We demonstrated programmable optical pulse shaping of femto-second laser pulse by using liquid crystal-spatial light modulator (LC-SLM). With a combination of amplitude and phase mask in LC-SLM, arbitrarily shaped ultra-short pulse waveforms could be synthesized by manipulating the frequency components which are spatially dispersed in the high-resolution zero-dispersion pulse shaping system. The specified shaped pulses, square root raised cosine (SRRC) and Meyer wavelet, are generated through the programmable pulse shaping system, which can potentially improve the performance of optical wireless communication system, for transmission through clouds.