Highly-efficient generation of coherent light at 2128 nm via degenerate optical-parametric oscillation

• URL: http://arxiv.org/abs/2008.07193v2
• Date: Tue, 18 Aug 2020 21:54:43 GMT
• Title: Highly-efficient generation of coherent light at 2128 nm via degenerate optical-parametric oscillation
• Authors: Christian Darsow-Fromm, Maik Schr\"oder, Julian Gurs, Roman Schnabel, Sebastian Steinlechner
• Abstract summary: Light from established and existing laser sources can be efficiently converted to the 2 $mathrmmu$m regime. Light from the established and existing laser sources can be efficiently converted to the 2 $mathrmmu$m regime.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Cryogenic operation in conjunction with new test-mass materials promises to reduce the sensitivity limitations from thermal noise in gravitational-wave detectors. The currently most advanced materials under discussion are crystalline silicon as a substrate with amorphous silicon-based coatings. They require, however, operational wavelengths around 2 $\mathrm\mu$m to avoid laser absorption. Here, we present a light source at 2128 nm based on a degenerate optical parametric oscillator (DOPO) to convert light from a 1064 nm non-planar ring-oscillator (NPRO). We achieve an external conversion efficiency of $(88.3\,\pm\,1.4)\,\%$ at a pump power of 52 mW in PPKTP (periodically-poled potassium titanyl phosphate, internal efficiency was 94 %), from which we infer an effective non-linearity of $(4.75\,\pm\,0.18)\,\mathrm{pm/V}$. With our approach, light from the established and existing laser sources can be efficiently converted to the 2 $\mathrm\mu$m regime, while retaining the excellent stability properties.

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