Solid-state 589 nm seed laser based on Raman fiber amplifier for sodium wind/temperature lidar in Tibet, China

Abstract

A narrowband sodium lidar for measuring mesospheric temperature and wind has been established at YangBaJing, Tibet (90°E, 30°N, 4300 m a.s.l), China. The system is designed and optimized based on important upgrades using new technology. In the lidar system, single-mode 589 nm seed laser is produced by frequency doubling of 1178 nm diode laser with a periodically poled lithium niobate (PPLN) waveguide. The output power of 589 nm continuous-wave laser is up to 1.5 W with the help of a seed-injected Raman fiber amplifier. Furthermore, fast three-frequency switcher is designed with a couple of fiber magneto optical switches (FMOS) for measuring wind and temperature, simultaneously, which greatly reduces the system maintenance. These improvements greatly simplify the lidar system, thus, achieve robust operation with minimum maintenance requirements.

Measurement of temperature and wind in MLT region over Lanzhou, China based on Na Doppler Lidar

“…Na Doppler lidar requires a three-frequency single-mode pulsed 589 nm laser. Pulsed 589 nm laser with narrow linewidth can be generated by sum-frequency generation (SFG) technique of 1064 nm and 1319 nm pulsed lasers [5][6][7] or pulsed dye amplifier (PDA) injected by 589 nm continuous-wave (CW) seed laser [3,[8][9][10][11] . The 589 nm seed laser can be generated directly by single-mode ring-cavity dye laser [3,8,9,11] or by using nonlinear frequency conversion.…”

“…The 589 nm seed laser can be generated directly by single-mode ring-cavity dye laser [3,8,9,11] or by using nonlinear frequency conversion. Both the SFG technique of 1064 nm and 1319 nm lasers [5][6][7] and the second harmonic generation (SHG) technique of 1178 nm laser can generate 589 nm CW seed laser [10] . The Na Doppler lidar established in LanZhou employed 1178 nm diode laser to obtain 589 nm seed laser based on the technique of Raman fiber amplifier and SHG generation [10] .…”

“…Both the SFG technique of 1064 nm and 1319 nm lasers [5][6][7] and the second harmonic generation (SHG) technique of 1178 nm laser can generate 589 nm CW seed laser [10] . The Na Doppler lidar established in LanZhou employed 1178 nm diode laser to obtain 589 nm seed laser based on the technique of Raman fiber amplifier and SHG generation [10] . In order to emit laser *lidar@apm.ac.cn;lifaquan@apm.ac.cn; phone 027-87197107; fax 027-87198037; pulses with three frequencies switched quickly to obtain the information of Doppler broadening and Doppler shift, an acousto-optic modulation (AOM) unit was usually used.…”

Lidar Technology Based on Fiber System and its Application

“…Finally, the 589 nm CW laser is injected into a pulsed dye amplifier. This system replaced the conventional ring cavity laser and free-space AOM unit [9]. Since the entire optical path adopts the optical fiber mode, less optical path adjustment is required, and the conventional observation operation and daily maintenance became simpler, which can be used in unmanned lidar system.…”

Amplification Characteristics of a Coumarin 460-Based Tunable Amplifier

“…When this technology is applied to laser display, it can provide true wavelength signals with more wavelengths, and greatly simplify the optical path. In addition, organic optical amplifiers are also used in temperature sensors [3], lidars [4], and even cancer treatments [5]. In this experiment, coumarin 460 was used as the working medium of the amplifier.…”