| Writing of internal gratings in optical glass with a femtosecond laser |
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| 作者姓名： | 程光华 刘青 王屹山 于连军 赵卫 陈国夫 |
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| 作者单位： | State Key Laboratory of Transient Optics and Technology，Xi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068，State Key Laboratory of Transient Optics and Technology，Xi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068，State Key Laboratory of Transient Optics and Technology，Xi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068，State Key Laboratory of Transient Optics and Technology，Xi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068，State Key Laboratory of Transient Optics and Technology，Xi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068，State Key Laboratory of Transient Optics and Technology，Xi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China under Grant No:60078004 and the Director Foundation of State Key Laboratory of Transient Optics and Technology. |
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| 摘 要： | The writing of an internal diffraction grating in optical glass plate is demonstrated using low-density plasma formation excited by a high-intensity femtosecond Ti:sapphire laser. The same diffraction efficiency at ±1,±2, and 0 order is achieved by multiple layers writing. The dependences of diffractive efficiency on the irradiated energy, the speed of writing, the numerical aperture (NA) of the focusing objective, and materials are investigated in detail. The grating is birefringent. It is attributed to residual stress interaction between glass and femtosecond laser pulse.
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