Patent ID: 6943944

Claim:
A laser microscope comprising: a laser light source configured to emit an ultra-short pulse laser beam; a pulse width adjuster to adjust a pulse width of the ultra-short pulse laser beam; an optical member, which is attachably and detachably disposed with respect to an optical path, and which is configured to lead the laser beam to a sample; an optical member detector configured to detect attachment and detachment of the optical member with respect to the optical path; a light amount detector configured to detect an amount of light emitted from said sample due to multi-photon excitation; and a controller configured to control said pulse width adjuster based on the detected light amount so as to increase the amount of light detected by said light amount detector, when said optical member detector detects one of the attachment and detachment of the optical member with respect to the optical path; wherein when said controller determines that the amount of light detected by said light amount detector is optimized, adjustment of the pulse width by said pulse width adjuster is stopped until said detector again detects one of the attachment and detachment of the optical member with respect to the optical path.