopy (SIM), which uses the demagnified image of the grating at the focal plane for illuminating the fluorescent samples [R. Heintzmann and C. Cremer, SPIE, 1999]. VirtualLab Fusion provides a straightforward way to model such systems in a fully vectorial manner. We demonstrate by applying different commercial microscopy lenses (Nikon) combined with gratings in VirtualLab Fusion.

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Join our next Webinars on Fiber & Flat Optics!

[February 01, 2021]
Register now for our upcoming webinars on Fiber Optics (03 February) and Flat Optics (04 February)!
[February 01, 2021]

Register now for our next webinars and save your seat.

Fiber Optics – 03 February
Flat Optics – 04 February

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Engineered PSF for High-NA Microscopy Imaging

[January 28, 2021]
We demonstrate in VirtualLab Fusion that different asymmetric PSFs, which are not Airy disks, are obtained when the orientation of the dipole source changes.
[January 28, 2021]

The microscopy imaging techniques are developed rapidly in recent decades. The PSF (Point Spread Function) is very often not an Airy disk at the image plane. A donut shape can be engineered when imaging a dipole source orientated along the longitudinal axis. We demonstrate in VirtualLab Fusion that different asymmetric PSFs, which are not Airy disks, are obtained when the orientation of the dipole source changes. Moreover, a double-helix PSF can be obtained by inserting a certain phase mask in the pupil plane of a microscopy system [Ginni Grover et al., Opt. Exp. 2012]. With such an engineered PSF, even a small defocus of the object can be observed, i.e., the axial resolution can be improved drastically compared to the traditional imaging approach. We demonstrate this phenomenon by applying a commercial microscopy lens (Nikon) system in VirtualLab Fusion.

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Simultaneous Spatial and Temporal Focusing (SSTF)

[January 21, 2021]
We show how to simulate SSTF Setups in VirtualLab Fusion and investigate their characteristics. These setups have the advantage that energy is concentrated in a single spot in the space and time domain which reduces detrimental effects and increases precision.
[January 21, 2021]

For applications in the area of ultrashort pulse laser technologies, where the properties of the field must be controlled in both the space and time domains, “Simultaneous Spatial and Temporal Focusing” (SSTF) is a frequently used technique. Such setups often lead to spatiotemporal effects like the pulse front tilt. We built a commonly used SSTF setup to investigate the spatiotemporal behavior of the field in the focus and the effects of various system parameters on the resulting pulse front tilt.

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Save your Seat for Our First User Meetup on Gratings

[January 18, 2021]
Due to the current situation, exhibitions and on-site events are unfortunately not possible. Nevertheless, we would like to create an opportunity for talking virtually with our optical engineers and sales representatives about current projects and developments. Therefore, we launched a new event format called User Meetup. To inaugurate this new format we have chosen the topic of gratings.
[January 18, 2021]

Register now and save your seat for our first User Meetup. To inaugurate this new format we have chosen the topic of gratings.

21 January | 09:00 – 20:00 (CET)

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Tight Focusing for Immersion Microscopy and STED Microscopy

[January 14, 2021]
We demonstrate that the asymmetric PSF is further elongated behind the coverslip. Moreover, STED (stimulated emission depletion) microscopy, which is widely used for tens-of-nanometer resolution, requires a donut-shaped PSF for depletion.
[January 14, 2021]

Tight focusing by high-NA objective lenses, which generates a small PSF (Point Spread Function), is essential for high-resolution microscopy systems. Among many other microscopy systems, immersion microscopy uses a coverslip to separate the immersion liquid and the specimen. It may distort the PSF at the focal plane. We demonstrate that the asymmetric PSF is further elongated behind the coverslip.  Moreover, STED (stimulated emission depletion) microscopy, which is widely used for tens-of-nanometer resolution, requires a donut-shaped PSF for depletion. We follow the proposed method by P. Török and P.R.T Monro to model the tight focusing of a Gaussian-Laguerre beam. The generation of a donut-shaped PSF is demonstrated.  

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Save your seat for our Webinars on Diffractive Lenses & Fiber Optics!

[January 12, 2021]
Register now for our upcoming webinars on Diffractive Lenses (13 January) and Fiber Optics (3 February)!
[January 12, 2021]

In order to adapt to different time zones worldwide, we will hold the webinars twice (all times CET):

Diffractive Lenses | 13 January | 10:00 & 18:00
Fiber Optics | 3 February | 10:00 & 18:00

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