Apparatus for processing work-piece
An apparatus for processing a work-piece ( 80 ) includes a laser source ( 102 ) and a first lens assembly ( 108 ). The laser source is configured for emitting laser beams. The first lens assembly is configured for adjustably focusing the laser beams onto the work-piece. The first lens assembly is disposed in optical alignment with the laser source and includes a first lens set having a positive refractive power and a second lens set having a negative refractive power. Because of the first lens assembly, the laser beams emitted from the laser source can be focused accurately onto the work-piece, and then the apparatus for processing the work-piece has accurately focused laser beams as a result.
1. An apparatus for processing a work-piece, comprising:
a laser source configured for emitting laser beams,
a lens module configured for adjustably focusing the laser beams onto the work-piece, the lens module comprising a first lens assembly disposed in optical alignment with the laser source, the first lens assembly comprising a first lens set having a positive refractive power and a second lens set having a negative refractive power, wherein a distance between the first lens set of the first lens assembly and the second lens set of the first lens assembly satisfies the following equation:
d 12 =( k 1 +k 2 −k 12 )/( k 1 ×k 2 )
wherein k 1 represents an index of refraction of the first lens set, k 2 represents an index of refraction of the second lens set, k 12 represents an index of refraction of the first lens assembly, and
an effective focal length f 1 of the first lens assembly satisfies the following equation:
f 1 =1 /k 12
and a back focal length f 2 of the first lens assembly satisfies the following equation:
f 2 =(1− d 12 ×k 1)/ k 12 =f 1 ×(1 −d 12 ×k 1 ), and
a feedback module configured for receiving the laser beams reflected from the work-piece and generating a feedback signal based on the reflected laser beams.
2. The apparatus as claimed in claim 1 , further comprising a laser-controlling module configured for adjustably controlling operational parameters of the laser source based on the feedback signal.
3. The apparatus as claimed in claim 1 , wherein the laser source module comprises a laser source for emitting laser beams and a shutter configured for regulating an intensity of the laser beams.
4. The apparatus as claimed in claim 1 , wherein the laser source is selected from the group consisting of gas lasers, excimer lasers and solid-state lasers.
5. The apparatus as claimed in claim 4 , wherein the laser source is a solid-state laser, which is selected from the group consisting of Nd-YAG lasers, Yb-YAG lasers and Nd-Vanadate lasers.
6. The apparatus as claimed in claim 1 , further comprising a laser-cooling device configured for cooling the laser source.
7. The apparatus as claimed in claim 1 , wherein the feedback module comprises an optical detector, a second lens assembly configured for projecting the laser beams reflected from the work-piece onto the optical detector, and a processing unit, the optical detector being configured for generating an electrical signal and transmitting the electrical signal to the processing unit, the processing unit being configured for generating the feedback signal based on the electrical signal.
8. The apparatus as claimed in claim 1 , further comprising a worktable configured for supporting the work-piece thereon, the worktable being moveable horizontally and vertically.
9. The apparatus as claimed in claim 1 , wherein the worktable further comprises a work-piece cooler configured for cooling the work-piece.
10. The apparatus as claimed in claim 9 , wherein the work-piece cooler is a thermal electric cooler.