  High-power tunable lasers with good longitudinal and transverse modes are
fundamental tools for exploring quantum physics. Here we report a high-power
continuous-wave injection-locked titanium:sapphire laser with a low-loss cavity
configuration, where only a laser crystal was installed in the laser cavity.
Although the transverse mode was affected by a thermal lens formed in the laser
crystal, the focal length of the thermal lens could be shifted via the
temperature of the laser crystal holder or the pump power. As a result, we
found a condition that 10 W single-frequency oscillation with a good transverse
mode and a slope efficiency of 51% were achieved.
