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Abstract
The resonance of the second harmonic was proposed to improve conversion efficiency in ultraviolet laser. A schematic to generate the fourth harmonic laser with a compound cavity was modeled based on plane-wave approximation. The simulated results show that the mode-matching condition of the multi-mode lasers depends strongly on both frequency-mode spacing and resonator loss. In the case of the same cavity lengths and losses, the tolerance on the optical cavity length should be maintained on tens or hundreds of nanometer scales. Meanwhile, the TEM00 beam can be achieved due to the best mode-matching at resonance and the beam size increases arising from the cavity detune.
Funding
This work had been supported by the National High-Tech R&D Program of China [grant number 2013AA014202]; Knowledge Innovation Program of the Chinese Academy of Science [grant number KJCX2-EW-H03]. We would also like to thank for the financial aid of the natural science foundation of Fujian province (2011J06023, 2013J05106); Fujian high Technology Research and Development Program [grant number 2012H0046].