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Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
07:28

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Published on: August 30, 2012

Thermal waveguide OPO.

S T Lin1, Y Y Lin, T D Wang

  • 1Institute of Photonics Technologies, Department of Electrical Engineering, National Tsing-hua University, Hsinchu, Taiwan.

Optics Express
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

A novel optical parametric oscillator (OPO) utilizes a thermally induced waveguide for stable operation. This design more than doubles parametric conversion efficiency, advancing mid-infrared light generation.

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Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Laser Physics

Background:

  • Stable and efficient mid-infrared light sources are crucial for various applications.
  • Optical parametric oscillators (OPOs) are versatile tools for generating tunable coherent light.
  • Achieving high conversion efficiency and stable operation in OPOs remains a key challenge.

Purpose of the Study:

  • To investigate the use of a thermally induced waveguide in a continuous-wave (CW) singly resonant OPO.
  • To evaluate the impact of thermal guiding on OPO stability and parametric conversion efficiency.
  • To demonstrate enhanced performance in the mid-infrared spectral region.

Main Methods:

  • Fabrication of a CW singly resonant OPO incorporating a gain crystal with a thermally induced waveguide.
  • Measurement of the waveguide's numerical aperture under high intracavity power (80 W) at 3.2 micrometers.
  • Comparison of OPO performance with and without the thermal-guiding effect.

Main Results:

  • Successfully implemented a thermally induced waveguide within the OPO gain crystal.
  • Measured a numerical aperture of 0.0062 for the thermal waveguide at 3.2 micrometers and 80 W intracavity power.
  • Observed a greater than twofold improvement in parametric conversion efficiency due to the thermal-guiding effect.

Conclusions:

  • Thermally induced waveguides offer a significant benefit for stable OPO operation.
  • This approach substantially enhances parametric conversion efficiency in mid-infrared OPOs.
  • The findings pave the way for more efficient and robust mid-infrared light sources.