Observation of saturated dispersion resonances of methane in a two-mode Cr²⁺: ZnSe/CH₄laser

Application of the methane saturated dispersion resonance near 2.36μm over the temperature range of 77–300 K for optical frequency standards

“…The lack of detailed information regarding the line positions, the line intensities and their temperature dependencies, and the linewidths has often hindered the further development of lasers with high frequency stability. A solid-state cw Cr 2+ : ZnSe laser has been used for Doppler-free spectroscopy of 20 methane vibrational-rotational ν 1 + ν 4 band lines [25,26]. Saturated-dispersion resonances of the R(2) line component near 2.36 µm were observed [27].…”

“…Saturated-dispersion resonances of the R(2) line component near 2.36 µm were observed [27]. A compilation of methane line data for the frequency range of 4136 to 4666 cm −1 [28] has been obtained, but more information must be obtained regarding the methane line characteristics and their dependencies on external factors, such as 25 the temperature, pressure, and saturation parameter.…”

Study of the formation of a microrelief on ZnSe- and CdSe-crystal surfaces ablated by excimer KrF-laser radiaton

“…Recently, using a variety of compounds of this type, doped by the divalent ions of transition metals (ZnSe : Cr, ZnSe : Fe, CdSe : Cr, etc. ), efficient optically pumped mid-IR lasers have been developed, operating both in the pulsed and cw regimes [15 - 19] and possessing a significant potential for practical applications [20,21]. In this regard, of undoubted interest is the development of the methods of deposition of broadband AR coatings on the surfaces of laser elements on the basis of II - VI crystals, which allow the losses to be minimised both at the pump wavelength and in a broad (~1 mm) spectral range of lasing, while maintaining the radiation resistance of the material.…”

Continuous-wave broadly tunable diode laser array-pumped mid-infrared Cr2+:CdSe laser

“…Future applications of these lasers include remote sensing [8], highly sensitive spectrum analysis [9][10][11], and spectroscopy across the mid-infrared molecular 'fingerprint region' [12], which is very important for applications such as early cancer diagnostics [13] and gas sensing [14,15]. A potential application of mid-infrared lasers is in master oscillators with a short-term frequency stability σ = − 10 15 -10 −16 , which are based on lasers stabilized by Doppler-free saturated absorption and saturated dispersion resonances in low-pressure gas cells [16,17].…”