研究目的
Investigating the feasibility and performance of a terahertz gas laser pumped by a mid-infrared quantum-cascade laser using 15NH3 as the gain medium.
研究成果
The study demonstrates the feasibility of a 15NH3 gas laser pumped by a mid-infrared QCL, with potential for improvement through more efficient pumping schemes and exploration of other molecular species. The maximum THz output power achieved was approximately 8 μW for a pump power of 210 mW.
研究不足
The output power of the QCL-pumped THz gas laser is not yet competitive with THz QCLs or CO2 laser-pumped sources. Challenges include the need for more efficient pumping schemes and exploration of additional molecular species for broader frequency coverage.
1：Experimental Design and Method Selection:
The study employs a distributed-feedback mid-infrared quantum-cascade laser (QCL) as a pump source for a terahertz (THz) gas laser, utilizing a standing wave resonator and 15NH3 as the gain medium. The design focuses on achieving low parasitic losses and efficient pumping.
2：Sample Selection and Data Sources:
The gain medium is 15NH3, with its absorption spectrum covered by the QCL pump source. The THz output is detected using a Golay cell or a microbolometer camera.
3：List of Experimental Equipment and Materials:
Includes a commercial distributed-feedback mid-infrared QCL, a standing wave resonator with spherical mirrors, an oversized circular copper waveguide, and detection equipment like a Golay cell and a microbolometer camera.
4：Experimental Procedures and Operational Workflow:
The QCL frequency is tuned to match the pump transition of 15NH3, with the THz cavity length adjusted to meet the resonance condition. The gas pressure is varied to study THz lasing dependence.
5：Data Analysis Methods:
The THz output power is measured as a function of gas pressure and pump power, with frequency calibration performed using methanol transitions.
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