Double-pass pumped extracavity optical parametric oscillator with passive optical feedback suppression

作者：Alyamani A; Algahtani M; Rusak A A; Orlovich V A; Dashkevich V I^*; El Desouki M

来源：Laser Physics, 2016, 26(4): 045804.

DOI：10.1088/1054-660X/26/4/045804

• extracavity optical parametric oscillator
• KTP crystal
• Nd:KGW pump laser
• passive feedback suppression
• eye-safe radiation

We demonstrate a simple way of building a compact eye-safe laser source based on a double-pass pumped extracavity optical parametric oscillator (EOPO) without an optical Faraday isolator. A Nd:KGW pump laser (PL) and the KTP EOPO located close to the PL are designed with stable cavities, while the 100% end system mirrors form an unstable cavity with sufficiently high threshold at 1067 nm. At the 6.6 J pump of the Nd: KGW laser, the EOPO output energy obtained at 1577 nm is 14.7 mJ, corresponding to the conversion efficiency of 33% with respect to the fundamental. The pulse width is 7 ns and the output beam divergence is 3 times diffraction limit.

• 出版日期2016-4