Optical coupler

for pump

Output Coupler is multipurpose optical component - output cavity mirror or and partially reflective mirror. Choose split ratio and tolerance - precision (IBS or MS coating) or standard (E-beam, IAD coating). How output couplers influence laser properties? Pump threshold, effciency, stability, etc. Controlling threshold pump power using Output Couplers Threshold pump power is a minimum amount of energy required to start the lasing process. You can use Alien Photonics output couplers to control it by choosing the required amount of light to transmit or reflect back to cavity. Higer reflection of output coupler (less light is lost) means lower threshold pump power (it is easier to start lasing). Increasing and decreasing output power using Output Couplers Overall efficiency (ratio of output power to pump power) is impacted by output couplers reflection and transmission values. Alien Photonics recommends to carefully choose the reflection, because if reflectivity is too high – it will reduce the output power. Increasing laser stability with Output Couplers Changes in environment or within the laser system (e.g. temperature fluctuations) can impact output couplers and thus the laser performance. During the design stage at Alien Photonics, we carefully choose geometry, substrate and coating materials to ensure the stability of output couplers under various conditions. Plano-Plano (Flat) output coupler Flat output couplers are quite convenient and popular, since it outputs collimated beam. This shape might require precise alignment to prevent high beam divergence, so Alien Photonics recommends this type where complex mode control is not critical.