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

Rice, Christopher A.; Lott, Gordon E.; Perram, Glen P.

doi:10.1364/ao.51.008102

Cited by 10 publications

(12 citation statements)

References 30 publications

(39 reference statements)

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“…The two features on either side of the Cs D 1 emission line are the (0,0,3) [9,4,6]–[8,4,5] on the left and the (0,0,3) [7,2,5]–[6,2,4] blended with the (0,0,3) [10,5,6]–[9,5,5] on the right and collections in this spectral region have been collected and demonstrated previously. 6 There are additional smaller water vapor lines in this spectral area, but they are not immediately visible over short path lengths. The 150 m collection has a baseline signal root mean square (RMS) from 11 184 to 11 185 cm −1 of 0.00169 in absorbance with a peak signal located on the blended pair of water lines at 11 182.36 cm −1 of 0.1238 giving a S/N of about 73.2.…”

Section: Resultsmentioning

confidence: 85%

“…Details on the raw data collected, data from shorter open-paths, and how data is post processed have been published where each diode laser has approximately 0.2 nm of mode-hop-free scan range that must be collected individually and then stitched together in post processing to make a complete spectra. 4–6 The laser scan rate is 0.0017 nm/s and signal is sampled at 512 Hz making collection times for the full range of a given diode laser approximately 2 h. The received signal, I t , has a response so that the observed spectral absorbance,includes a frequency dependent cubic baseline, b , in addition to the absorption cross-section, normalσi(trueν∼) for each atmospheric constituent, i , with concentration, N i . During bi-static collections low pressure (no buffer gas) alkali vapor cells inside a heater block set at 30 °C, 60 °C, and 75 °C for Cs, Rb, and K, respectively, were placed between the receive telescope and the detector to provide a co-witnessed reference of the alkali DPAL pump and emission wavelengths.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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

et al. 2023

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“…Third, the weight of the power supply system of a mobile platform will become less due to the high optical-optical conversion efficiency of a DPAL. Moreover, because of its nontoxic medium and easily maintained configuration, a DPAL can be utilized in an airborne or spaceborne high-powered laser system [17]. A number of teams in the world have paid attention to DPALs for applications of laser processing, aeronautics-astronautics, inertial nuclear fusion, and others [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Theoretical study on temperature features of a sealed cesium vapor cell pumped by laser diodes

Zhang¹,

Wang²,

Cai³

et al. 2014

Appl. Opt.

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The diode-pumped alkali laser (DPAL) is a new type of laser source which has been widely studied in the recent years. The temperature distribution of a sealed vapor cell, which is the crucial component in a DPAL system, produces an important effect on the output performance of a DPAL. In this paper, the strict solution of the heat conduction equation for a cesium vapor cell is obtained by using a finite difference procedure. The temperature distribution of a dummy open cell is first analyzed, and then the temperature distributions of two independent windows, regarded as the boundary conditions of solving a sealed cell, are evaluated in detail. By combining the results of the two steps together, we finally acquire the temperature distribution of a real sealed cesium vapor cell. The results reveal that the temperature gradients on both radial and longitudinal directions change with the pump power, cell radius, and absorption coefficient when the sealed cesium vapor cell is heated or pumped with the laser diodes. The conclusions are helpful for accurately evaluating the output characteristics of a DPAL.

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“…With such obvious advantages, a DPAL provides the outstanding potentiality for realizing a high-powered laser system and becomes one of the most hopeful high-powered laser sources of the next generation. Since the concept of a DPAL was first proposed by W. F. Krupke in Lawrence Livermore National Laboratory in 2001, it has been rapidly developed in the last decade [9][10][11][12][13][14]. The diode-pumped rubidium-vapor laser (DPRVL) is one of three kinds of DPALs [2].…”

Section: Introductionmentioning

confidence: 99%

Investigation of physical features of both static and flowing-gas diode-pumped rubidium vapor lasers

Han¹,

Wang²,

An³

et al. 2014

SPIE Proceedings

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A diode-pumped alkali lasers (DPAL) is a new type of laser source which can offer laser radiation with high efficiency and tiny thermally-induced effects in the near-infrared wavelength region. By constructing a theoretical algorithm through uniting the kinetic, heat transfer, and fluid dynamic procedures together, the thermal features and output characteristics of a DPAL are systematically evaluated for both the static and flowing-gas statuses. The corresponding temperature distributions are calculated for different powers of a pump beam. The results are thought to be useful for realization of a high-powered DPAL in the future.

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

Cited by 10 publications

References 30 publications

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

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

Theoretical study on temperature features of a sealed cesium vapor cell pumped by laser diodes

Investigation of physical features of both static and flowing-gas diode-pumped rubidium vapor lasers

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