An all-silica Fabry-Pérot interferometer (FPI) is demonstrated for high-temperature pressure monitoring. The pressure sensor is fabricated with single mode fiber and silica capillary by CO2 laser. Owing to slight mismatch of thermal expansion coefficient in all-silica structure. it can work stably under 600°C atmosphere. https://fitnessgravesyardes.shop/product-category/resistance-brake/