Ytterbium-171 is a stable isotope of the element ytterbium, which has an atomic number of 70. It is one of the most abundant isotopes of ytterbium, making up about 70% of naturally occurring ytterbium. Ytterbium-171 has 103 neutrons and is used in various applications, including electronics and materials science. This isotope is particularly valuable in the field of nuclear medicine and as a dopant in fiber lasers. Its unique properties allow for efficient energy transfer and improved performance in laser technology. Ytterbium-171 is also studied for its potential use in quantum computing and other advanced technologies.