Narrow linewidth and demonstration of saturation spectra of the Cesium at 852 nm with high power Al-free DFB laser diodes

V. Ligeret; S. Bansropun; M. Lecomte; M. Calligaro; O. Parillaud; D. Holleville; N. Dimarcq; N. Michel; M. Krakowski

doi:10.1117/12.763432

1 February 2008 Narrow linewidth and demonstration of saturation spectra of the Cesium at 852 nm with high power Al-free DFB laser diodes

V. Ligeret, S. Bansropun, M. Lecomte, M. Calligaro, O. Parillaud, D. Holleville, N. Dimarcq, N. Michel, M. Krakowski

Author Affiliations +

Proceedings Volume 6909, Novel In-Plane Semiconductor Lasers VII; 69091F (2008) https://doi.org/10.1117/12.763432
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

There is a growing demand for precise gyroscopes and atomic clocks for positioning, flight navigation systems and aerospatial applications. One of the prerequisites for atomic optical pumps is a laser diode with high power (≈100mW), narrow linewidth (<2MHz), and spatial qualities (M²<1.5). Another important factor for aerospatial applications is a very high reliability performance of the laser devices. With an aim to address these issues, we have laid down the technological foundation and further developed ridge waveguide distributed feedback (DFB) lasers with an emission wavelength of 852nm corresponding to the D2 cesium transition in atomic clocks. The epitaxy is based on an Al free active region with a GaInP large optical cavity and a single compressive strained GaInAsP quantum well. Fabricated DFB uncoated lasers have shown wavelength emission at 852.12nm with an output optical power of 40mW, a SMSR >30dB at the D2 line, at 37°C. Low self-heterodyne linewidths of 0.8MHz and 1.2MHz were measured respectively at 20mW 12°C and 40mW 37°C. With this uncoated diode, we have realized saturation spectra of cesium atoms to determine the resolution and the stability of the laser diode working on Cs. The saturation spectrum of the D2 line of ¹³³Cs was recorded with a resolution close to the natural line width.

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V. Ligeret, S. Bansropun, M. Lecomte, M. Calligaro, O. Parillaud, D. Holleville, N. Dimarcq, N. Michel, and M. Krakowski "Narrow linewidth and demonstration of saturation spectra of the Cesium at 852 nm with high power Al-free DFB laser diodes", Proc. SPIE 6909, Novel In-Plane Semiconductor Lasers VII, 69091F (1 February 2008); https://doi.org/10.1117/12.763432

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KEYWORDS

Semiconductor lasers

Cesium

High power lasers

Indium gallium phosphide

Laser development

Quantum wells

Atomic clocks

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