Method of and apparatus for modulating a laser beam

Details Method of and apparatus for modulating a laser beam Method of and apparatus for modulating a laser beam

1989-05-26

1990-06-05

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Modulation

372 69, 372 10, 372 25, H01S 310

Patent

active

049309013

ABSTRACT:
A laser system operable in both a lead bonding mode and a lead severing mode. When in the lead bonding mode, the light-amplifying medium (38) of the laser is optically pumped by a lamp (45) to produce laser pulses within the laser cavity (36). The power supply (56) is rapidly switched to provide the bonding pulses (L.sub.b) at a high repetition rate. A Q-switch (46) is disposed within the cavity (36) to shape the laser output pulses (L.sub.b) with a leading power spike (S.sub.b) that is suitable for reducing the reflectivity of the lead (20) surface, thereby facilitating maximum absorption of the laser energy for the bonding operation. When in the severing mode, the light-amplifying medium (38) is continuously pumped and the Q-switch (46) is repetitively switched at a rate high enough to generate laser pulses (L.sub.s) suitable for severing the leads (20) without heating adjacent portions of the leads (20).

REFERENCES:
patent: 4276497 (1981-06-01), Burbeck et al.
patent: 4337442 (1982-06-01), Mauck
patent: 4439861 (1984-03-01), Bradford
patent: 4510606 (1985-04-01), Yagi et al.
patent: 4539685 (1985-09-01), Hart et al.
patent: 4630275 (1986-12-01), Rapoport
patent: 4675872 (1987-06-01), Popek et al.
patent: 4737958 (1988-04-01), Sizer, II
patent: 4761786 (1988-08-01), Baer

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