Abstract

A simplified multiwavelength prototype of an axially symmetric diode laser device based on stacks made of single emitters has been made, and the performance of the device has been demonstrated experimentally. The results verify that kilowatt-level light power can be focused into a circular spot with a $1/e^2$ diameter of $360\text{\hspace{0.17em} μm}$, a focal length of $100\text{\hspace{0.17em} mm}$, and a numerical aperture of 0.24, thus producing an average power density in excess of $10\text{kW}/{\text{mm}}^{\text{2}}$ and a brightness of $6\times {10}^{10}{\text{W m}}^{-2}{\text{sr}}^{-1}$. The experiments also predict that it will be possible to increase these values to more than $60\text{kW}/{\text{mm}}^{\text{2}}$ and $3\times {10}^{11}{\text{W m}}^{-2}{\text{sr}}^{-1}$.

© 2006 Optical Society of America

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