Coherent 2 μm differential absorption and wind lidar with conductively cooled laser and two-axis scanning device

Ishii, Shoken; Mizutani, K.; Fukuoka, Hirotake; Ishikawa, Takayoshi; Baron, Philippe; Iwai, Hironari; Aoki, Tetsuo; Itabe, Toshikazu; Sato, Atsushi; Asai, Keisuke

doi:10.1364/ao.49.001809

Cited by 103 publications

(46 citation statements)

References 25 publications

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“…The LOS wind speeds observed at altitudes below 0.1 km are not used in this analysis because of surface-return contaminations. Laser pulse energy, receiver efficiency, telescope diameter, and other system parameters are based on previous feasibility studies and specifications for a ground-based coherent lidar developed at NICT (Ishii 2009;Ishii et al 2010). The details of DWL parameters are summarized in Table 2.…”

Section: Setup For Numerical Simulationsmentioning

confidence: 99%

Measurement Performance Assessment of Future Space-Borne Doppler Wind Lidar for Numerical Weather Prediction

Ishii

Okamoto

Baron

et al. 2016

SOLA

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Global wind profile observation is important to improve initial conditions for numerical weather prediction (NWP), general circulation model, and various other meteorological studies. A spaceborne Doppler wind lidar (DWL) is one of promising remote sensing techniques for global wind measurement.We describe a study based on simulated satellite measurements for assessing the measurement performances of a Japanese coherent DWL. Global simulations are performed using pseudo-truth atmospheric model of an observing system simulation experiment (OSSE) conducted using the global NWP system of the Japan Meteorological Agency. Wind profile retrieval simulations have been performed for 1 month (August, 2010) and the results show that the percentage of good quality estimates is 40% below 8 km, and it decreases to 10% at 8-20 km in the southern hemisphere and is 20-50% in the northern hemisphere. Expected line-of-sight wind speed errors for good quality estimates are 0.5 m s −1 below 8 km and 1.1 m s −1 at 8-20 km. In the future, the simulated observations will be used in the OSSE to quantitatively infer the potential impacts on NWP accuracy. To illustrate such analysis, results are shown from an initial validation test using a simple wind measurement model instead of the realistic DWL simulations.

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Section: Setup For Numerical Simulationsmentioning

confidence: 99%

Measurement Performance Assessment of Future Space-Borne Doppler Wind Lidar for Numerical Weather Prediction

Ishii

Okamoto

Baron

et al. 2016

SOLA

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“…The development of laser sources in this spectral band, based on radiative transitions in thulium and holmium trivalent cations, Tm 31 and Ho 31 , respectively, is motivated by numerous potential applications in spectroscopy, remote sensing, medicine, tele-communications, and material processing. For example, multiple absorption lines of atmospheric components, such as H 2 O, CO 2 , or NO 2 are exploited in differential absorption lidar (DIAL) systems [1][2][3][4] . The first vibration overtone of the O-H bond in water has an absorption wavelength of 1.92-1.94 mm, which can be used for laser surgery 5 .…”

Section: Introductionmentioning

confidence: 99%

Isolator-free unidirectional thulium-doped fiber laser

Kharitonov

Brès

2015

Light Sci Appl

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We report the first demonstration of a unidirectional, isolator-free 2-mm thulium-doped fiber (TDF) laser, relying on the properties of the theta cavity (ring resonator with S-shaped feedback). The core pumped theta cavity TDF laser provides sub-Watt output power with a slope efficiency of 25%, a 2 dB flat tuning range of 1900-2050 nm, and a linewidth of 0.2 nm, and achieves the extinction ratio of 18-25 dB (depending on the feedback value) between the favored and suppressed lasing directions. It is shown that these characteristics are competitive with, if not superior to, those of conventional ring cavities. The simulation results of the linear and Kerr-nonlinear theta cavities are also presented, explaining certain unexpected features of the laser behavior and establishing the importance of the doped fiber nonlinearity on the spectral shaping of the emitted signal.

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“…Concerning remote sensing, these lasers benefit from an emission in the eye-safe domain to be used as lidar emitter in a differential absorption lidar (DIAL) configuration for remote trace gas monitoring (mainly H 2 O and CO 2 ) or in a coherent lidar for wind detection [1][2][3][4]. In the context of greenhouse gases monitoring such as carbon dioxide (CO 2 ), a powerful emitter in the near infrared (1.5-2 lm) is needed to get a useful precision on concentration measurement (\1 %) with reasonably space and time resolution at a distance of several kilometers.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, high-energy single-mode Q-switched operation in the 2-lm region is achieved with side-pumped Tm,Ho:YLF or Tm,Ho:LuLF lasers [1][2][3][4]. However, the efficiency of these systems is usually limited because of the deleterious effect of upconversion losses at high pump level and reverse transfer between the Tm and Ho ions [11] which produce a large thermal load of the crystal and practically prevent an operation at PRF larger than few tens of Hertz.…”

Section: Introductionmentioning

confidence: 99%

2-μm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application

et al. 2014

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We report on the development and the demonstration of a two-wavelength single-frequency laser oscillator based on Ho:YLF crystal. This laser is especially suitable for application as a transmitter in differential absorption lidar (DIAL)/integrated path differential absorption (IPDA) measurements of atmospheric carbon dioxide (CO 2 ) using the R30 CO 2 absorption line at 2,050.967 nm. The oscillator consists in a fiber-coupled and free-space solid-state hybrid system and can be used in high-energy middle-rate or moderate-energy high-rate configurations. The latter produced On and Off sequentially single-frequency laser pulses with 13 mJ of energy at a repetition rate of 2 kHz and pulse duration of 42 ns. The pulse energy and frequency stabilities are specially documented in free-running, single-frequency and two-frequency seeding single-mode operations. Standard deviation is 7.7 % for pulse energy and 2 MHz for frequency stability for the two-wavelength seeding operation. Allan variance plot shows that frequency fluctuations are reduced below 70 kHz for 10 s of averaging which is suitable for accurate CO 2 DIAL or IPDA measurements.

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Coherent 2 μm differential absorption and wind lidar with conductively cooled laser and two-axis scanning device

Cited by 103 publications

References 25 publications

Measurement Performance Assessment of Future Space-Borne Doppler Wind Lidar for Numerical Weather Prediction

Measurement Performance Assessment of Future Space-Borne Doppler Wind Lidar for Numerical Weather Prediction

Isolator-free unidirectional thulium-doped fiber laser

2-μm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application

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