2018
DOI: 10.1088/1361-6501/aab987
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Digital frequency offset-locked He–Ne laser system with high beat frequency stability, narrow optical linewidth and optical fibre output

Abstract: We report on the enhancement of a previously-presented heterodyne laser source on the basis of two phase-locked loop (PLL) frequency coupled internal-mirror He-Ne lasers. Our new system consists of two digitally controlled He-Ne lasers with slightly different wavelengths, and offers high-frequency stability and very narrow optical linewidth. The digitally controlled system has been realized by using a FPGA controller and transconductance amplifiers. The light of both lasers was coupled into separate fibres for… Show more

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Cited by 10 publications
(11 citation statements)
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References 14 publications
(23 reference statements)
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“…Instead, we decided to implement a laser-array configuration as originally described in [ 72 ]. The laser module of the NPMM-200 was thus extended with a fiber-coupled digitally frequency offset-locked He-Ne heterodyne source consisting of two commercially available He-Ne lasers (model: SL02/1, SIOS Meßtechnik GmbH [ 73 ]) with the same mechanical design and similar transfer behavior [ 74 ]. The basic control concept of this heterodyne source is indicated in Figure 6 and was described in detail in [ 74 ].…”
Section: Experimental Configuration and Methodsmentioning
confidence: 99%
“…Instead, we decided to implement a laser-array configuration as originally described in [ 72 ]. The laser module of the NPMM-200 was thus extended with a fiber-coupled digitally frequency offset-locked He-Ne heterodyne source consisting of two commercially available He-Ne lasers (model: SL02/1, SIOS Meßtechnik GmbH [ 73 ]) with the same mechanical design and similar transfer behavior [ 74 ]. The basic control concept of this heterodyne source is indicated in Figure 6 and was described in detail in [ 74 ].…”
Section: Experimental Configuration and Methodsmentioning
confidence: 99%
“…By aligning the laser beam to comply with the Abbe principle, the influence of the Abbe error can be minimized [18,20,107,108]. Meanwhile, attention should be paid to stabilize the light wavelength of the laser beam since it is employed as the ruler for displacement measurement in the laser interferometers [109].…”
Section: Multi-axis Optical Displacement Sensorsmentioning
confidence: 99%
“…In contrast to off-the-shelf laser systems, the switching power supplies of both laser tubes were upgraded each with a state-of-the-art model (Model: 121T-1700-4.9, Martek Power) and the power cablings were optimized to suppress side peaks and high frequent distortions (fPS > 700 kHz), which provided an instrumentation noise floor level of less than -90 db [34]. Referring to [34], the linewidth of each He-Ne laser light source have also been subject of investigations and was determined to a value of about 1.5 kHz at this setup. In other words, the gas laser represents a wavelength standard with low phase noise and high optical power [1].…”
Section: Laser System With Two Internal-mirror He-ne Tubesmentioning
confidence: 99%
“…This analog signal is transferred into a discrete signal with TTL level by using a Schmitt-Trigger circuit and represents the input for another FPGA-based control system (referred to as "PXI-system") to lock the metrology laser onto the secondary standard. At this point, the authors refer to previous publications [34,38], in which the developed control system has already been described in detail. The basic method makes use of only a single digital input and one digital-to-analog converter to offsetlock two lasers with a beat frequency fBeat/ML between 0.1 MHz and 20 MHz at our setup.…”
Section: Locking the Metrology Laser To The Secondary Standardmentioning
confidence: 99%