Laser with integrated multi line or scanning beam capability
A method and system for providing illumination is disclosed. The method may include providing a laser having a predetermined wavelength; performing at least one of: beam splitting or beam scanning prior to a frequency conversion; converting a frequency of each output beam of the at least one of: beam splitting or beam scanning; and providing the frequency converted output beam for illumination.
1. An illumination apparatus, comprising:
a laser source, the laser source configured for providing a laser having a predetermined DUV wavelength and a power up to 500 mW;
a beam scanner, the beam scanner configured for directly receiving the laser from the laser source and scanning the laser from the laser source utilizing a polygon scanner or a resonant scanner to provide a plurality of parallel beams; and
a frequency converter, the frequency converter configured for receiving the plurality of parallel beams, converting the frequency of each of the plurality of parallel beams such that each of the plurality of converted parallel beams has a second predetermined wavelength, and providing the plurality of converted parallel beams as output,
wherein the plurality of parallel beams are distributed across a plurality of spots on the frequency converter during operations of the illumination apparatus to reduce time-averaged fluences at the plurality of spots on the frequency converter.
2. The illumination apparatus of claim 1 , wherein the frequency converter includes at least one frequency converting crystal.
3. The illumination apparatus of claim 2 , wherein the at least one frequency converting crystal is a harmonic generation crystal.
4. The illumination apparatus of claim 1 , wherein the frequency converter is a single frequency converting crystal.
5. The illumination apparatus of claim 1 , wherein the frequency converter is configured for receiving the plurality of parallel beams directly from the beam scanner.
6. The illumination apparatus of claim 1 , wherein the second predetermined wavelength is within a range of Deep Ultraviolet (DUV).
7. The illumination apparatus of claim 1 , further comprising:
a shifting mechanism, the shifting mechanism configured for shifting position of the frequency converter relative to the plurality of parallel beams over time.
8. The illumination apparatus of claim 1 , further comprising:
a second scanner, the second scanner positioned at the output of the frequency converter, the second scanner configured for providing de-scanning after frequency conversion of the plurality of parallel beams to combine the output of the frequency converter.
9. An illumination apparatus, comprising:
a laser source, the laser source configured for providing a laser having a predetermined DUV wavelength and a power up to 500 mW;
a frequency converter; and
a beam scanner, the beam scanner positioned in the optical path between the laser source and the frequency converter, the beam scanner configured for scanning the laser from the laser source utilizing a polygon scanner or a resonant scanner and providing a plurality of parallel beams prior to frequency conversion.
10. The illumination apparatus of claim 9 , wherein the scanner is a single-line scanner.
11. The illumination apparatus of claim 9 , wherein the scanner is a multi-line scanner.
12. The illumination apparatus of claim 9 , wherein the frequency converter includes a single frequency converting crystal.
13. The illumination apparatus of claim 12 , further comprising:
a shifting mechanism, the shifting mechanism configured for shifting position of the frequency converting crystal relative to optical output of the scanner over time.
14. The illumination apparatus of claim 9 , wherein the illumination apparatus is configured for providing illumination for a wafer inspection system.
15. The illumination apparatus of claim 14 , wherein the frequency converter is configured for providing at least one frequency converted beam having a wavelength within a range of Deep Ultraviolet (DUV).
16. The illumination apparatus of claim 1 , wherein the plurality of parallel beams is formed into at least one of: a one-dimensional array of parallel beams or a two-dimensional matrix of parallel beams.
17. The illumination apparatus of claim 9 , further comprising:
a second scanner, the second scanner positioned at the output of the frequency converter, the second scanner configured for providing de-scanning after frequency conversion to combine the output of the frequency converter.
18. A method for providing illumination, comprising:
providing a laser having a predetermined DUV wavelength and a power up to 500 mW;
scanning a beam from the laser utilizing a polygon scanner or a resonant scanner into at least one of a one-dimensional array of parallel beams or a two-dimensional matrix of parallel beams so as to distribute two or more portions of the laser beam across a plurality of spots on a frequency converter prior to performing frequency conversion with the frequency converter to reduce time-averaged fluences at the plurality of spots on the frequency converter;
performing frequency conversion, with the frequency converter, directly on the laser beam following scanning to form a frequency converted output beam; and
providing the frequency converted output beam for illumination.
19. The method of claim 18 , further comprising:
shifting position of the frequency converter relative to at least one of the one-dimensional array of parallel beams or the two-dimensional matrix of parallel beams.
20. The illumination apparatus of claim 9 , wherein the plurality of parallel beams is formed into at least one of: a one-dimensional array of parallel beams or a two-dimensional matrix of parallel beams.