激光技术
激光技術
격광기술
LASER TECHNOLOGY
2013年
5期
668-671
,共4页
光学设计%非线性光学效应%阈值测量%焦点定位
光學設計%非線性光學效應%閾值測量%焦點定位
광학설계%비선성광학효응%역치측량%초점정위
optical design%nonlinear optical effect%damage threshold measurement%focus location
为了抑制非线性光学效应对光学材料表面损伤阈值测量的影响，设计了一种新的激光焦点对焦方法，利用激光对空气电离所发射的等离子体光线作为参照物进行焦点定位，对焦过程中，激光电离焦点处的空气形成等离子体亮点，该亮点通过光学材料表面形成镜像，由镜面成像原理可知样品表面位于等离子体亮点和其镜像连线的中点，调节亮点和镜像重合即可完成对焦。结果表明，该方法操作简便、精度高，这对光学材料的表面损伤阈值测量具有重要意义。
為瞭抑製非線性光學效應對光學材料錶麵損傷閾值測量的影響，設計瞭一種新的激光焦點對焦方法，利用激光對空氣電離所髮射的等離子體光線作為參照物進行焦點定位，對焦過程中，激光電離焦點處的空氣形成等離子體亮點，該亮點通過光學材料錶麵形成鏡像，由鏡麵成像原理可知樣品錶麵位于等離子體亮點和其鏡像連線的中點，調節亮點和鏡像重閤即可完成對焦。結果錶明，該方法操作簡便、精度高，這對光學材料的錶麵損傷閾值測量具有重要意義。
위료억제비선성광학효응대광학재료표면손상역치측량적영향，설계료일충신적격광초점대초방법，이용격광대공기전리소발사적등리자체광선작위삼조물진행초점정위，대초과정중，격광전리초점처적공기형성등리자체량점，해량점통과광학재료표면형성경상，유경면성상원리가지양품표면위우등리자체량점화기경상련선적중점，조절량점화경상중합즉가완성대초。결과표명，해방법조작간편、정도고，저대광학재료적표면손상역치측량구유중요의의。
A new laser focusing method was proposed to reduce the nonlinear optical effect for the measurement of damage threshold on optical material surfaces .The focus is located by utilizing the plasma beam as the reference object which is emitted by the air ionization .In the focusing process , an image is formed by a plasma luminous point which is formed by the air ionization.Based on the mirror image principle , the sample surface is in the middle of the luminous point and the image, the focusing process is completed when the luminous point and the image coincide .In conclusion, the method is simple operation and high precision , it is important to the measurement of damage threshold on optical material surfaces .
