**
PROGRAM SUMMARY
**
**
Title of program:
**
propBG
**
Catalogue identifier:
**
ADLO
**
Ref. in CPC:
**
126(2000)269
**
Distribution format: ** tar gzip file
**
Operating system: ** UNIX (AIX3.2.5, SunOS 5.6, OSF1 4.0D, IRIX 6.4)
**
High speed store required:
**
2MK words
**
Number of lines in distributed program, including test data, etc:
**
8876
**
Programming language used: ** Fortran

**
Nature of physical problem:
**

The program calculates conversion efficiencies and spatio-temporal
far-field profiles of harmonics generated by a gaseous target irradiated
by an intense Gaussian or Bessel-Gauss beam, given the relevant atomic
data.

**
Method of solution
**

The harmonic far-field amplitude is expressed as an integral over the
medium, with the help of the retarded Green's function of the
propagation equation, and is evaluated by numerical quadrature.

**
Unusual features of the program
**

The optional use of the routine S17DEF of the NAG Fortran Library [1].

**
Typical running time
**

Depends crucially on the complexity of the problem. About 18 minutes
for the test data on a SGI Origin 2000 machine (R10000 processor running
at 195 MHz).

**
References
**

[1] NAG Fortran Library Manual, Mark 13 (The Numerical Algorithms Group Ltd, Oxford, 1988).