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Webb C.E., Jones J.D.C. (eds.) Handbook of Laser Technology and Applications, Volume II.. Laser Design and Laser Systems (IoP, 2004)(T)(K)(600dpi)(1263s)(ISBN 0750309601)_EO_.djvu |
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Size 37.8Mb Date Jan 29, 2006 |
control output power...
The relevant transition probabilities are shown for the laser transitions as well as
for the transitions on which the lower levels decay...
The only region that is necessary to be heated is the region of the discharge capillary bore
where the excitation and amplification occur...
Hence, whether Penning ionization from He metastable atoms or electron excitation from the Cd ion
ground state is the dominant excitation mechanism to the Cd upper laser levels, the Penning ionization
process plays a major role in producing the high degree of ionization of the Cd atom...
Inserting these values
into a well-known expression for laser power output suggests an optimum output power of 24 mW, which is
approximately what is experimentally achieved...
Energy-level schematic diagram to show id) the basic principle of operation for MIROPLs (and FIROPLs)
and (b) the Raman process, where the pump and emission frequencies are off-resonance from the molecular transitions...
(Reproduced by permission of the
American Institute of Physics.)
Gratings are used in both pump and MIR lasers for wavelength selection...
Recently, an efficient cavity configuration was proposed [30]
which solves many problems including feedback, although it requires accurate focusing of the pump beam
through a hole in the input mirror to the MIR cavity...
If the K = 0 transition is pumped, gain occurs only on the ortho (K — 3n)
transitions [38]...
Other interesting aspects of the NH3 laser are self-pulsing instabilities [74] leading to chaos in the 12 /xm
emission, as predicted for a homogeneously broadened system by Haken [75]...
Although we tend to associate Raman lasers with large pump-frequency offsets, this is not necessarily the
case...
B3.8.7 Optically pumped laser action in C2H2 and its isotopes
The CO2 laser cannot directly optically pump C2H2...
Gordiets B F, Osipov A I, Stupochenko E V, and Shelepin L A 1973 Vibrational relaxation in gases and molecular lasers
Sov...
The laser wavelengths were determined with high accuracy by long path-difference Michelson interfer-
interferometry [9]...
The electric discharge creates a population inversion
between low-lying predominantly stretching modes and bending modes...
In the gas discharge HCN laser, molecules are distributed over all vibrational
states which are quickly depopulated by spontaneous emission cascading down the vibrational levels to the
ground state...
Laser emission of the 337 fim HCN line may be obtained in a discharge
tube with the polymer deposit running the discharge with pure H2O, H2 or NH3...
In the positive column,
striations are formed which become unstable at higher currents causing large fluctuations of the laser output
power...
[ 16] Herzberg G 1945 Molecular Spectra and Molecular Structure II: Infrared and Raman Spectra of Polyatomic Molecules (Princeton,
NJ: Van Nostrand Reinhold) p 279
[17] Hocker L O, Javan A and Ramachandra Rao D 1967 Absolute frequency measurement and spectroscopy of gas laser transitions in
the far infrared Appl...
A very thorough discussion
of chemical processes, excitation and relaxation in the plasma and rate equation models...
This ion offers no
significant channels for parasitic loss of excitation from the upper laser level and essentially 100% quantum
efficiency (—80% power efficiency) can be achieved [6]...
Thus, assuming V — 2.4, so that mode-area = core-area, then equation (B4.1.2.) implies that gain is
proportional to (NAJ...
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