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<para> We report on the setup and characterization of a 698-nm master&#x2013;slave diode laser system to probe the <formula formulatype="inline"><tex Notation="TeX">$^{1}\hbox{S}_{0} {-}^{3} \hbox{P}_{0}$</tex></formula> clock transition of strontium atoms confined in a 1-D optical lattice. A linewidth on the order of about 100 Hz of the laser system has been measured with respect to an ultrastable 657-nm diode laser with 1-Hz linewidth using a femtosecond fiber comb as a transfer oscillator. The laser has been used to measure the magnetically induced <formula formulatype="inline"> <tex Notation="TeX">$^{1}\hbox{S}_{0} {-}^{3} \hbox{P}_{0}$</tex></formula> clock transition in <formula formulatype="inline"><tex Notation="TeX"> $^{88}\hbox{Sr}$</tex></formula>, where a linewidth of 165 Hz has been observed. The transfer oscillator method provides a virtual beat signal between the two diode lasers that has been used to phase lock the 698-nm laser to the 1-Hz-linewidth laser at 657 nm, transferring its stability to the 698-nm laser system. </para>

Interrogation Laser for a Strontium Lattice Clock