小型化半导体激光器的皮秒超声
Picosecond Ultrasonics with Miniaturized Semiconductor Lasers
摘要：
人们非常希望将超声技术扩展到纳米物体的成像和表征。这可以通过皮秒超声波来实现，其中通过使用超快激光器，可以产生和检测频率高达太赫兹和波长低至纳米的声波。在我们的工作中，我们提出了一个皮秒超声波设置的基础上小型锁模半导体激光器，其性能允许我们获得必要的功率，脉冲宽度和重复率。使用这样的激光器，我们测量的超声回波信号与皮秒分辨率的Al膜沉积在半导体衬底上。我们表明，所获得的信号是一样好的信号与一个标准的笨重的锁模钛萨激光器。实验结果为基于小型化半导体激光器的集成化便携式皮秒超声装置的设计奠定了基础。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
