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Source: Gentec-EO
Understanding Laser Emission Wavelength
When it comes to determining the wavelength at which a laser will emit, several factors come into play. The physics behind laser emission involves the interplay between the gain medium’s gain and losses. The net gain, which is the gain minus the losses, ultimately dictates the laser’s wavelength. For quasi-three-level laser gain media, the excitation level also influences the shape of the gain spectrum, affecting the emission wavelength.
The Physics of Laser Wavelength
Imagine gradually increasing the pump power of a laser until lasing begins, signifying that the net gain exceeds 0 dB at a specific wavelength. At this point, the laser wave saturates the gain, stabilizing the net gain at 0 dB. In some cases, inhomogeneous gain saturation can lead to broadband emission or emission on multiple laser lines, making the simulation complex.
Modeling Laser Wavelength
Numerical models, such as those used in fiber lasers, can help calculate the laser wavelength. One approach involves considering multiple possible laser wavelengths, with only one wavelength lasing in the steady-state. Another more efficient method is to focus on a single optical channel for the lasing wave, calculating the wavelength where lasing occurs with the lowest excitation level of the laser-active ions.
By implementing specific functions in modeling software, such as calculating the average excitation level and determining the correct laser wavelength, researchers can simulate and predict the laser emission wavelength accurately.
Conclusion
Understanding the physics behind laser emission wavelengths and utilizing numerical models to predict these wavelengths is crucial in laser technology development. By considering factors such as gain, losses, and excitation levels, researchers can optimize laser designs for specific applications and wavelengths.
Source: Abberior Instruments
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