Answer
The impact of Hänsch's Nobel-winning research on metrology lies in its significant contribution to precise and accurate measurements. Hänsch's advancements in laser spectroscopy techniques, particularly frequency comb technology, revolutionized the field of metrology. This innovation enabled extremely precise measurements of optical frequencies, leading to breakthroughs in the accuracy and stability of atomic clocks, optical communication systems, and various scientific and industrial applications that rely on precise measurements.