%0 Journal Article %T Comparative Study on Mode-Selection and Tuning Principle of Several Birefringent Filters %J - %D 2017 %X Bireftingent filters play an important role in many fields such as laser technology, etc. This paper describes the mode-selection and tuning principle of several sets of new birefringent filters. Including PBS-HWP combination, PBS-QW combination, PBS-LN crystal combination and PBS-QWPs combination. The advantages and disadvantages of these bireftingent filters are analyzed, mainly about the convenience and laser structure, which are in good agreement with experiment results. %K Birefringent Filter %K Lasers %K Frequency Tuning %U http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=182&doi=10.11648/j.sd.20170502.19