Optimal Design of Piezo-based Actuated Systems in Tunable Diode Lasers
In view of the ubiquitous problems in tunable diode lasers,such as small tuning range of output optical frequency without mode hopping,low scanning frequency and complex structure,the dynamic characteristics of the internal piezo-based actuated systems of tunable diode lasers were stud-ied.Based on the design goals of improving rotation accuracy and reducing axis offset,a multi-leaf parallel star-shaped flexible mechanism structure was proposed.After that,based on the Lagrange e-quation and Duhamel integral,the differential equation of motion and the vibration equation of the pi-ezo-based actuated systems were respectively established.Then,the dynamics model of the flexible mechanisms was established and the structural parameters were optimized.Finally,a test platform was built to explore the mechanical response characteristics of the piezo-based actuated systems and the tunable range of tunable diode lasers.The experimental results show that the first-order natural frequency of piezo-based actuated systems is as 2187 Hz.The maximum axis offset of the flexible mechanisms is as 0.947 mm.In the mode-hop-free tuning performance tests of tunable diode lasers,a mode-hop-free tuning range of 103.5 GHz is achieved at a tuning frequency of 20 Hz.
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维普
