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.
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 -1<sup>st</sup> 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.
Conference Committee Involvement (4)
Components and Packaging for Laser Systems IV
30 January 2018 | San Francisco, California, United States
Components and Packaging for Laser Systems III
31 January 2017 | San Francisco, California, United States
Components and Packaging for Laser Systems II
16 February 2016 | San Francisco, California, United States
Components and Packaging for Laser Systems
9 February 2015 | San Francisco, California, United States