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Annual Meeting Optical Society of America

C2D2 absorption lines in the vicinity of 1529 nm for frequency locking

Christine Latrasse, M. Têtu, Marc Breton, Normand Cyr, Raymond Roberge

Published Jan 1, 1993• 0 citations
Publisher

Abstract

Using a commercial Fourier transform spectrometer (Bomem Inc.), we have recorded the absoption spectrum of the C2D2 molecule near the optical communication wavelength of 1550 nm. As for acetylene C2H2,1 this molecule shows about 50 evenly spaced absorption lines between 1511 nm and 1534 nm. On the other hand, 87Rb presents two resonances at 1529.261 nm and 1529.366 nm, resulting from transitions between excited states.2,3 We compare the characteristics of the absorption profile of C2D2 to that of 87Rb and C2H2 for the purpose of frequency locking of tunable semiconductor lasers.

DOI
10.1364/oam.1993.ms.2

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•Apr 24, 1989•1 citation
Using a commercial Fourier transform spectrometer (Bomem Inc.), we have recorded the absoption spectrum of the C2D2 molecule near the optical communication wavelength of 1550 nm. As for acetylene C2H2,1 this molecule shows about 50 evenly spaced absorption lines between 1511 nm and 1534 nm. On the other hand, 87Rb presents two resonances at 1529.261 nm and 1529.366 nm, resulting from transitions between excited states.2,3 We compare the characteristics of the absorption profile of C2D2 to that of 87Rb and C2H2 for the purpose of frequency locking of tunable semiconductor lasers.
We report the progress of our work on the observation and the characterization of 87Rb vapor resonances in order to frequency-lock a 1529 nm DFB semiconductor laser. We present energy levels diagrams corresponding to the 5P3/2 yields 4D5/2 and 4D3/2 transitions of rubidium atoms, respectively at 1529.4 and 1529.3 nm (196.02 and 196.04 THz). Basic emission characteristics of our DFB laser are also given. We then show the absorption profiles of a probe laser emitting around 1529 nm while the 87Rb vapor is optically pumped at 780.2 nm (D2 line at 384.2 THz) using a 30 mW AlGaAs laser. We finally present, for this experiment, the dependence of the probe laser absorption resonance depth and linewidth on the pump power.
) vibrational-rotational transitions in the 1520-1540 nm wavelength range for a self-referencing homodyne detection of a sub-nanosecond optical phase modulation is reported. In the proposed configuration the collinearly propagating coherent dipole radiation of the excited molecule acts like a phase-locked reference wave (local oscillator) that enables transformation of the initial phase modulation into the intensity one. This technique does not need high light intensity and can operate in a linear range of the medium optical absorption. The linear optical phase demodulation (i.e., transformation of the phase-to-amplitude light modulation) is interpreted as an introduction of an additional phase shift to the carrier frequency component of the modulated signal in the maximum of the dispersion curve of a narrow optical absorption peak. It has been experimentally demonstrated with the bulk 10 cm long cuvette filled with low pressure (∼2 Torr) acetylene at room temperature. Effective demodulation of the milliwatt-scale incident laser wave of a single- and multi-mode structure is shown. As expected, the response to the fast (<1 ns) phase modulation was quadratic when the acetylene inhomogeneous Doppler-broadened (∼500 MHz) absorption line is excited in its center and was linearized by tuning at one of the absorption line sides. It is of a differentiating (high-pass) type with the cutoff frequency determined by the total spectral width of the utilized absorption line. Expected detection resolution is determined by the photon noise of the incident light intensity.
We report results on characterization of the self-reference interferometric configuration based on quantum memory of the acetylene (12C2H2) molecules at the wavelength of 1530.37 nm of the vibrational–rotational P9 absorption line. The demodulator under consideration is robust, simple, operates at room temperature with the wavefronts of high etendue of the sub-mW power scale, and needs neither phase, no frequency locking loops. Proposed original balance detection schemes enable effective suppression of the semiconductor laser phase noise, and the shot-noise-limited demodulation resolution at frequencies higher than the high-pass configuration cut-off frequency ≈0.25 GHz.
In recent years, much work has been done in experimental studies to frequency lock laser diodes to atomic or molecular resonances.1 By such techniques it is possible to improve greatly the laser frequency stability and to define precisely its nominal value. For laser sources operating in the 0.8-μm range, rubidium is the preferred specie and each isotope offers two resonance lines, one at 780 nm (D2 line) and one at 795 nm (D1 line). Both linear and saturated absorption have been used, and laser frequency charcteristics are published.2,3