Optical: systems and elements – Optical amplifier – Raman or brillouin process
Patent
1994-09-26
1995-12-12
Hellner, Mark
Optical: systems and elements
Optical amplifier
Raman or brillouin process
372 3, H01S 310
Patent
active
054755271
ABSTRACT:
A solid state laser is frequency tripled to 0.3 .mu.m. A small portion of the laser is split off and generates a Stokes seed in a low power oscillator. The low power output passes through a mask with the appropriate hole pattern. Meanwhile, the bulk of the laser output is focused into a larger stimulated Brillouin scattering (SBS) amplifier. The low power beam is directed through the same cell in the opposite direction. The majority of the amplification takes place at the focus which is the fourier transform plane of the mask image. The small holes occupy large area at the focus and thus are preferentially amplified. The amplified output is now imaged onto the multichip module where the holes are drilled. Because of the fourier plane amplifier, only .about.1/10th the power of a competitive system is needed. This concept allows less expensive masks to be used in the process and requires much less laser power.
REFERENCES:
patent: 5260954 (1993-11-01), Dane et al.
patent: 5394412 (1995-02-01), Huignard et al.
Dane C. Brent
Hackel Lloyd A.
Hermann Mark R.
Tiszauer Detlev H.
Hellner Mark
Sartorio Henry P.
The Regents of the University of California
Wooldridge John P.
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