A laser apparatus according to the present disclosure includes: a laser output unit configured to perform laser oscillation; and a control unit configured to acquire first laser performance data obtained when the laser output unit performs laser oscillation based on a first laser control parameter, and second laser performance data obtained when the laser output unit performs laser oscillation based on a second laser control parameter, while laser output from the laser output unit to an external device is stopped, and determine whether the second laser performance data has been improved as compared to the first laser performance data.
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