论文标题
与微型半导体激光器的皮秒超声波
Picosecond Ultrasonics with Miniaturized Semiconductor Lasers
论文作者
论文摘要
人们渴望将超声技术扩展到纳米对象的成像和表征。这可以通过Picsecond Ultrasonics来实现，其中通过使用超快激光器，可以生成和检测具有频率至Terahertz的声波，直至Terahertz和波长至纳米。在我们的工作中，我们提出了基于微型模式锁定的半导体激光器的Picsecond Ultrasonics设置，其性能使我们能够获得必要的功率，脉搏持续时间和重复率。使用这样的激光器，我们在沉积在半导体基板上的Al膜中测量具有皮秒分辨率的超声回声信号。我们表明，所获得的信号与用标准块模式锁定的Ti-SA激光器获得的信号一样好。该实验为根据微型半导体激光器设计集成的便携式Picsecond超声设置铺平了道路。
There is a great desire to extend ultrasonic techniques to the imaging and characterization of nanoobjects. This can be achieved by picosecond ultrasonics, where by using ultrafast lasers it is possible to generate and detect acoustic waves with frequencies up to terahertz and wavelengths down to nanometers. In our work we present a picosecond ultrasonics setup based on miniaturized mode-locked semiconductor lasers, whose performance allows us to obtain the necessary power, pulse duration and repetition rate. Using such a laser, we measure the ultrasonic echo signal with picosecond resolution in a Al film deposited on a semiconductor substrate. We show that the obtained signal is as good as the signal obtained with a standard bulky mode-locked Ti-Sa laser. The experiments pave the way for designing integrated portable picosecond ultrasonic setups on the basis of miniaturized semiconductor lasers.
