High-sensitivity laser confocal tomography based on frequency-shifted feedback technique

High-Precision Laser Self-Mixing Displacement Sensor Based on Orthogonal Signal Phase Multiplication Technique

“…So-called self-mixing interference refers to the fact that a part of the reflected or scattered light feedbacks into the laser cavity and interferes with the original light, resulting in changes in laser output characteristics. Compared with traditional interferometry used to measure the motion of an external target, selfmixing interferometry has been applied in many sensing fields, such as distance [6][7][8][9], angle [10][11][12], displacement [13][14][15][16], velocity [17][18][19], and other fields [20][21][22][23], due to its inherent advantages, such as its simple and compact structure, self-alignment, and low cost.…”