Single-frequency stable, narrow linewidth diode-pumped solid state (DPSS) lasers are commonly used in many applications and science areas, like high-resolution spectroscopy, optical metrology, gravity-wave detection [1], fundamental physics and others. Many of them require optical amplification of the DPSS seed laser to obtain higher output power while maintaining the excellent optical properties of the laser beam (e.g. Coherent Power Summation for military applications). In Ref.[2] the miniature, single-frequency stable DPSS laser operating at 1064 nm and patented structure of the monolithic microchip resonator Nd:YVO4/YVO4/YVO4 were described (Fig.1a). However, from commercial point of view the DPSS seed laser needs to be inexpensive, mechanically and optically stable for wide temperature range, easy to assemble and service.

© 2019 IEEE

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