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Optical pumping of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>5</mml:mn><mml:mi>s</mml:mi><mml:mn>4</mml:mn><mml:msup><mml:mi>d</mml:mi><mml:mn>1</mml:mn></mml:msup><mml:msub><mml:mi>D</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> strontium atoms for laser cooling and imaging

Optical pumping of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>5</mml:mn><mml:mi>s</mml:mi><mml:mn>4</mml:mn><mml:msup><mml:mi>d</mml:mi><mml:mn>1</mml:mn></mml:msup><mml:msub><mml:mi>D</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> strontium atoms for laser cooling and imaging

We present a faster repumping scheme for strontium magneto-optical traps operating on the broad $5{\mathrm{s}}^{2}{}^{1}{S}_{0}\ensuremath{-}{5s5p}^{1}{P}_{1}$ laser cooling transition. Contrary to existing repumping schemes, we directly address lost atoms that spontaneously decayed to the $5s4{d}^{1}{D}_{2}$ state, sending them back into the laser cooling cycle by optical pumping on the ${5s4d}^{1}{D}_{2}\ensuremath{-}{5s8p}^{1}{P}_{1}$ transition. …