[1] A. H. Paxton, W. P. Latham.Unstable resonators with 90° beam rotation. Appl. Opt., 1986, 25(17): 2939～2946

[4] S. Holswade, R. Rivlere, C. A. Huguley et al.. Experimental evaluation of an unstable ring resonator with 90° beam rotation HIQ experitmental results. Appl. Opt., 1988, 27(21): 4396～4406

[5] P. K. Kennedy, K. C. Sun. Geometric modes of an unstable ring resonator with 90° beam rotation. Proc. SPIE, 1990, 1224: 163～171

[6] Yu. A. Anan′cv， V. E. Sherstobitov. Influence of edge effects on the properties of unstable resonators. Sov. J. Quant. Electron., 1971, 1(2): 263～267

[7] R. W. Jones, J. F. Perkins. Transverse mode properties of beam-rotated unstable resonators for free electron laser. AIAA J., 1988, 26(8): 897～900

[8] P. Horwitz. Asymptotic theory of unstable resonator modes. J. Opt. Soc. Am., 1973, 63(12): 1528～1543

[9] W. P. Latham, A. H. Paxton, G. C. Dente. Laser with 90-degree beam rotation. Proc. SPIE, 1990, 1224: 265～282

[11] A. E. Attard. Matrix optical analysis of shew rays in mixed systems of spherical and orthogonal cylindrical lenses. Appl. Opt., 1984，23(16): 2706～2709

[12] D. W. Coutts. Time resolved beam divergence from a copper vapor laser with unstable resonator. IEEE J. Quant. Electron., 1995, QE-31(2): 330～342

[14] Yu. A. Anan′ev. V.I. Kuprenyuk, V. E. Sherstobitov. Propcrties of unstable resonators with field rotation. I. Theoredcal principles. J. Quant. Electron., 1979, 9(9): 1105～1l10

[15] A. H. Paxton. Unstable ring resonator with an intracevity prism beam expander. IEEE J. Quant. Lectron., 1987, QE-23(2): 241～244