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Related Experiment Video

Updated: Jun 16, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Octave-spanning, continuously tunable injection-seeded backward terahertz-wave parametric oscillator.

Joselito E Muldera, Kouji Nawata, Yuma Takida

|June 14, 2025

Summary

This study introduces an advanced backward terahertz-wave parametric oscillator (BW-TPO) offering octave-spanning tunability. This innovative optical source enables broader applications in nondestructive imaging and spectroscopy.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: June 8, 2018

Area of Science:

Optics and Photonics
Terahertz Science
Nonlinear Optics

Background:

Terahertz-wave parametric oscillators (TPOs) are crucial for generating tunable terahertz (THz) radiation.
Achieving broad tunability and octave-spanning bandwidth in TPOs remains a significant challenge.
Existing THz sources often lack continuous tunability or require complex setups.

Purpose of the Study:

To develop an all-optical, continuously tunable, octave-spanning backward terahertz-wave parametric oscillator (BW-TPO).
To demonstrate a novel method for achieving broadband tunability using specially designed periodically poled lithium niobate (PPLN) crystals.
To explore the potential of this BW-TPO as a source for advanced imaging and spectroscopy applications.

Main Methods:

Utilizing a pulsed Nd:YAG laser and a continuous-wave seed laser for pumping the BW-TPO.
Employing four specially designed slant-stripe-type periodically poled lithium niobate (PPLN) crystals as gain media.
Implementing an off-center rotation technique for the PPLN crystal to maximize broadband tunability.

Main Results:

Achieved a mode-hop-free tunable bandwidth exceeding 400 GHz from a single PPLN crystal.
Demonstrated a frequency span of up to 1.7 octaves from a single crystal.
Obtained a total tunable coverage of 763 GHz (over 2 octaves) across all proposed crystals.

Conclusions:

The developed injection-seeded BW-TPO provides an innovative, all-optical source with unprecedented octave-spanning tunability.
The use of specially designed PPLN crystals and off-center rotation significantly enhances tunability.
This BW-TPO is a promising emitter for nondestructive imaging techniques like swept-source optical coherence tomography and sub-terahertz frequency spectroscopy.