Experimental Study On Ho:SSO Saturable Absorber-based Pulse Laser Output At 1.9 ?m

The 2 ?m band laser is located in the atmospheric transmission window and the absorption peak of water,which is very suitable for atmospheric laser remote sensing and laser medical operation.Thulium-doped solid-state laser is an important technology for directly producing 2 ?m band laser source,At the same time,the Q-switching technology is the most effective way to obtain the high-energy pulse output and enhance the peak power of the output pulse,especially for the sub-microsecond pulsed laser emitters,which plays an irreplaceable importance role.Sub-microsecond optical pulses in the 2 ?m band have important application in the field of light-stimulated auditory neurodynamics and atmospheric laser detection.The generation of sub-microsecond laser pulse is directly dependent on the properties of saturable absorbers in passive Q-switching operation,nonlinear materials are usually required to have appropriate absorption loss and transient switching response,which are used to obtain full depth modulation and pulse shape symmetry to long-term stable output characteristics.In this paper,a novel Ho3+-doped scandium silicate crystal(Ho:SSO)is used as a saturable absorber,Experimental study of the potential of Ho:SSO for the generation of 1.9 ?m wavelength sub-microsecond pulsed laser sources.Experimental study on the pulse characteristics of Ho:SSO crystal as SA for passively Qswitched Tm:YAP laser.Under the Ho:SSO passive Q-switching operation,the laser achieves strong and stable output of microsecond pulsed.This wavelength laser has a very good excitation effect in the application of optical auditory neurodynamics.The pulse output characteristics of hybridization Q-switched Tm:YAP laser for acousto-optic crystal and Ho:SSO crystal have been studied experimentally.In design,pulse width compression using acousto-optic active Q-switching technology,at the same time,the properties of Q-switched wavelength locked in secondary absorption peak by Ho:SSO crystal saturated absorption,which is achieved the stable output of 100 nanosecond pulsed laser with a central wavelength of 1886 nm.The influence of the sound-light switching frequency and the operating temperature of the saturated absorber Ho:SSO on the pulse output characteristics is discussed,and the optimization of laser performance has been completed.Amicrosecond to 100 nanosecond pulsed laser emitter with output wavelength of 1886 nm has been realized.