研究目的
Demonstrating a high repetition rate, high power, and widely tunable THz parametric amplifier (TPA) with a KTiOPO4 crystal.
研究成果
A high repetition rate, high power, picosecond TPA with a KTP crystal has been demonstrated. A maximum peak power of 1.7 kW (average power ≈89 lW) has been obtained at a frequency of 5.74 THz and a repetition rate of 10 kHz. The THz radiation is expected to be Fourier transform limited with a pulse duration of 5.4 ps (FWHM) and a bandwidth of 81 GHz (FWHM). The repetition rate of the KTP TPA can be increased to 100 kHz, indicating that an average output power at the mW level may be achieved with a stronger pump laser that is commercially available.
研究不足
The peak power density of the pump laser was approximately 8 GW/cm2, while the average power density was only about 0.64 kW/cm2. The repetition rate is limited by the photorefractive effect threshold of the KTP crystal.
1：Experimental Design and Method Selection:
The TPA setup includes a picosecond pump laser, a continuous-wave seed laser, a KTP crystal, and the measurement system. The pump laser is composed of a
2：4 nm picosecond fiber laser and a home-built continuously pumped neodymium-doped yttrium vanadate (Nd:
10YVO4) regenerative amplifier (RA). The TPA seed laser is composed of an external cavity diode laser (ECDL) and an ytterbium-doped fiber amplifier.
3：Sample Selection and Data Sources:
The KTP crystal is z-cut with a thickness of 5 mm.
4：List of Experimental Equipment and Materials:
Includes a Golay cell, THz bandpass filter, optical chopper, and scanning Fabry–Pérot interferometer.
5：Experimental Procedures and Operational Workflow:
The pump and seed lasers are mixed in the crystal with a cross angle determined by the incident angle of the seed laser. The generated THz radiation is measured using a Golay cell.
6：Data Analysis Methods:
The THz radiation's wavelength and bandwidth are measured using a scanning Fabry–Pérot interferometer.
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