A laser source was used as non-contact mode of heating to actuate NiTi/kapton polyimide shape memory alloy (SMA) bimorph. The bimorph was fabricated by depositing NiTi thin film over Kapton polyimide sheet of dimension 5 × 2 cm² using thermal evaporation. The laser parameters such as laser power, scanning speed and number of passes were optimized to ensure actuation without damaging the bimorph. The actuation was carried out at laser powers and scanning speeds of 14 to 16 W and 13–16 mm/s respectively. The displacement of SMA bimorph was found to increase with increase in laser power whereas it decreases with increase in scanning speeds. At lower laser power, the scanning speeds have influenced the actuation behavior to larger extent. Notably at the laser power of 14 W, the influence of scanning speed was significant and registered 53 % reduction in displacement with increase in scanning speeds from 13 mm/s to 16 mm/s. A minimum and maximum displacement of 0.35 mm and 3.8 mm was obtained during laser actuation of bimorph. The temperature experienced during laser actuation has been simulated using COMSOL Multiphysics and corroborated with the actuation behavior of the SMA bimorph. The displacement range and the actuation speed of laser actuation were found to be higher than the conventional electrical actuation. Furthermore, the life cycle analysis has been performed up to 100 laser passes and the phenomenon for reduction in displacement has been discussed in detail. Laser actuation of SMA bimorph could be utilized in thermal switches, adaptive optics and remote actuation of SMA elements etc.

激光源用作加热的非接触模式，以激活NiTi / kapton聚酰亚胺形状记忆合金（SMA）双晶型物。通过在尺寸为5×2 cm ^2的Kapton聚酰亚胺片上沉积NiTi薄膜来制造双晶型物使用热蒸发。优化了激光参数，例如激光功率，扫描速度和通过次数，以确保致动而不会损坏双压电晶片。激励是在激光功率和14到16 W和13-16 mm / s的扫描速度下进行的。发现SMA双压电晶片的位移随激光功率的增加而增加，而随扫描速度的增加而减小。在较低的激光功率下，扫描速度在很大程度上影响了驱动行为。值得注意的是，在14 W的激光功率下，扫描速度的影响非常明显，随着扫描速度从13 mm / s增加到16 mm / s，位移减少了53％。在双压电晶片的激光驱动过程中，获得了0.35 mm和3.8 mm的最小和最大位移。激光驱动过程中经历的温度已使用COMSOL Multiphysics进行了仿真，并与SMA bimorph的驱动行为得到了证实。发现激光致动的位移范围和致动速度高于常规电致动。此外，已经进行了多达100次激光通过的寿命周期分析，并且已经详细讨论了减少位移的现象。SMA双压电晶片的激光驱动可用于热敏开关，自适应光学器件和SMA元件的远程驱动等。寿命周期分析已经进行了多达100次激光通过，并且已经详细讨论了减少位移的现象。SMA双压电晶片的激光驱动可用于热敏开关，自适应光学器件和SMA元件的远程驱动等。寿命周期分析已经进行了多达100次激光通过，并且已经详细讨论了减少位移的现象。SMA双压电晶片的激光驱动可用于热敏开关，自适应光学器件和SMA元件的远程驱动等。