Comparison of single-side and double-side pumping of membrane external-cavity surface-emitting lasers

Thermal Behavior and Power Scaling Potential of Membrane External-Cavity Surface-Emitting Lasers (MECSELs)

“…As can be seen, the = 825 nm MECSEL [10] is very close to the simulations as the structure thickness and material composition are very similar. However, for the = 780 nm-emitting AlGaAs-based MECSEL [13], the measured thermal resistance with SiC heat spreaders was about 5.9 K/W. A possible reason for the lower value is its smaller absorption coefficient of ∼ 4 • 10 4 cm −1 for the 532 nm pump light.…”

“…Another important feature of MECSELs recently realized is the possibility of double-side pumping [12], [13], which allows to apply thicker gain structures and hence further scale the power.…”

Quantum dot membrane external-cavity surface-emitting laser at 1.5 μm

“…To optically pump the gain membrane under small pump incident angles below 15 • with an almost circular pump spot, a 90 • off-axis parabolic mirror was integrated in the pump optics. In the future, this pump approach could be extended by a second set of pump optics, positioned on the opposite side of the MECSEL for double-side pumping 11 or pump recycling 31 by reflecting the transmitted pump beam back to the MECSEL structure to increase the pump efficiency. Additionally, a high DOP larger than 99 % was obtained where the s-polarized modes were far more prominent than the p-polarized ones which was reproducible across the sample.…”

“…In turn, this enables to use heat-spreading materials with lower conductivity but more cost-effective as silicon carbide (SiC). Owing to these advantages, recent efforts have led to the demonstration of MECSELs emitting in the red and near-infrared [9][10][11][12][13][14][15] . In this paper, we focus our attention on the important 1.5 μm telecom region, where the DBR technology is particularly difficult due to the low refractive index contrast of InP-based materials.…”

Effect of Non-Resonant Gain Structure Design in Membrane External-Cavity Surface-Emitting Lasers

“…Yet, the MECSEL allows for improved thermal management linked to the use of two heat-spreaders in immediate proximity of the active region [5], [6]. Additional power scaling can be obtained by employing double side [7] or multi-pass pumping [8]. This is enabled by the optical access to both sides of the active region due to the absence of substrate and DBR.…”