Low Absorption Chirped Mirrors with Reduced Thermal Lensing

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Controlling the heat accumulated in standard chirped mirrors due to absorption remains a problem. This heat creates a refractive index gradient, leading to thermal lensing — a distortion caused by uneven heating. As a result, the beam focus is altered and unwanted drifts occur. Moreover, absorption is the primary driver of coating degradation, which significantly lowers the lifetime of laser optics. OPTOMAN, through extensive R&D, developed low-absorption chirped mirrors to address these challenges. By reducing absorption by approximately a factor of 5, these mirrors minimize heat generation, hence ignoring the effects of thermal lensing. This innovation ensures stable beam focus and that no unwanted drifts occur.

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