High-power, narrow-band, high-repetition-rate, 5.9 eV coherent light source using passive optical cavity for laser-based angle-resolved photoelectron spectroscopy

作者：Omachi J^*; Yoshioka K; Kuwata Gonokami M

来源：Optics Express, 2012, 20(21): 23542-23552.

DOI：10.1364/OE.20.023542

We demonstrate a scheme for efficient generation of a 5.9 eV coherent light source with an average power of 23 mW, 0.34 meV linewidth, and 73 MHz repetition rate from a Ti: sapphire picosecond mode-locked laser with an output power of 1 W. Second-harmonic light is generated in a passive optical cavity by a BiB3O6 crystal with a conversion efficiency as high as 67%. By focusing the second-harmonic light transmitted from the cavity into a beta-BaB2O4 crystal, we obtain fourth-harmonic light at 5.9 eV. This light source offers stable operation for at least a week. We discuss the suitability of the laser light source for high-resolution angle-resolved photoelectron spectroscopy by comparing it with other sources (synchrotron radiation facilities and gas discharge lamp).

• 出版日期2012-10-8