عنوان مقاله [English]
In this paper sound generation by laser pulse irradiated on a solid block is investigated. After an introduction to known mechanisms and main equation of laser acoustics, the laser pulse profile of NdYAG laser by straight radiation on a photo-resistor was recorded and the profile was substituted as an optoacoustic source in related equation of sound evolution. Finally the solution of numerically solved equation and measured generated sound were compared. Results show that there exists direct relationship between generated sound pulse width and laser pulse width. Furthermore there exists reverse relationship between generated sound pulse width and solid block thickness. In addition, results of simulation and experimental data measured by laser microphone with photo-resistor detector are compared by obtained sound spectrum from Spectrogram which confirm previous theoretical and experimental data. Finally general rule of the similarity of sound pulse profile and sound generator laser pulse profile are observed in this experiment.
 Patel CKN , Tam AC. Pulsed optoacoustic spectroscopy of condensed matter. Review of modern physics.1981; 53:517.
 Akhmanov SA, Gusev VE, Karabutov AA. Pulsed laser optoacoustics: Achievements and perspective. Infrared Physics. 1989 May 1;29(2-4):815-38.
 Akhmanov SA, Gusev VE. Laser excitation of ultrashort acoustic pulses: New possibilities in solid-state spectroscopy, diagnostics of fast processes and nonlinear acoustics. Physics-Uspekhi. 1992;35(3):153-91.
 Gauster WB, Habing DH. Physical review letters. 1967 Jun 12;18(24)1058.
 Pidgeon CR, Wherrett BS, Johnston AM, Dempsey J, Miller A. Two-photon absorption in zinc-blende semiconductors. Physical Review Letters. 1979 Jun 25;42(26):1785.
 Thomsen C, Strait J, Vardeny Z, Mavis HJ, Tanc J, Hauser JJ. Coherent phonon generation and detection by picosecond light pulses. Physical review letters. 1984 Sep 3;53(10):989.
 Tom HW, Aumiller GD, Brito-Cruz CH. Time resolved study of laser-induced disorder of Si surfaces. Physical review letters. 1988 Apr 4;60(14):1438.
 Murnane MM, Kapteyn HC, Falcone RW. High-density plasmas produced by ultrafast laser pulses. Physical review letters. 1989 Jan 9;62(2):155.
 Ko SH, Ryu SG, Misra N, Pan H, Grigoropoulos CP, Kladias N, et al. Laser induced short plane acoustic wave focusing in water. Applied physics letters. 2007 Jul 30;91(5):051128.
 Ko SH, Ryu SG, Misra N, Pan H, Grigoropoulos CP, Kladias N, Panides E, Domoto GA. Laser induced plane acoustic wave generation, propagation, and interaction with rigid structures in water. Journal of Applied Physics. 2008 Oct 1;104(7):073104.
 L’Etang A, Huang Z. FE simulation of laser generated surface acoustic wave propagation in skin. Ultrasonics. 2006 Dec 22;44:e1243-7.
12] He H, Feng S. Ultrashort pulse laser used to generate sound under water. Technical Digest. CLEO/Pacific Rim'99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No. 99TH8464) ;1999; Seoul, South Korea. IEEE .Vol. 2. p. 336-337.