Multispecies high-energy emitter for CO_2, CH_4, and H_2O monitoring in the 2  μm range

Abstract

We demonstrate the first emitter, based on a single optical source device, capable of addressing three species of interest (CO₂, CH₄, and H₂O) for differential absorption Lidar remote sensing of atmospheric greenhouse gases from space in the 2 μm region. It is based on an amplified nested cavity optical parametric oscillator. The single frequency source shows a total conversion efficiency of 37% and covers the 2.05-2.3 μm range.

Co2 remote detection using a 2-?m dial instrument

“…2(b)). Relative shifting of the signal and idler frequency combs allows Vernier frequency sampling of the emitted single-frequency radiation [3,4]. The NesCOPO radiation is then amplified to the >10 mJ energy level, which is achieved by pre-amplification of the NesCOPO output using a 25 mm long type 0 PPLN crystal, followed by bulk KTP amplifiers.…”

“…Several possible future spatial lidar missions (MERLIN EXCALIBUR ASCENDS) are intended to measure major greenhouse gases (CO 2 , H 2 O, CH 4 ) in order to better understand their cycle and their impact on climate change. One of the challenges of these missions is to get robust sources emitting at least two wavelengths (inside and outside an absorption line of the gas) to perform the differential absorption lidar (DIAL) measurement [1,2].…”

2-μm Coherent DIAL for CO2, H2O and Wind Field Profiling in the Lower Atmosphere: Instrumentation and Results

“…The advantage of such configuration compared to Nd:YAG pumped OPO emitter is (i) the compactness of the system for a given power and (ii) that no stringent characteristic is required for the pump laser, i.e. seeding, pulse repetition frequency (PRF) and beam quality [5,6]. The Ho:YLF oscillator is sequentially seeded by two fiber-coupled Distributed FeedBack laser diodes (DFB) at 2050.97 nm (On-line1) for CO2 or 2050.53 nm (On-line2) for H2O and 2050.26 nm (Off-line) (Fig.…”

Atmospheric CO2 measurements with a 2-μm DIAL instrument

“…In this paper we present long-range absorption measurements on the R30 2-µm absorption line of the CO 2 . The lidar transmitter is based on a nested cavity oscillator (NesCOPO) whose wide tunability in the 1.98 -2.3 µm range allows targeting the three species of interest [5,6].…”