| 摘要 |
A dispersion compensator which is compact, low loss, low cost, and highly stable, and yet capable of varying the dispersion compensation amount without changing the output position of an output beam. The dispersion compensator includes: a first and a second planar mirrors disposed parallel to each other, wherein at least either one of the mirrors has group velocity dispersion whose value varies according to the incident angle of light incident on the mirror; a mirror holding means rotatably holding the first and second mirrors in a direction in which the incident angle of light incident on the first mirror is changed while maintaining the parallel state of the mirrors; and a third mirror disposed so as not to be rotated with the first and second mirrors and reflects light reflected sequentially by the first mirror and the second mirror.
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