To describe the laser drilling process, a theoretical model that includes expulsion of liquid material is developed. The model allows the calculation of drilling velocity and drilling efficiency as a function of the absorbed intensity. The same quantities were determined experimentally, using Nd‐YAG‐laser pulses of rectangular shape. Good agreement between measurement and calculation was found in the intensity region where efficient drilling is possible, i.e., where reflection losses and vapor absorption can be neglected. For most metals this region is between 1 and 100 MW/cm2.

1.
A. M.
Bonch‐Bruevich
,
Ya. A.
Imas
,
G. S.
Romanov
,
M. N.
Libenson
, and
L. N.
Mal’tsev
,
Sov. Phys.‐Tech. Phys.
13
,
640
(
1968
).
2.
M. von Allmen, Dissertation (University of Berne, 1975) (unpublished).
3.
F. W.
Dabby
and
U.‐C.
Paek
,
IEEE J. Quantum Electron.
QE‐8
,
106
(
1972
).
4.
S. I. Anisimov, Ya. A. Imas, G. S. Romanov, and Yu. V. Khodyko, Nat. Tech. Info. Serv. JPRS‐53241, 1971 (unpublished).
5.
H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids (Oxford University Press, New York, 1959).
6.
L. D. Landau and E. M. Lifshitz, Statistical Physics (Pergamon, New York, 1959).
7.
V. A.
Batanov
,
F. V.
Bunkin
,
A. M.
Prokhorov
, and
V. B.
Fedorov
,
Sov. Phys.‐JETP
36
,
311
(
1973
).
8.
J.
Steffen
,
H. P.
Lörtscher
, and
G.
Herziger
,
IEEE J. Quantum Electron.
QE‐8
,
239
(
1972
).
This content is only available via PDF.
You do not currently have access to this content.