研究目的
Investigating the potential of CO laser down-conversion into the THz range using ZnGeP2 crystal for high-power, frequency-tunable coherent sources.
研究成果
It was found that multi-line CO laser down-conversion in a ZnGeP2 crystal is significantly limited by the crystal absorption in THz range. Optimal phase-matching angle is shifted due to the absorption. High-power nanosecond CO laser pulses or frequency-selective CO laser radiation could enhance the efficiency.
研究不足
The capability of multi-line CO laser down-conversion in a ZnGeP2 crystal is significantly limited by the crystal absorption in THz range. Maximal calculated frequency conversion efficiency was up to 0.006% which is 40 times less due to absorption versus potentially achieved.
1：Experimental Design and Method Selection:
Numerical study of difference frequency generation (DFG) of rotational-vibrational lines of a nonselective CO laser in ZnGeP2 crystal.
2：Sample Selection and Data Sources:
CO laser spectrum from [6], ZnGeP2 crystal properties from [7], and absorption coefficients from [8].
3：8]. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: ZnGeP2 crystal, CO laser.
4：Experimental Procedures and Operational Workflow:
Calculation of phase-matching angles for DFG in ZnGeP2 crystal, simulation of DFG efficiency considering crystal absorption.
5：Data Analysis Methods:
Plane-wave and low frequency conversion efficiency approximation for type II of three-wave interaction.
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