Request Price Ships: 4 weeks | Model AMN-LiDAR-05
- Designed for Wind Detection, 3 Dimensional Imaging and Ranging LiDAR Systems
- Pulse Energy up to 150 μJ @ 200 Nanosecond Pulse Width, Linear Polarized Nanosecond Pulsed all Fiber Laser Source with Master-Oscillator Power Amplifier
- Integrated AOM
- Pulse Widths from 100 to 1,500 nanoseconds
- Pulse Repetition Rate from 10 to 20 kHz
- Ultra-Narrow Linewidth as Narrow as 1.6 kHz
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|GENERAL (SEED MOdule and Amplifier Module)|
These 1550nm Fiber Lasers for LiDAR applications are ultra-high stability, high output power narrow linewidth light sources offering single mode, linear polarized nanosecond pulsed all fiber laser source with a master oscillator power amplifier. These units are designed for three dimensional imaging, wind detection and ranging LiDAR systems. No post installation service is required for these versatile, ready-to-use and durable laser sources designed specifically for various LiDAR applications.
LiDAR 1550nm Fiber Laser Configuration:
These narrow linewidth all PM fiber based nano-second pulsed lasers are based on a MOPA master oscillator power amplifier design. The nanosecond fiber laser system consists of two compact modules: 1) the seed laser module and 2) the power amplifier module. In the seed laser module, a CW 15 kHz single mode diode laser with eye-safe operation at 1550nm emission is utilized. This narrow linewidth enables a very long coherence length over over 20 killometers. This long coherence length makes these seed sources an excellent choice for long distance LiDAR applications. The seed laser is split by an optical couple. One milliwatt of the output power splits to an FC/APC receptacle as a local oscillator, while the seed laser from the other output of the optical coupler is connected to an acoustic optical modulator to generate a pulse train with 100 to 1,000 nanosecond pulse widths at a 10 kHz ~ 20 kHz rep. rate. The acoustic optical modulator serves two purposes. First, it is an ultra-high extinction ratio (>100 dB) optical pulse generator. Second, it is a frequency shifter (+80MHz) for doppler detection. A pre-amp PM fiber amplifier is used to compensate AOM insertion loss and boost the pulse energy. The pulse train then goes to the power amplifier module.
1550nm Nanosecond Fiber Laser Power Amplifier Module:
The power amplifier module consists of a multi-stage amplifier. At each stage of amplification, fibers with increasing mode-field diameter are used to minimize inherent nonlinear effects. The largest nonlinear effect for the system is stimulated Brillouin scattering. This effect arises from the interaction between optical field and acoustic photons in the fiber. This effect limits the maximum output power and can also damage the laser components in the optical path. Suppression of SBS generation is a key factor in the design of these laser systems.
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