Abstract
Publisher Summary A free-electron laser (FEL) is a coherent optical source using electron beam in a magnetic field as a gain medium. The FEL system consists of an electron accelerator, an undulator in which the electrons emit the synchrotron radiation, and an optical resonator. By virtue of its simple gain medium, FEL has unique advantages: wide-range wavelength tunability, ultrashort pulse operation, and intense peak power. A high-power coherent laser beam in terahertz and infrared region reveals the novel properties of semiconductors. The FEL operates with ultra-short pulses having a complex pulse structure; it is necessary to generate near-infrared/visible pulses synchronized with the FEL pulses to measure the absorption spectra of compound semiconductors with high accuracy. This chapter presents the use of a mode-locked neodymium-doped yttrium lithium fluoride (Nd:YLF) laser for generating the synchronous near-infrared/visible beams. It describes the generation of the second harmonic light of an Nd:YLF-laser beam, synchronizing with the mid-infrared FEL pluses. The Nd:YLF pulses synchronize with the FEL pulses with the accuracy of the detectors' response time.
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