Multi-wavelength high-energy gas-filled fiber Raman laser spanning from 1.53  µm to 2.4  µm

Area of Science:

• Nonlinear Optics
• Laser Physics
• Fiber Optics

Background:

• Raman lasers offer tunable wavelength generation.
• High-pulse-energy lasers are crucial for various applications.
• Fiber-based Raman scattering provides a compact platform.

Purpose of the Study:

• To develop a high-pulse-energy multi-wavelength Raman laser.
• To achieve tunable output from 1.53 µm to 2.4 µm.
• To investigate the influence of hydrogen pressure on Raman line energy.

Main Methods:

• Utilized cascaded rotational stimulated Raman scattering.
• Employed a 5 m hydrogen-filled nested anti-resonant fiber.
• Pumped the system with a ~13 kW, 7 ns C-band Er/Yb fiber laser.

Main Results:

• Generated distinct Raman lines at 1683 nm, 1868 nm, 2100 nm, and 2400 nm.
• Achieved maximum pulse energies of 18.25 µJ, 14.4 µJ, 14.1 µJ, and 8.2 µJ for the respective lines.
• Demonstrated control over Raman line energy by adjusting hydrogen pressure (1-20 bar).

Conclusions:

• Successfully developed a high-pulse-energy multi-wavelength Raman laser.
• The cascaded Raman scattering in H2-filled fiber is an effective method for broadband generation.
• Hydrogen pressure offers a viable tuning mechanism for output energy control.