Using Nd^3+,Cr^4+:YAG as a laser crystal and saturable absorber simultaneously,we obtain a self-Q-switched and mode-locking laser at 1.06μm with straight cavity structure.Self mode-locking phenomenon was observed at ...Using Nd^3+,Cr^4+:YAG as a laser crystal and saturable absorber simultaneously,we obtain a self-Q-switched and mode-locking laser at 1.06μm with straight cavity structure.Self mode-locking phenomenon was observed at an intracavity intensity of only about 2000 W/cm^2.More than 90% modulation depth is achieved at an intracavity intensity of less than 3.0×10^4 W/cm^2 for the first time.The Q-switched pulse width and repetition rate are found to be connected with the cavity length and the output power.展开更多
By means of both a theory for pressure-induced shifts(PS) energy spectra and a theory for shifts of energy spectra due to electron-phonon interaction(EPIP.the pure electronic PS and the PS due to EPI of R1 line,R2 lin...By means of both a theory for pressure-induced shifts(PS) energy spectra and a theory for shifts of energy spectra due to electron-phonon interaction(EPIP.the pure electronic PS and the PS due to EPI of R1 line,R2 line,and U band of GSGG:Cr^3+ at 300 K have been calculated,respectively.The calcualted results are in good agreement with all the experimental data.Their physical origins have also been explained.It is found that the mixingdegree of t2^2(^3T1)e^4T2) and |t2^3 3E>base-wavefunctions in the wavefunctions of R1 level of GSGG:Cr^3+ at 300K is remarkable under normal pressure,and the mixing-degree rapidly decreases with increasing pressure.The change of the mixing-degree with pressure plays a key role not only for the pure electronic'PS of R1 line and R2 line but also the PS of R1 line and R2 line due to EPI.The pressure-dependent behaviors of the pure electronic 'PS of R1 line(or R2 line) and the PS of R1 line(or R2 line) due to EPI are quite different.It is the combined effect of them that gives rise to the total PS of R1 line(or R2 line).In the range of about 15 kar-45kbar,the mergence and /or order-reversal between t2^2(3T1)e^4T2 levels and t2^32T1 levels take place,which cause the fluctuation of the rate of PS for t2^2(3T1)e^4T2(or t2^32T1) with pressure,At 300K,both the temperature-dependent contribution to R1 line(Or R2 line or U band) from EPI and the temperature-independent one are important.展开更多
By means of both the theory for pressure-induced shifts (PS) of energy spectra and the theory for shiftsof energy spectra due to electron-phonon interaction (EPI), at 300 K, the 'pure electronic' contributions...By means of both the theory for pressure-induced shifts (PS) of energy spectra and the theory for shiftsof energy spectra due to electron-phonon interaction (EPI), at 300 K, the 'pure electronic' contributions and the contri-butions from EPI to R1 line, R2 line, and U band of GGG:Cr3+ as well as their PS have been calculated, respectively.The total calculated results are in good agreement with all the experimental data. Their physical origins have beenexplained. It is found that the mixing-degree of [t2/2(^3T1)e^4T2) and [t3/2^2E) base-wavefunctions in the wavefunctions of R1 level of GGG:Cr^3+ is considerable under normal pressure, and the mixing-degree rapidly decreases with increasingpressure. The change of the mixing-degree with pressure plays a key role for PS of R1 line or R2 line. At 300 K, boththe temperature-independent contribution to R1 line (or R2 line or U band) from EPI and the temperature-dependentone are important. The remarkable difference between pressure-dependent behaviors of PS of R1 lines of GGG:Cr^3+ andGSGG:Cr^3+ results from the differences of their microscopic properties. The features of emission spectra of GGG:Cr^3+at various pressures have satisfactorily been explained.展开更多
文摘Using Nd^3+,Cr^4+:YAG as a laser crystal and saturable absorber simultaneously,we obtain a self-Q-switched and mode-locking laser at 1.06μm with straight cavity structure.Self mode-locking phenomenon was observed at an intracavity intensity of only about 2000 W/cm^2.More than 90% modulation depth is achieved at an intracavity intensity of less than 3.0×10^4 W/cm^2 for the first time.The Q-switched pulse width and repetition rate are found to be connected with the cavity length and the output power.
文摘By means of both a theory for pressure-induced shifts(PS) energy spectra and a theory for shifts of energy spectra due to electron-phonon interaction(EPIP.the pure electronic PS and the PS due to EPI of R1 line,R2 line,and U band of GSGG:Cr^3+ at 300 K have been calculated,respectively.The calcualted results are in good agreement with all the experimental data.Their physical origins have also been explained.It is found that the mixingdegree of t2^2(^3T1)e^4T2) and |t2^3 3E>base-wavefunctions in the wavefunctions of R1 level of GSGG:Cr^3+ at 300K is remarkable under normal pressure,and the mixing-degree rapidly decreases with increasing pressure.The change of the mixing-degree with pressure plays a key role not only for the pure electronic'PS of R1 line and R2 line but also the PS of R1 line and R2 line due to EPI.The pressure-dependent behaviors of the pure electronic 'PS of R1 line(or R2 line) and the PS of R1 line(or R2 line) due to EPI are quite different.It is the combined effect of them that gives rise to the total PS of R1 line(or R2 line).In the range of about 15 kar-45kbar,the mergence and /or order-reversal between t2^2(3T1)e^4T2 levels and t2^32T1 levels take place,which cause the fluctuation of the rate of PS for t2^2(3T1)e^4T2(or t2^32T1) with pressure,At 300K,both the temperature-dependent contribution to R1 line(Or R2 line or U band) from EPI and the temperature-independent one are important.
文摘By means of both the theory for pressure-induced shifts (PS) of energy spectra and the theory for shiftsof energy spectra due to electron-phonon interaction (EPI), at 300 K, the 'pure electronic' contributions and the contri-butions from EPI to R1 line, R2 line, and U band of GGG:Cr3+ as well as their PS have been calculated, respectively.The total calculated results are in good agreement with all the experimental data. Their physical origins have beenexplained. It is found that the mixing-degree of [t2/2(^3T1)e^4T2) and [t3/2^2E) base-wavefunctions in the wavefunctions of R1 level of GGG:Cr^3+ is considerable under normal pressure, and the mixing-degree rapidly decreases with increasingpressure. The change of the mixing-degree with pressure plays a key role for PS of R1 line or R2 line. At 300 K, boththe temperature-independent contribution to R1 line (or R2 line or U band) from EPI and the temperature-dependentone are important. The remarkable difference between pressure-dependent behaviors of PS of R1 lines of GGG:Cr^3+ andGSGG:Cr^3+ results from the differences of their microscopic properties. The features of emission spectra of GGG:Cr^3+at various pressures have satisfactorily been explained.
