45results about How to "High resistance to laser damage threshold" patented technology

The invention relates to a reflecting mirror with high reliability for a laser gyro prepared through ion beam sputtering. The reflecting mirror is prepared by the following steps of: alternately plating a regularTiO2 / SiO2 film high reflective coating with 1 / 4 working wavelength on a nano-grade quartz base by adopting a double-ion-beam sputtering and depositing process, plating a layer of extremely thin air interface layer material HfO2 at the outermost layer, and carrying out postprocessing under the condition of 340 DEG C / 6h on a reflecting mirror film in the air after the plating is finished. The reflecting mirror provided by the invention has extremely low loss and dispersion, a high laser damage resistant threshold, heat stability within 340 DEG C and favorable plasma discharging environment resisting capacity and can keep stable optical property of over 15000Sec in an environment with the plasma energy of 200w. The reflecting mirror prepared by using the technology provided by the invention has stable working property in a gyro resonator, has high environment reliability and can meet the application requirement of a high-precision laser gyro.

A light-induced stable nonlinear chalcogenide thin film and a preparation method thereof belong to optical thin films and nonlinear optical materials. The chemical composition of the film is Ge x As y S z Se 100‑x‑y‑z , wherein 10≤x≤14, 20≤y≤28, 16≤z≤50; its preparation adopts vacuum thermal evaporation method, and the vacuum degree is 10 ‑4 ~10 ‑6 torr, the evaporation rate is 3~20nm / min. The chalcogenide film prepared by the present invention has a refractive index of 2.20 to 2.56 at a wavelength of 1.55 μm, and the change of the film’s refractive index under thermal annealing and sub-band gap light is less than 10 ‑3 ; The optical band gap is 1.98~2.48ev; the loss of the film at 1.55μm wavelength is less than 0.2dB / cm; the third-order nonlinear refractive index at 1.55μm wavelength is 2.0~6.0x10 ‑14 cm 2 / W, no significant two-photon absorption; laser damage threshold greater than 200GW / cm 2 (5.3μm, 150fs, 1kHz). Advantages: 1. The light-induced refractive index change is extremely small, and the optical performance of the device is stable; 2. The anti-laser damage threshold of the film is high, which is conducive to the application of the device in the field of nonlinear optics; 3. The film composition and The refractive index is consistent with the bulk raw material used, and the consistency of film properties prepared in different batches is easy to control.