Moreover, an observing device according to the present invention is a device for observing an subject, and comprises the light source device according to the present invention mentioned above, an irradiating optical system for focusing and irradiating light output from the light source device onto {HEAD ~ an observation spot} within the subject, a scanning unit for scanning the observation spot within the subject, and a detecting optical system for detecting {TAIL ~ light} generated as a result of focusing and irradiating light onto the observation spot by the irradiating optical system 
Moreover , an observing device according to the present invention is a device for observing an subject , and comprises the light source device according to the present invention mentioned above , an irradiating optical system for focusing and irradiating light output from the light source device onto { HEAD ~ an observation spot } within the subject , a scanning unit for scanning the observation spot within the subject , and a detecting optical system for detecting { TAIL ~ light } generated as a result of focusing and irradiating light onto the observation spot by the irradiating optical system
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