Ring solid-state Raman laser at 1538 nm

✍ Scribed by V.I. Dashkevich; V.A. Orlovich

• Book ID: 102452504
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 121 KB
• Volume: 8
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.201110049

✦ Synopsis

A ring KG(WO 4 ) 2 (KGW) Raman laser converting the multimode radiation of a Q-switched Nd:KGW pump laser oscillating on the 4 F 3/2 → 4 I 13/2 transition into the first Stokes at 1538 nm has been demonstrated for the first time as far as we know. With a 22-mm crystal in each section of a three-mirror ring cavity, the Raman laser generates eye-safe radiation of energy ∼ 7 mJ and duration ∼ 15 ns. The beam divergence does not exceed 4.7 mrad. The conversion efficiency reaches ∼ 20%, and the slope efficiency is ∼ 42%. Upon elimination of the parasitic Stokes radiation induced by the Fresnel reflection from the AR-coated crystal ends in the opposite direction along the path of the pump beam the Raman laser provides unidirectional oscillation without using auxiliary optical elements.