Controllable single-mode random laser using stimulated Raman gain

Area of Science:

• Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Random lasers offer unique spectral properties but lack precise mode control.
• Stimulated Raman scattering provides a narrow gain bandwidth suitable for mode selection.

Purpose of the Study:

• To demonstrate a novel numerical approach for achieving controllable single-mode random lasing.
• To enable selection of specific quasi-modes within a random laser system.

Main Methods:

• Numerical simulation of a 1D random system incorporating stimulated Raman gain.
• Development of a nonlinear transfer matrix method.
• Accounting for Raman gain saturation and frequency-dependent refractive index.

Main Results:

• Achieved controllable single-mode operation in a random laser.
• Demonstrated robust control over the emission spectrum by adjusting pump wavelength.
• Successfully selected desired quasi-modes by aligning the Raman gain profile.

Conclusions:

• The proposed method offers precise control over random laser emission spectra.
• This technique is valuable for applications requiring specific spectral characteristics from random lasers.