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We present two original, all optical techniques, to produce a narrowline laser light, fixed at the frequency of a chosen
reference atomic absorption transition. The first type of systems is an essential improvement of our method 3,4 for laser
spectral locking using a control by two frequency scanned, competitive injections with disturbed power ratio by the
absorption at the reference line. The new development eliminates the narrowing limiting problem, related with the fixed
laser longitudinal mode structure. We have proposed an original new technique for continuously tunable single mode
laser operation in combination with synchronously and equal continuous tuning of the modes of the amplifier. By
adapting the laser differential rate equations, the system is analyzed theoretically in details and is shown its feasibility.
The results are in agreement with previous our experiments. The essential advantage, except simplicity of realization, is
that the laser line can be of order of magnitude and more narrowed than the absorption linewidth. The second system is
based of the laser amplifier arrangement with a gain knock-down from the competitive frequency scanned pulse, except
at the wavelength of the desired absorption reference line. The essential advantages of the last system are that the
problem of fixing laser mode presence is naturally avoided. The theoretical modeling and the numerical investigations
show the peculiarity and advantages of the system proposed. The developed approaches are of interest for applications in
spectroscopy, in DIAL monitoring of the atmospheric pollutants, in isotope separation system and potentially - for
creation of simple, all optical, frequency standards for optical communications. Also, the continuously tunable single
mode laser (and the combination with the simultaneously tunable amplifier) presents itself the interest for many practical
applications in spectroscopy, metrology, and holography. We compare the action and the advantages of the two systems
proposed.
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