Optical　element　of　micro　grating　is　usually　made　using　expensive　ultraviolet　laser　or　ultrafast　laser.　In　order　to　reduce　the　cost　a　532nm　green　laser　with　long　pulse　width　1ms　was　used　to　etch　K9　glass　of　5mm　thickness　directly.　This　laser　is　inexpensive　and　easily　maintained　comparing　with　femtosecond　laser　and　excimer　laser.　It　was　successfully　applied　for　the　fabrication　of　single　trench　and　two-dimensional　periodic　micro-structure　on　K9　glass.　We　achieved　the　smooth　single　trench　with　the　width　of　22　pm　and　depth　of　2.2　μm　with　this　laser.　The　roughness　of　the　trench　bottom　is　below　40nm　according　to　the　measurement　of　3D　profiler.　The　crisscross　2D　periodic　micro-structured　was　etched　with　the　laser　fluence　3.5　J/cm2.　The　depth　is　about　1.1　μm　and　the　width　at　the　surface　of　the　glass　is　approximately　15μm.　There　is　no　micro　crack　found　on　the　surface　of　glass　with　optical　microscope.　In　addition　the　diffraction　patterns　were　observed,　which　proved　the　optics　element　works　well.　Copyright　©　2013　MS&T＇13®.