Laser processing of conductive links
View Patent ↗A laser system for processing conductive link structures includes a seed laser generating a seed laser beam. The seed laser is sliced by a modulator into a user configurable series of pulses and the pulses are optically amplified and applied to a conductive link structure. Preferably, the bandwidth of the seed laser is less than 1 nm with an IR center frequency, and the frequency of the laser light of the pulses is doubled or quadrupled prior to application to the conductive structure. Preferably, the pulses are about 1-18 second pulsewidth and are separated by 100-400 ns.
1. A method of laser-based material processing comprising:
generating a laser beam having a narrow emission spectrum characterized by a full width at half maximum intensity of less than about 1 nanometer during a first time interval;
controllably modifying a characteristic of the laser beam during the time interval to produce one or more pulses without substantially broadening the emission spectrum; and
delivering and focusing at least one of the one or more pulses onto at least one target structure during motion of the at least one structure relative to the at least one pulse.
2. The method of claim 1 , wherein said generating comprises driving a laser diode in a substantially continuous manner.
3. The method of claim 2 , wherein controllably modifying comprises slicing the laser beam into one or more pulses.
4. The method of claim 3 , wherein controllably modifying additionally comprises shifting a center wavelength of the one or more pulses.
5. The method of claim 4 , wherein said shifting comprises frequency doubling, tripling, or quadrupling.
6. The method of claim 1 wherein the first time interval is greater than about 100 nanoseconds.
7. The method of claim 1 wherein the first time interval is greater than about 500 nanoseconds.
8. The method of claim 1 , wherein said laser beam comprises a plurality of laser pulses, each characterized by a narrow emission spectrum having a full width at half maximum intensity of less than about 1 nanometer and a different center wavelength.
9. The method of claim 8 , wherein said controllably modifying comprises selecting one or more pulses having a desired center wavelength.
10. The method of claim 9 , wherein controllably modifying additionally comprises shifting a center wavelength of the one or more pulses.
11. The method of claim 1 , wherein said one or more pulses are characterized by an emission spectrum with a full width at half maximum intensity of less than about 0.25 nanometers.
12. The method of claim 1 , wherein said one or more pulses are characterized by an emission spectrum with a full width at half maximum intensity of less than about 0.1 nanometers.
13. A method of severing conductive target structures on and/or embedded in one or more dielectric and/or semiconductor materials, the method comprising:
generating a substantially continuous narrowband laser beam characterized by a full width at half maximum intensity of less than about 1 nanometer;
modulating the substantially continuous narrowband laser beam to produce one or more narrowband laser pulses;
amplifying the narrowband laser pulses;
shifting the center wavelength of the narrowband laser pulses; and
applying the amplified and shifted laser pulses to one or more conductive target structures.
14. The method of claim 13 , wherein said substantially continuous narrowband laser beam is characterized by an on-time of at least 100 nanoseconds.
15. The method of claim 13 , wherein said substantially continuous narrowband laser beam is characterized by an on-time of at least 500 nanoseconds.