[1] Boyd R W 1992 Nonlinear Optics (San Diego: Academic) chap 1

[2] Belkin M A et al %, Kulakov T A, Yan K H, Ernst L and Shen Y R
2000 Phys. Rev. Lett. 85 4474

[3] Belkin M A et al %, Han S H, Wei X and Shen Y R
2001 Phys. Rev. Lett. 87 113001

[4] Fischer P et al %, Beckwitt K, Wise F W and Albrecht A C
2002 Chem.
Phys. Lett. 352 463

[5] Zawodny R et al %, Wozniak S and Wagni\`ere G
1996 Opt. Commun.
130 163

[6] Wozniak S 1997 Mol. Phys. 90 917

[7] Bass M et al %, Franken P A, Ward J F and Weinreich G
1962 Phys. Rev.
Lett. 9 446

[8] Yuh P F and Wang K L 1989 J. Appl. Phys. 65 4377

[9] Rosencher E and Bois Ph 1991 J. Phys. Rev. B 44 11315

[10] Kadlec F, Kuzel P and Coutaz J L 2004 Opt. Lett. 29
2674

[11] Il'inova T M et al %, Koroteev N I and Urakova N O
1996 Laser. Pyhs.
6 1018

[12] Fischer P and Albrecht A C 2002 Nonlinear and Quantum Optics
12 1177

[13] Wang X O, Li J Q and Li C F 2005 Chem. Phys. 320
37

[14] Nakaon H and Kimura H 1969 J. Phys. Soc. Jpn. 27 519

[15] Wang X O et al %, Li J Q and Li C F
2004 Chin. Phys.
Lett. 21 2433