Amplification without population inversion in molecules

Bhattacharjee, Anindita; Sanyal, S.; Dastidar, Krishna Rai

doi:10.1016/j.jms.2005.04.015

Cited by 10 publications

(15 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly for v = 1, j = 1 level of A 1 Σ + state, as the upper lasing level the intensities of the probe field and the coupling lasers are 1.5×10 −4 W/cm 2 and 2.5×10 −4 W/cm 2 respectively. Here, by choosing the values of Ω and G close to each other, we have shown that the gain increases almost by four orders of magnitude than the previous values obtained by considering Ω G [21]. It can be shown that in the presence of bidirectional pumping, the magnitude of gain and absorption are reduced in LiH molecule as in the case of H 2 molecule.…”

Section: Gainmentioning

confidence: 51%

“…In figure 4b we have presented the gain profile as a function of ∆ 2 (keeping ∆ 1 = 0) in the steady state limit, without considering the replenishment of the ground state for LiH molecule when v = 0, j = 1 of A 1 Σ + state is the upper lasing level. In our previous work [21], the intensities for the probe field and the coherent field were 10 −5 W/cm 2 and 10 3 W/cm 2 respectively. Here, for LiH is the upper lasing level considering the total spontaneous decay width in place of partial decay width.…”

Section: Gain Profile Considering Total Spontaneous Decay Widthmentioning

confidence: 83%

“…To single out these particular vibrational levels for excitation, the frequencies of the lasers should be carefully chosen so as to avoid resonant excitation from other vibrational levels of the ground state to different vibrational levels of the excited state as discussed previously [21].…”

Section: Schemesmentioning

confidence: 99%

“…Recently our group has studied the feasibility of amplification without population inversion (AWI) in LiH molecule for three-level ladder, V and Λ schemes [21]. The LiH molecule serves as a good model for studying the dependence of gain on the choice of ro-vibrational levels, as the hyperfine splitting is much smaller than the spacing between two rotational (∼10 2 GHz) or two vibrational levels (∼10 4 GHz).…”

Section: Gainmentioning

confidence: 99%

“…We have also shown that AWI can be controlled by choosing different vibrational levels for coherent and probe transitions. Recently we have studied the feasibility of amplification without population inversion (AWI) in LiH molecule for three-level ladder, V and Λ schemes [21]. However, in these studies the effect of bidirectional pumping on the AWI process has not been considered.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Control of amplification without inversion in H2 and LiH molecules: Dependence on relative magnitude of probe and coherent field Rabi frequencies in three-level Λ system

Dutta

Dastidar

2006

Pramana - J Phys

Self Cite

View full text Add to dashboard Cite

Dependence of amplification without inversion (AWI) on the relative strength of probe and coherent field Rabi frequencies has been studied in H 2 and LiH molecules for three-level Λ configuration. We have derived exact analytical expressions for coherences and populations keeping all the orders of probe field Rabi frequency (G) and coherent field Rabi frequency (Ω) in the steady state limit. Previously, first-order approximation (i.e. keeping only the first-order term in G) was used and hence AWI was studied for the condition Ω G. Here, by using the exact analytical expressions of coherences and populations, we have shown that AWI is maximum when Ω is within the same order of probe field Rabi frequency G irrespective of the choice of different ro-vibrational transitions in both the molecules. However, the shape of the gain profile and the maximum value of gain on the probe field and the absorption on coherent field depend on the choice of different ro-vibrational levels as the upper lasing levels. Effect of bidirectional pumping, homogeneous and inhomogeneous broadening on AWI process has been studied. By solving the density matrix equations numerically it has been shown that both the transient and the steady state AWI can be obtained and the numerical values of coherences and populations at large time are in very good agreement with exact analytical values in the steady state limit. It has been shown that in molecules AWI can be obtained on probe field of smaller wavelength than that of the coherent field which has not been observed in atoms so far.

show abstract

Section: Gainmentioning

confidence: 51%

Section: Gain Profile Considering Total Spontaneous Decay Widthmentioning

confidence: 83%

Section: Schemesmentioning

confidence: 99%

Section: Gainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Control of amplification without inversion in H2 and LiH molecules: Dependence on relative magnitude of probe and coherent field Rabi frequencies in three-level Λ system

Dutta

Dastidar

2006

Pramana - J Phys

Self Cite

View full text Add to dashboard Cite

show abstract

Metamaterial made of V-type systems from LiH molecules

Budrigă

2016

Appl. Phys. A

View full text Add to dashboard Cite

Subluminal and superluminal light propagation in the V-type system of the second kind

Budrigă

2015

Opt Quant Electron

View full text Add to dashboard Cite

We study the change of the probe field group velocity from subluminal to superluminal range for the V-type system of the second kind. We solve numerically the density matrix equations system and apply it to a system from the LiH molecule to find the group index of the probe field. We show that the group index of the probe field can be changed from positive to negative within the appropriate choice of the relative phase between the probe and coupling field phases, the incoherent pumping rate and probe detuning.

show abstract

Amplification without population inversion in molecules

Cited by 10 publications

References 63 publications

Control of amplification without inversion in H2 and LiH molecules: Dependence on relative magnitude of probe and coherent field Rabi frequencies in three-level Λ system

Control of amplification without inversion in H2 and LiH molecules: Dependence on relative magnitude of probe and coherent field Rabi frequencies in three-level Λ system

Metamaterial made of V-type systems from LiH molecules

Subluminal and superluminal light propagation in the V-type system of the second kind

Contact Info

Product

Resources

About