Linewidth narrowing in free-space running diamond Brillouin lasers

Abstract

This study analyzes the linewidth narrowing characteristics of free-space-running Brillouin lasers and investigates the approaches to achieve linewidth compression and power enhancement simultaneously. The results show that the Stokes linewidth behavior in a free-space-running Brillouin laser cavity is determined by the phase diffusion of the pump and the technical noise of the system. Experimentally, a Stokes light output with a power of 22.5 W and a linewidth of 3.2 kHz was obtained at a coupling mirror reflectivity of 96%, which is nearly 2.5 times compressed compared with the linewidth of the pump (7.36 kHz). In addition, the theorical analysis shows that at a pump power of 60 W and a coupling mirror reflectivity of 96%, a Stokes output with a linewidth of 1.6 kHz and up to 80% optical conversion efficiency can be achieved by reducing the insertion loss of the intracavity. This study provides a promising technical route to achieve high-power ultra-narrow linewidth special wavelength laser radiations.

Advances in narrow linewidth and wide tuning range external-cavity wavelength-swept lasers

“…A noteworthy point is the long-term stability, which will inevitably influence the development trajectory of ECTLs. Furthermore, the task of calibrating parameters for narrow linewidth wavelength tunable lasers presents a substantial challenge in the current progression of laser technology [68][69][70][71]. This has been one of the key catalysts in the swift advancement of laser linewidth, noise, and stability measurement technologies over recent decades.…”

Wavefront‐Reversal, Low‐Threshold, and Enhanced Stimulated Brillouin Scattering for Arbitrary Structured Light

“…On this basis, some improved configurations for specific application scenarios have been proposed, such as a compact two-cell structure, [9] Brillouin-enhanced four-wave mixing, [10] and a feedback structure utilizing a reflector. [11,12] The various SBS platforms mentioned above have been widely applied in highpower narrow-linewidth lasers, [13,14] microscopic imaging, [15,16] Brillouin LiDAR, [17,18] optical fiber sensing, [19] and information processing. [20,21] Recently, there has been growing interest in structured beams with an inhomogeneous transverse profile involving amplitude, phase, and polarization, owing to their extraordinary properties during propagation and light-matter interactions.…”