The displacement self-sensing laser of λ/8 resolution was previously reported, without nonlinear error on principle, and with the function of self-calibration. In this paper, we report out new result: a cube corner prism (CCP) is used for the first time to realize the folding-cavity He-Ne laser; using this technology, we made two important improvements: one is to enhance the robust of the laser, especially the stability of the laser power when one of the cavity mirrors of laser is moved by the object to be measured and thus expanded the measurement range, the other is to increase the potential resolution up to λ/16.In current demonstration, the laser has large cavity length changeable range (60mm) and high potential measurement accuracy of λ/16 (0.040μm for He-Ne laser). This method has prospective benefits to be applied in displacement measurement of high resolution.
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