双光栅夹有机溶液构成的宽带光限幅器

提出一种新光限幅器件并给出初步的实验验证。该器件是将非线笥有机溶液夹在两块不同的浮周型透射光栅之间构成的。

Broadband Optical Limiter with an Organic Solution Sandwiched Between Two Gratings

A novel optical limiting device is proposed. The device consists of an organic solution sandwiched between two transmitted relief gratings with different grove sturcture. The refraction index of the liquid is matched with that of grating material. The device has a high transmittance under the common light. However, the strong laser will make the liquid to thermally vaporize, index mismatch, and two gratings appear. The incident light will be total reflected and scattered by the front grating, then it will be strongly absorbed, scattered and self focused by the organic solution. Finally, the rear grating will suppress the zero order diffraction, let the transmitted light energy lower than the damage threshold of human eyes. Therefore, the device provides an effective protection of eyes against the broadband pulsed laser damage.