Abstract

Solid-state lasers with emission around 600 nm are not very frequent. This wavelength is typically out of range of well established tuneable solid-state systems¹ like Ti:Sapphire or Cr:LiSAF. This spectral range is not covered as well by frequency-doubled or self-frequency doubled lasers operating on the ⁴F_3/2→⁴I_13/2 laser channel² of Nd³⁺. One way to obtain laser radiation around 600 nm is in Pr³⁺ based laser systems¹. An alternative way is generation by nonlinear sum-frequency-mixing of laser radiation around 1.06 and around 1.3 microns produced in Nd³⁺ lasers operating on the ⁴F_3/2→⁴I_11/2 and the ⁴F_3/2→⁴I_13/2 laser channels respectively. We present a laser system generating continuous-wave laser radiation at 605 nm. The system is based on simultaneous oscillation at 1084 nm and 1372 nm in a periodically poled lithium niobate ciystal doped with Nd³⁺ ions and subsequent self-sum-frequency mixing in the same ciystal. The nonlinear process is quasiphase matched by the periodical distribution of ferroelectric domains in the crystal. The whole system is end-pumped at 809 nm.

© 2001 EPS