Idealphotonics' frequency-locked lasers are laser systems that lock the output frequency to a specific reference (such as atomic transitions or optical cavity resonances) using active or passive techniques. Their primary goal is to achieve ultra-narrow linewidths (down to the Hz level) and extremely low frequency drift (<1 MHz/hour), meeting the stringent frequency stability requirements of high-precision applications such as precision metrology and quantum technologies.The core competitiveness of frequency-locked lasers lies in pushing the uncertainty of laser frequency to the physical limit. Their key features can be summarized as: Hz-level ultra-narrow linewidth (ultimate monochromaticity); 10⁻¹³-level frequency stability (optical ruler); traceability to natural standards (international standard compatibility); and low-noise, clean output (essential for quantum experiments).