Details

Autor(en) / Beteiligte

• Xu, Bolei
• Wu, Yajing
• Sun, Dezheng
• Dai, Hai-Lung
• Rao, Yi

Titel

Stabilized phase detection of heterodyne sum frequency generation for interfacial studies

Ist Teil von

• Optics letters, 2015-10, Vol.40 (19), p.4472-4475

Ort / Verlag

United States

Erscheinungsjahr

2015

Quelle

Optica Publishing Group Journals

Beschreibungen/Notizen

• We present a collinear-geometry heterodyne sum frequency generation (HD-SFG) method for interfacial studies. The HD detection is based on a collinear SFG configuration, in which picosecond visible and femtosecond IR beams are used to first produce a strong local oscillator and then to generate weak SFG signals from an interface. A time-delay compensator, consisting of an MgF2 window, is placed before the sample to introduce the time delay between the local oscillator and the interfacial SFG signals for spectral interferometry. Our HD-SFG method exhibits advantages of long-time phase stability. It is not sensitive to sample heights, does not require reflection correction, and is easy to implement.