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Farum, Denmark

Rasmussen T.P.,Ibsen Photonics
Applied Spectroscopy | Year: 2016

In this article we outline how ultra-compact, yet high performance spectrometers can be designed and built with highly dispersive transmission gratings. By using fused silica as the grating material, and by careful design of the detailed grating structure, we demonstrate an ultraviolet spectrometer with a high and nearly flat efficiency from 178 to 409 nm, a resolution of 0.2 nm, and dimensions of only 61 mm × 64 mm × 19 mm. We tested this spectrometer in a laser-induced breakdown spectroscopy experiment and showed that the spectral information gathered with the spectrometer can be used to obtain quantitative results for sulfur. © Society for Applied Spectroscopy. Source


Tarasov A.A.,Laseroptek Ltd. | Chu H.,Laseroptek Ltd. | Buchwald K.,Ibsen Photonics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Two years ago we reported about the development of solid state laser source for medical skin treatment with wavelength 310.6 nm and average power 200 mW. Here we describe the results of investigation of the advanced version of the laser, which is a more compact device with increased output power and flat top beam profile. Ti: Sapphire laser, the main module of our source, was modified and optimized such, that UV average power of the device was increased 1.7 times. Fiber optic homogenizer was replaced by articulated arm with diffraction diffuser, providing round spot with flat profile at the skin. We investigated and compare characteristics of Ti: Sapphire lasers with volume Bragg grating and with fused silica transmission grating, which was used first time for Ti: Sapphire laser spectral selection and tuning. Promising performance of last gratings is demonstrated. © 2015 SPIE. Source


Andkjaer J.,Ibsen Photonics | Ryder C.P.,Ibsen Photonics | Nielsen P.C.,Ibsen Photonics | Rasmussen T.,Ibsen Photonics | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

We propose a design methodology for systematic design of surface relief transmission gratings with optimized diffraction efficiency. The methodology is based on a gradient-based topology optimization formulation along with 2D frequency domain finite element simulations for TE and TM polarized plane waves. The goal of the optimization is to find a grating design that maximizes diffraction efficiency for the -1st transmission order when illuminated by unpolarized plane waves. Results indicate that a surface relief transmission grating can be designed with a diffraction efficiency of more than 40% in a broadband range going from the ultraviolet region, through the visible region and into the near-infrared region. © 2014 SPIE. Source

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