Research On Optical Parametric Oscillator With High Repetition Rate

Based on second-order non-linear optical effect,optical parametric oscillator are now firmly established as versatile and practical sources of broadly tunable coherent radiation capable of accessing extended spectral regions from ultraviolet to the deep-infrared.High-power,high-repetition-rate optical parametric oscillator can be widely applied in the fields of optical frequency metrology,optical telecommunications,real-time ultrafast optical sampling and astronomical spectrograph calibration.Despite advances on high-repetition-rate OPOs,average output signal power is confined to hundreds of milliwatts.Thus,it would be desirable to achieve further improvements in the output power for high-repetition-rate OPOs.Here,we successfully contruct a high-efficiency and high-repitition-rate femtosecond optical parametric oscillator,which is harmonically pumped by a¹01 MHz Yb doped fiber laser system.The main research works are as the followings:1.A homemade Yb-doped photonics crystal femtosecond fiber laser is used as the pump source.The system consists of a Yb³⁺doped femtosecond oscillator and a photonic crystal fiber amplification system.The pump source operates at 1040 nm with a repetition rate of¹01 MHz and a pulse duration of¹00 fs.A synchronously pumped femtosecond oscillator is built which is pumped by the laser amplifier system.The repetition rate of the signal can be runed from multi-GHz to THz based on the“Vernier effect”in the frequency domain.2.By reasonably design the cavity length and mirror parameters and constantly optimize the other parameters of the cavity,we finaly design a V-type optical parametric oscillator.We successfully construct a 910-MHz femtosecond parametric oscillator based on harmonicly pumping.And the characteristics of the signal is researched.3.By exploiting the bidirectional pumping technique,we successfully construct a 910-MHz,watt-level,signal-power-enhanced,compact femtosecond OPO.The OPO is capable of delivering signals across the telecommunication waveband,which will be beneficial for a variety of practical applications.