研究目的
Investigating the generation of powerful THz pulses with controllable number of THz field oscillations in chirped aperiodically poled lithium niobate crystal using a sequence of femtosecond laser pulses with chirped delays.
研究成果
A simple theoretical model is developed for nearly single-cycle THz pulse generation in a chirped APPLN crystal pumped by a sequence of femtosecond laser pulses. The peak THz electric field strength of 0.3 MV/cm is predicted for intensities of the separate laser pulses of about 20 GW/cm2. The electric field strength can be increased by focusing the THz beam and increasing the pump power.
研究不足
The theoretical model neglects pump pulse depletion and its spatial and temporal distortions during propagation in the crystal. The absolute value of the field strength is estimated with constant factor accuracy.
1：Experimental Design and Method Selection:
The study uses a theoretical model to analyze the generation of THz pulses in a chirped aperiodically poled lithium niobate (APPLN) crystal pumped by a sequence of femtosecond laser pulses. The radiating antenna model is employed for calculations.
2：Sample Selection and Data Sources:
A linearly-chirped APPLN crystal with domains lengths decreasing from the front to the end of the crystal is considered.
3：List of Experimental Equipment and Materials:
The study mentions the use of APPLN crystal and femtosecond laser pulses but does not specify brands or models.
4：Experimental Procedures and Operational Workflow:
The THz electric field in the time domain is calculated using a theoretical model, neglecting pump pulse depletion and its spatial and temporal distortions during propagation in the crystal.
5：Data Analysis Methods:
The temporal forms of THz pulses and their spectra are analyzed based on the theoretical model.
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