Laser threshold of viscous active media in the presence of induced absorption at stimulated emission wavelength

1976 ◽  
Vol 6 (11) ◽  
pp. 1272-1275 ◽  
Author(s):  
G A Abakumov ◽  
L T Makarova ◽  
A P Simonov
Keyword(s):  
Stimulated Emission ◽  
Emission Wavelength ◽  
Induced Absorption ◽  
Laser Threshold ◽  
Active Media

scholarly journals Amplification by stimulated emission of nitrogen-vacancy centres in a diamond-loaded fibre cavity

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4505-4518
Author(s):  
Sarath Raman Nair ◽  
Lachlan J. Rogers ◽  
Xavier Vidal ◽  
Reece P. Roberts ◽  
Hiroshi Abe ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gain Medium ◽  
Stimulated Emission ◽  
Nitrogen Vacancy ◽  
Qualitative Model ◽  
Seed Laser ◽  
Laser Threshold ◽  
Cavity System ◽  
Emission Changes ◽  
532 Nm

AbstractLaser threshold magnetometry using the negatively charged nitrogen-vacancy (NV−) centre in diamond as a gain medium has been proposed as a technique to dramatically enhance the sensitivity of room-temperature magnetometry. We experimentally explore a diamond-loaded open tunable fibre-cavity system as a potential contender for the realisation of lasing with NV− centres. We observe amplification of the transmission of a cavity-resonant seed laser at 721 nm when the cavity is pumped at 532 nm and attribute this to stimulated emission. Changes in the intensity of spontaneously emitted photons accompany the amplification, and a qualitative model including stimulated emission and ionisation dynamics of the NV− centre captures the dynamics in the experiment very well. These results highlight important considerations in the realisation of an NV− laser in diamond.

Stray transverse stimulated emission from Raman lasers with cryogenic active media

1977 ◽  
Vol 7 (7) ◽  
pp. 887-889
Author(s):  
S B Kormer ◽  
G G Kochemasov ◽  
V D Nikolaev ◽  
V D Urlin
Keyword(s):  
Stimulated Emission ◽  
Active Media ◽  
Raman Lasers

Induced absorption and stimulated emission in a driven two-level atom

1992 ◽  
Vol 70 (6) ◽  
pp. 427-431 ◽  
Author(s):  
Constantine Mavroyannis
Keyword(s):  
Excited State ◽  
Ground State ◽  
Laser Field ◽  
Low Frequency ◽  
Ultrashort Pulses ◽  
Stimulated Emission ◽  
Spectral Lines ◽  
Laser Photon ◽  
Induced Absorption ◽  
Level Atom

We have considered the induced processes that occur in a driven two-level atom, where a laser photon is absorbed and emitted by the ground and by the excited states of the atom, respectively. In the low-intensity limit of the laser field, the induced spectra arising when a laser photon is absorbed by the ground state of the atom consist of two peaks describing induced-absorption and stimulated-emission processes, respectively, where the former prevails over the latter. Asymmetry of the spectral lines occurs at off-resonance and its extent depends on the detuning of the laser field. The physical, process where a laser photon is emitted by the excited state is the reverse of that arising from the absorption of a laser photon by the ground state of the atom. The former differs from the latter in that the emission of a laser photon by the excited state occurs in the low-frequency regime and that the stimulated-emission process prevails over that of the induced absorption. In this case, amplification of ultrashort pulses is likely to occur without the need of population inversion between the optical transitions. The computed spectra are graphically presented and discussed.

Realization and Characterization of Optically-Pumped GaInN-DFB Lasers

1996 ◽  
Vol 449 ◽  
Author(s):  
R. Hofmann ◽  
V. Wagner ◽  
H-P. Gauggel ◽  
F. Adler ◽  
P. Ernst ◽  
...  
Keyword(s):  
Grating Period ◽  
Emission Wavelength ◽  
Wavelength Shift ◽  
Optically Pumped ◽  
Laser Threshold ◽  
Organic Vapor ◽  
Double Heterostructures ◽  
Metal Organic ◽  
Laser Activity

ABSTRACTWe demonstrate room temperature laser activity of optically pumped GaN/GalnN-DFB-lasers. The ridge-waveguide DFB lasers were realized on GaN/GalnN double heterostructures grown by low-pressure metal-organic vapor phase epitaxy. The best laser threshold we achieved is 1.9 MW/cm2.By varying the grating period, the laser emission wavelength could be tuned from 399 to 415 nm. This allows to determine the dispersion relation of the effective refractive index neff(λ) and the spectral dependence of the pump power density at the laser threshold Pth(λ) over the whole emission range. Furthermore, the shift of the emission wavelength with temperature of the DFB-lasers is investigated and is found to be small compared to the emission wavelength shift of the gain maximum.

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