Coherent lidar airborne wind sensor II: flight-test results at 2 and 10 μm

Targ, Russell; Steakley, Bruce; Hawley, James G.; Ames, Lawrence L.; Forney, P. B.; Swanson, David A.; Stone, Richard E.; Otto, Robert G.; Zarifis, Vassilis; Brockman, P.; Calloway, Raymond S.; Klein, Sarah; Robinson, P.

doi:10.1364/ao.35.007117

Cited by 130 publications

(31 citation statements)

References 6 publications

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“…Broadly spectral region ultrafast 2 μm lasers have many applications in remote sensing, optical coherence tomography, laser comb generation in the near-IR and pump sources for mid-infrared (mid-IR) optical parametric oscillators [1,2]. 2 μm lasers based on thulium (Tm) ions have become prominent in recent years.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide absorber for 2 µm passive mode-locking Tm:YAlO3 laser

et al. 2011

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For the first time of our knowledge, we demonstrate the graphene oxide as a saturable absorber (SA) in the passive mode-locking of a diode pumped Tm 3+ -doped laser. Broadly spectral region sub-10 ps mode-locking in a Tm:YAlO3 (Tm:YAP) laser near 2 µm were obtained. With a pump power of 8.64 W, the average output power of 268 mW with the maximum pulse energy of 3.7 nJ at the pulse repetition frequency (PRF) of 71.8 MHz was obtained.

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Section: Introductionmentioning

confidence: 99%

Graphene oxide absorber for 2 µm passive mode-locking Tm:YAlO3 laser

et al. 2011

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“…Such systems were previously developed for short-range sounding (Schmitt et al, 2007;Jentink and Bogue, 2005). Medium-range lidars have recently been developed, built, and tested (Huffaker and Hardesty, 1996;Inokuchi et al, 2009a, b;Veerman et al, 2014;Vrancken et al, 2016;Targ et al, 1996;Thales Avionics and ONERA, 2004). One of these systems was developed in the framework of the DELICAT project (DEmonstration of LIdar-based Clear Air Turbulence detection) (Veerman et al, 2014;Vrancken et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Impact of pitch angle fluctuations on airborne lidar forward sensing along the flight direction

Gurvich

Куликов

2017

Atmos. Meas. Tech.

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Abstract. Airborne lidar forward sensing along the flight direction can serve for notification of clear air turbulence (CAT) and help to prevent injuries or fatal air accidents. The validation of this concept was presented in the framework of the DELICAT (DEmonstration of LIdar-based CAT detection) project. However, the strong variations in signal level, which were observed during the DELICAT measurements but not explained, sometimes indicated the need of a better understanding the observational errors due to geometrical factors. In this paper, we discuss possible error sources pertinent to this technique, related to fluctuations of the flight parameters, which may lead to strong signal variations caused by the random deviations of the sensing beam from the forward flight trajectory. We analyze the variations in backscattered lidar signal caused by fluctuations of the most important forward-sensing flight parameter, the pitch angle. The fluctuation values considered in the paper correspond to the error limits of the compensational gyro platform used in civil aviation. The part of the pitch angle fluctuations not compensated for by the beam-steering device in the presence of aerosol concentration variations can lead to noticeable signal variations that can be mistakenly attributed to wind shear, turbulence, or fast evolution of the aerosol layer. We formulate the criteria that allow the recognition of signal variations caused by pitch angle fluctuations. Influence of these fluctuations is shown to be stronger for aerosol variations on smaller vertical scales. An example of DELICAT observations indicating a noticeable pitch angle fluctuation impact is presented.

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“…Solid-state pulsed nanosecond 2 lm lasers are of great interests for their diverse applications in scientific and application fields, such as molecular spectroscopy (Smolski et al 2014), carbon dioxide (CO 2 ) detection (Koch et al 2004), atmospheric communication (Targ et al 1996), medical diagnostics as well as manufacture industry (Petrich 2001). Besides, 2 lm lasers are also efficient pump sources for mid-infrared (mid-IR) optical parametric oscillators (OPOs) emitting at 3-5 and 8-12 lm (Budni et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Highly efficient passively Q-switched solid-state 2 μm laser with monolayer Graphene

et al. 2015

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By using monolayer graphene as saturable absorber, a passively Q-switched Tm:LuAG laser with high efficiency at 2 lm is demonstrated. At the incident pump power of 5.8 W, pulses with duration of 235 ns and maximum average output power of 873 mW were obtained at a repetition rate of 72 kHz. This is, to the best of our knowledge, the highest average output power, as well as the narrowest pulse width, ever obtained among graphene-based passively Q-switched solid-state bulk lasers at 2 lm regime.

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Coherent lidar airborne wind sensor II: flight-test results at 2 and 10 μm

Cited by 130 publications

References 6 publications

Graphene oxide absorber for 2 µm passive mode-locking Tm:YAlO3 laser

Graphene oxide absorber for 2 µm passive mode-locking Tm:YAlO3 laser

Impact of pitch angle fluctuations on airborne lidar forward sensing along the flight direction

Highly efficient passively Q-switched solid-state 2 μm laser with monolayer Graphene

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