SBIR Phase I: Real Time Spectrogram Inversion for UltrashortLaser Pulse Measurement

小型企业创新研究第一阶段项目将开发一种用于超短激光脉冲测量的光谱图实时反演算法。超快激光系统在生物化学、化学、物理和电气工程等领域有着广泛的应用。这些系统产生持续时间为10皮秒或更短的激光脉冲，这些系统用于探索蛋白质中的动力学，检查半导体中的载流子松弛，或通过混浊介质成像。通过使用超快速诊断系统，高度先进的半导体，电子电路，甚至生物医学产品都可以开发和测试用于商业应用。此外，在强度和相位上都需要形状超短脉冲的新应用，如化学反应的相干控制，也开始得到发展。这些应用的持续发展将需要快速、高质量和易于使用的超快激光脉冲诊断。频率分辨光门控（FROG）是一种可靠有效的超短激光脉冲诊断方法，但需要迭代算法来获取超短脉冲的特性（强度和相位）。目前的反演算法速度很慢。在第一阶段的研究工作中，将开发一种新的反演算法，该算法将从FROG设备的实时输出中获得超短脉冲的强度和相位，从而促进超短激光脉冲实时示波器的开发。直接的商业应用是直接用于诊断现有的超快激光系统，目前很少有可用的。该算法的其他商业应用包括扫描透射电子显微镜。＊＊＊

*** ABSTRACT 96-61596 Kane This Small Business Innovation Research Phase I project will develop an algorithm for the real-time inversion of spectrograms for ultrashort laser pulse measurement. Ultrafast laser systems have a large number of applications in biochemistry, chemistry, physics, and electrical engineering. These systems generate laser pulses with durations of 10 picoseconds or less and such systems are used to explore kinetics in proteins, examine carrier relaxation in semiconductors, or image through turbid media. By using ultrafast diagnostic systems, highly advanced semiconductors, electronic circuitry, and even biomedical products can be developed and tested for commercial applications. Furthermore, new applications requiring shaped ultrashort pulses in both intensity and phase-such as coherent control of chemical reactions are beginning to be developed. The continued development of these applications will require, fast, high quality, and easy-to-use ultrafast laser pulse diagnostics. Frequency-resolved optical gating (FROG) has been proven to be a reliable and effective ultrashort laser pulse diagnostic, but requires an iterative algorithm to obtain the ultrashort pulse's characteristics (intensity and phase). Current inversion algorithms are slow. During the Phase I research effort, a new inversion algorithm will be developed that will obtain the intensity and phase of an ultrashort pulse from the FROG device's output in real time facilitating the development of a real-time oscilloscope for ultrashort laser pulses. Immediate commercial applications are directed toward use as a diagnostic for existing ultrafast laser systems for which few are currently available. Other commercial applications for the algorithm include scanning transmission electron microscopy. ***