Design of high brightness fiber-coupled green diode laser module

Abstract

As a pump source for Ti: Sapphire solid-state lasers, the fiber-coupled green diode laser module is critical. However, existing study findings are insufficient to meet the demands of high brightness diode laser pump sources. In this paper, a high brightness green diode laser fiber-coupled system based on TO-can diode lasers is designed. The FACs are installed within the TO-can diode lasers. The optical step as the spatial beam combining system is made up of the HR mirror and the optical wedge. We discussed the relationship between the reflected beam deflection angle and the optical wedge surface inclination angle under the condition of different HR mirror inclination angles. After that, a strategy with appropriate heat dissipation effect is obtained through thermal simulation. Finally, the simulation results verify that couple 18 TO-can single emitters into a 50μm core diameter and 0.22 numerical aperture optical fiber with an output power of 16.9W, the fiber coupling efficiency is 98%. The brightness is 5.66 MW/(cm 2 • Sr) and the module dimension is L 220mm×W 80mm×H 45mm.

Design and simulation of high brightness green LD fiber coupling module

“…For judging the beam quality of semiconductor lasers, the method of calculating the optical parameter product is commonly used. When a laser beam passes through an ideal aberration-free optical system, the value of BPP usually remains constant, and the smaller the value of BPP, the better the beam quality [15] . BPP is defined as the product of the beam waist radius ω of the spot and the far-field divergence half-angle θ.…”

High-power fiber-coupled diode laser module with mini-bar stack

“…To get optimal fiber coupling, the beam parameter product of the diode laser stack must satisfy the designated parameters, as shown in Eq. (1.2) [7,8].…”