4.6-W Single Frequency Semiconductor Disk Laser With <formula formulatype="inline"> <tex Notation="TeX">${&lt;}{\rm 75}\hbox{-}{\rm kHz}$</tex></formula> Linewidth


We report on a single frequency semiconductor disk laser producing 4.6 W of output power with the free-running linewidth of &lt;;75 kHz derived from delayed self-heterodyne measurements. The implementation of the flip-chip gain design allows for considerable power scaling with good beam quality and high spectral purity. 


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