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Single-frequency coherent terahertz-wave generation using two Cr:forsterite lasers pumped using one Nd:YAG laser
Jun-ichi Nishizawa1, Tetsuo Sasaki, Tadao Tanabe
1Semiconductor Research Institute, Aoba 519-1176, Aramaki, Aoba-ku, Sendai 980-0845, Japan.
The Review of Scientific Instruments
|April 2, 2008
Summary
Researchers created a compact terahertz-wave generator using two Cr:forsterite lasers. This system efficiently produces single-frequency terahertz waves via difference frequency generation, offering a new tool for terahertz science.
Area of Science:
- Optics and Photonics
- Solid-State Physics
- Quantum Electronics
Background:
- Terahertz (THz) wave generation is crucial for various scientific and technological applications.
- Compact and efficient THz sources are highly sought after.
- Difference frequency generation (DFG) is a common method for THz wave production.
Purpose of the Study:
- To develop a compact and efficient terahertz-wave generator.
- To utilize two Cr:forsterite lasers pumped by a single Nd:YAG laser for THz generation.
- To investigate the DFG process in a GaP crystal for THz emission.
Main Methods:
- Constructed a Cr:forsterite laser system incorporating diffraction gratings.
- Tuned Cr:forsterite laser energy via optical alignment and pumping energy.
- Achieved temporal overlap of two Cr:forsterite laser pulses within a GaP crystal for DFG.
Main Results:
- Successfully generated a single-frequency terahertz wave around 2.95 THz.
- The generated THz wave had an energy output of 4.7 pJ.
- The system utilized a 30-cm-long Cr:forsterite laser setup.
Conclusions:
- Demonstrated a compact terahertz-wave generator based on DFG.
- The developed system offers a promising approach for generating tunable THz radiation.
- This compact THz source has potential applications in spectroscopy and imaging.
