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Time‐resolved magneto‐optics is a well‐established optical pump–probe technique to generate and to probe spin coherence in semiconductors. By this method, spin dephasing times    T  2  *    can easily be determined if their values are comparable to the available pump–probe delays. If    T  2  *    exceeds the laser repetition time, however, resonant spin amplification (RSA) can equally be used to extract    T  2  *   . We demonstrate that in ZnO these techniques have several tripping hazards resulting in deceptive values for    T  2  *    and show how to avoid them. We show that the temperature dependence of the amplitude ratio of two separate spin species can easily be misinterpreted as a strongly temperature‐dependent    T  2  *    of a single spin ensemble, while the two spin species have    T  2  *    values, which are nearly independent of temperature. Additionally, consecutive pump pulses can significantly diminish the spin polarization, which remains from previous pump pulses. While this barely affects    T  2  *    values extracted from delay line scans, it results in seemingly shorter    T  2  *    values in RSA.

Unambiguous determination of spin dephasing times in ZnO by time‐resolved magneto‐optical pump–probe experiments