Dispersive Mirror Data

We report an ultra wideband, high reflectivity backside coated low dispersion mirror (BASIC LDM) with a working wavelength range of 700-1050 nm. BASIC LDM consists of three main parts: front anti reflective coating, 1mm quartz substrate, and back coated dispersion compensating mirror. The light initially passes through the anti reflection coating and quartz substrate, and then reflects inside the dispersion compensating mirror. The substrate generates positive dispersion, while the dispersion compensating mirror provides equivalent negative dispersion, thereby achieving zero group delay dispersion (GDD) over an ultra wide bandwidth. In a 16.4 fs ultrafast laser system, the laser-induced damage threshold of BASIC LDM was measured to be 0.11 J/cm2. The application performance of BASIC LDM was evaluated, and a 13.6fs pulse was reflected four times to generate a 13.3fs output pulse. This study introduces a new design method for low dispersion mirrors with wider operating bandwidth and lays the foundation for advancing ultrafast laser systems with wider spectral ranges.