Correction: Pogorelsky, I.V.; Polyanskiy, M.N. Harnessing Ultra-Intense Long-Wave Infrared Lasers: New Frontiers in Fundamental and Applied Research. Photonics 2025, 12, 221

There were some text errors in the original publication [1].

1.

Replacing TV/m with GV/m in the engineering formulas for the electric field strength in the electromagnetic wave:

A correction has been made to 3. Plasma Accelerators, 3.1. Wavelength Scaling in Laser–Plasma Interactions, 3.1.3. Laser Self-Focusing and Channeling, Paragraph 1:

$$E\left[\mathrm{V}/\mathrm{c}\mathrm{m}\right]\approx 2.75\times {10}^{10}\sqrt{I_{18}}$$

2.

Correcting the coefficient in the expression for the electric field strength in the electromagnetic wave:

A correction has been made to 3. Plasma Accelerators, 3.2. Electron Acceleration in Plasma Waves, 3.2.1. Regimes of Laser-Driven Plasma Acceleration, Paragraph 4:

$$E\left[\mathrm{V}/\mathrm{c}\mathrm{m}\right]\approx 2.75\times {10}^{10}\sqrt{I_{18}}$$

3.

Correcting the coefficient in the expression for ${\displaystyle \raisebox{1ex}{$E_a$}\!\left/ \!\raisebox{-1ex}{$E$}\right.}$:

A correction has been made to 3. Plasma Accelerators, 3.2. Electron Acceleration in Plasma Waves, 3.2.1. Regimes of Laser-Driven Plasma Acceleration, Paragraph 4:

$${\displaystyle \raisebox{1ex}{$E_a$}\!\left/ \!\raisebox{-1ex}{$E$}\right.}\approx 3\times {10}^{-11}\lambda \left[\mathsf{\mu }\mathrm{m}\right]\sqrt{n_e\left[{\mathrm{c}\mathrm{m}}^{-3}\right]}$$

4.

Electric field strength values for the case of two-color ionization injection need to be corrected:

A correction has been made to 3. Plasma Accelerators, 3.2. Electron Acceleration in Plasma Waves, 3.2.4. Ultra-Low Emittance LWFA, Paragraph 3:

In this scheme, the roles of plasma bubble generation and electron injection are separated between two lasers of different wavelengths. A circularly polarized LWIR laser, such as a ~10-µm CO₂ laser, with a normalized vector potential $a_0\approx$ 1.2–1.4 corresponding to a field strength of $E\approx$ 0.38–0.45 TV/m, creates a plasma bubble. Simultaneously, a low-power, linearly polarized, femtosecond, short-wavelength laser—such as the second harmonic of a TiS laser at $\lambda \approx$ 400 nm—is tightly focused within the plasma bubble trailing the LWIR pulse. Despite a much smaller normalized vector potential $\left(a_0\approx 0.1\right),$ the electric field produced by this short-wavelength laser is significantly stronger ($E\approx 0.7$ TV/m). This field strength is sufficient to ionize gas components that are otherwise inaccessible to the lower field strength of an LWIR laser. By selectively ionizing these components, the two-color approach enables precise electron injection into the plasma bubble, producing electron bunches with enhanced beam quality.

The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.