Related Experiment Video
Updated: Oct 17, 2025
09:38
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
12.3K
Dual-comb ranging with frequency combs from single cavity free-running laser oscillators
Optics Express
|October 7, 2021
Summary
This study demonstrates a simplified laser ranging technique using free-running dual-comb solid-state lasers, achieving high-resolution distance measurements for industrial applications. This method offers a path to sub-micrometer resolution and kilometer-scale ranges.
Area of Science:
- Optics and Photonics
- Laser Technology
- Metrology
Background:
- Dual optical frequency combs offer high-resolution, long-range laser ranging but are complex for industrial use.
- Stabilized dual-comb systems present significant challenges in terms of complexity and cost.
Purpose of the Study:
- To demonstrate laser ranging using simplified, free-running dual-comb solid-state laser oscillators.
- To overcome the complexity limitations of traditional dual-comb systems for practical applications.
Main Methods:
- Dual-comb operation achieved via polarization duplexing within a single laser cavity.
- Implementation using a mode-locked integrated external cavity surface-emitting laser (MIXSEL) and a Yb:CaF2 solid-state laser.
- Distance measurements to a moving mirror validated against a HeNe interferometer.
Main Results:
- Achieved measurement resolutions of 1.36 µm with the MIXSEL and 0.55 µm with the Yb:CaF2 laser.
- Demonstrated the first laser ranging using free-running dual-comb solid-state oscillators.
- Results confirmed by parallel measurements using a HeNe interferometer.
Conclusions:
- Free-running dual-comb solid-state oscillators provide a viable, less complex alternative for high-resolution laser ranging.
- Potential for further optimization to achieve sub-micrometer resolution and ranges exceeding 1 km.
- This technique is promising for industrial applications requiring precise distance measurements.
Related Concept Videos
01:28Standing Waves in a Cavity
1.1K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.1K
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
999
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
999
01:30Oscillations In An LC Circuit
2.6K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.6K
01:12Double Resonance Techniques: Overview
359
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
359