[1] [1] Emmerich Muller, Wolfgang Reichert, Clemens Ruck et al.. External-cavity laser design and wavelength calibration. Hewlett-Packard Journal, 1993, 44(1): 20～27

[2] [2] Schremer A. T., Tang C. L.. External-cavity semiconductor laser with 1000 GHz continuous piezoelectric tuning range. IEEE Photon. Technol. Lett., 1990, 2(1): 3～5

[3] [3] J. Mellis, S. A. Al-Chalabi, K. H. Cameron et al.. Miniature packaged external-cavity semiconductor laser with 50 GHz continuous electrical tuning range. Electron. Lett., 1988, 24(16): 988～989

[4] [4] F. Favre, D. Le Guen, J. C. Simon et al.. External-cavity semiconductor laser with 15 nm continuous tuning range. Electron. Lett., 1986, 22(15): 795～796