Synchronously Intracavity-Pumped Picosecond Optical Parametric Oscillators for Sensors.

Area of Science:

• Laser Physics
• Nonlinear Optics
• Optical Metrology

Background:

• Intracavity phase interferometry requires precise control over optical pulse generation.
• Synchronously pumped optical parametric oscillators (OPOs) offer a route to generating multiple pulse trains.

Purpose of the Study:

• To develop and characterize laser systems for intracavity phase interferometry.
• To enable precise measurement of phase differences between dual picosecond pulse trains.

Main Methods:

• Utilized a diode-pumped passively mode-locked Nd:YVO4 laser as the pump source.
• Employed a periodically poled magnesium-doped lithium niobate crystal in a synchronously pumped OPO.
• Designed linear and ring cavity configurations for dual-pulse generation and quasi-synchronous pumping.

Main Results:

• Achieved generation of two independent trains of picosecond pulses within a single cavity.
• Demonstrated precise measurement of the beat note frequency and phase difference between the pulse trains.
• Observed generation of high harmonics of repetition rate frequencies via quasi-synchronous pumping.

Conclusions:

• The developed OPO-based laser system is suitable for intracavity phase interferometry.
• The system provides a robust platform for applications in pump-probe spectroscopy and telecommunication testing.