Method and system for forming periodic pulse patterns
A system for forming a periodic pulse pattern in a sample includes a movable stage having the sample loaded thereon, a pulse laser for generating a laser beam of pulses, an objective lens for focusing the laser beam to the sample to form a pattern of pulses in the sample, and a controller for adjusting the movement speed of the movable stage to set a period of the pulse pattern. The pulse pattern includes a spot pattern or a line pattern made by a slit provided between the pulse laser and the objective lens.
1 . A system for forming a periodic pulse pattern in a sample, comprising:
a movable stage having the sample loaded thereon;
a pulse laser for generating a laser beam of pulses;
means for focusing the laser beam to the sample to form a pattern of pulses in the sample; and
a controller for adjusting the movement speed of the movable stage to set a period of the pulse pattern.
2 . The system of claim 1 , wherein the pulse pattern includes a spot pattern.
3 . The system of claim 1 , wherein the pulse pattern includes a line pattern.
4 . The system of claim 2 , wherein said focusing means includes:
an objective lens for focusing the pulse laser beam in a form of a circular spot to the sample, to thereby form the spot pattern in the sample.
5 . The system of claim 3 , wherein said focusing means includes:
a slit for transforming the pulse laser beam into a form of a slit beam; and
an objective lens for focusing the slit beam in a form a line to the sample, to thereby form the line pattern formed in the sample.
6 . The system of claim 1 , wherein the sample is selected from a group including a silica, glass, metal, polymer and LithiumNiobate (LiNbO 3 ).
7 . The system of claim 1 , wherein the pulse laser includes an ultrahigh speed femtosecond laser.
8 . The system of claim 4 , wherein a size and a depth of the circular beam are set by adjusting a magnification and numerical aperture of the subject lens and adjusting power density of the pulse laser.
9 . The system of claim 5 , wherein a size and a depth of the slit beam are set by adjusting a magnification and numerical aperture of the beam focusing lens and adjusting power density of the pulse laser.
10 . The system of claim 1 , wherein the periodic pattern is formed on a surface of or inside the sample depending on a focal depth.
11 . A method for forming a periodic pulse pattern in a sample, comprising the steps of:
loading the sample on a movable stage;
generating a laser beam of pulses from a pulse laser;
focusing the laser beam to the sample using a beam focusing lens; and
adjusting the movement speed of the movable stage so that the laser beam is scanned in the sample, to thereby form the periodic pulse pattern in the sample.
12 . The method of claim 11 , wherein the pulse pattern includes a spot pattern.
13 . The method of claim 11 , wherein the pulse pattern includes a line pattern.
14 . The method of claim 12 , wherein a size and a depth of the spot pattern are set through adjusting a magnification and numerical aperture of the beam focusing lens and adjusting power density of the pulse laser.
15 . The method of claim 13 , wherein a size and a depth of the slit pattern are set through adjusting a magnification and numerical aperture of the beam focusing lens and adjusting power density of the pulse laser.
16 . The method of claim 11 , wherein the periodic pattern is formed on a surface of or inside the sample depending on a focal depth.