A tunable diode laser absorption system for long path atmospheric transmission and high energy laser applications

Rice, Christopher A.; Perram, Glen P.

doi:10.1117/12.874929

Cited by 5 publications

(12 citation statements)

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“…The potassium DPAL variant operating near 770 nm is free from water-vapor absorption but can suffer from molecular oxygen absorption, particularly for long path lengths [17]. The rubidium DPAL operating near 794 nm is coincident with a very weak water-vapor line [30].…”

Section: Discussionmentioning

confidence: 99%

“…1. A detailed description of the device configuration and method for collecting spectra has previously been discussed [17,30]. The tunable diode is a New Focus Velocity laser model 6318 with a 10 mW maximum output, a 890-910 nm tunable range, and less than a 300 kHz linewidth.…”

Section: Tdlas Devicementioning

confidence: 99%

“…The process is repeated for nearly 200 free spectral ranges to cover the available 20 nm spectral scan. Calibration of the frequency axis, baseline removal, and further spectral processing has also been reported [17,30]. Noise when the system is deployed outdoors is generally dominated by telescope jitter and atmospheric turbulence over the path, and collections are typically carried out at night to reduce noise from atmospheric turbulence.…”

Section: Tdlas Devicementioning

confidence: 99%

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Open-path atmospheric transmission for a diode-pumped cesium laser

2012

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A tunable diode laser absorption spectroscopy device was developed to study atmospheric propagation for emerging high-energy laser weapons. The cesium diode-pumped alkali laser operates near 895 nm in the vicinity of several water-vapor absorption lines. Temperature, pressure, and water vapor concentration were determined for 150 m and 1 km open paths with statistical errors of ∼0.2%. Comparison with meteorological instruments yields agreement for the 1 km path to within 0.6% for temperature, 3.7% for pressure, and 2.4% for concentration.

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Section: Discussionmentioning

confidence: 99%

Section: Tdlas Devicementioning

confidence: 99%

Section: Tdlas Devicementioning

confidence: 99%

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Open-path atmospheric transmission for a diode-pumped cesium laser

2012

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“…Calibration of the frequency axis, baseline removal, and further spectral processing has also been reported. 4,5 The broad absorption spectra are highly sampled. A typical spectrum will cover a 10 nm span comprised of 100 free spectral ranges and include over 40 million samples acquired over 2 h. The 512 Hz sample rate gives up to one thousand samples per pressure broadened full width at half-maximum (FWHM) line shape.…”

Section: Introductionmentioning

confidence: 99%

“…Tools for modeling these effects are available 3 but require validated atmospheric absorption data including line shapes and detailed knowledge of the state of the atmosphere. We have developed a deployable, tunable diode laser absorption spectrometer (TDLAS) for this application, [4][5][6] and now extend the performance to include diode pumped alkali lasers (DPAL), solid state lasers (SSL), and chemical oxygen iodine laser (COIL) systems. By comparing the performance of the emerging DPAL system with established performance of COIL and solid-state lasers, laser system trade studies are enabled.…”

Section: Introductionmentioning

confidence: 99%

Open-Path Atmospheric Transmission of Diode-Pumped Alkali Lasers in Maritime and Desert Environments

et al. 2023

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A tunable diode laser absorption spectroscopy (TDLAS) device has been developed to study long path atmospheric transmission for laser weapons applications. By employing a single aperture and retro reflector in a mono-static configuration, the noise associated with atmospheric and platform jitter were reduced by a factor of ∼ 30 and the open-air path length was extended to 4.4 km. Water vapor absorption lines near the rubidium (Rb) and cesium (Cs) variants of the Diode Pumped Alkali Laser (DPAL) near 795 and 894 nm, oxygen lines near the potassium (K) DPAL near 770 nm, and water vapor absorption in the vicinity of the Nd:YAG 1.064 um and Chemical Oxygen Iodine Laser (COIL) 1.3 um lines were studied. The detection limit for path absorbance increases from ΔA = 0.0017 at 100 m path to 0.085 for the 4.4 km path. Comparison with meteorological instruments for maritime and desert environments yields agreement for the 2.032 km path to within 1.5% for temperature, 4.5% for pressure and 5.1% for concentration while agreements for the 4.4 km path are within 1.4% for temperature, 7.7% for pressure and 23.5% for concentration. An ICOS device was also used as a spectral reference to verify location of atmospheric lines. Implications of TDLAS collection system design on signal-to-noise are discussed as well as the effect of path turbulence on baseline noise.

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