The cooling system are indispensable components for high power laser transmitter. The laser system ensures compact, lightweight, energy-saving is a major challenge in laser manufacturing. This paper presents a novel thermal design for our compact high peak power Yb:Er:glass laser. The cooling system is based on thermoelectric cooler with heat dissipation of the TEC’s hot side using vapor chamber, heat sink and fan. The finite element analysis is applied for temperature distribution simulation. The simulation model is calibrated by experiment results to ensure that the error is less than 6%. The laser with cooling system stably operates at the peak power of 1 MW, the repetition rates are tunable from 1 Hz to 20 Hz, and the operation temperature range is from -20 °C to 60 °C.
We fabricated a diode array side-pump, passively Q-switched laser for our laser rangefinder system. The 25 mm linear cavity laser was designed with a rectangular Yb:Er:glass rod as the active element, and a Co:spinel plate as the saturable absorber. The active element was pumped with two quasi-CW 940-nm diode arrays. The pump-to-laser beam overlap was optimized by attaching the Fast Axis Collimator (FAC) lens on the diode arrays. The design for heat transfer from rod surface to the ambient medium is also considered in this report. Our laser operates stably at the wavelength of 1535 nm. The laser pulse energy and pulse width are 1.5 mJ and 4.6 ns, respectively. The repetition rates are tunable from 1 Hz to 10 Hz.
KEYWORDS: Pulse signals, Distance measurement, Laser range finders, Signal detection, Pulsed laser operation, Digital signal processing, Design and modelling, Avalanche photodetectors, Transmitters, Reflection
We fabricated a laser rangefinder for a long range distance measurement. The transmitter is our home-made laser with wavelength of 1535 nm and the peak power of 0.25 MW. The echo pulse laser signals are detected by an avalanche photodiode detector, then the signal is sent to analog to digital circuit board for signal processing. We developed an algorithms based on FPGA to de-noise and improve signal-to-noise ratio. The experimental result shows that our laser rangefinder is capable of measuring distance up to 20 km with false-alarm probability < 1% and the accuracy can reach less than 1 m by range-walk error correction.
We developed a compact, diode-end-pumped, eye-safe laser rangefinder transmitter, which is based on the passively Q-switched Er–Yb:glass laser with a Co:Spinel plate as a saturable absorber (SA). The linear cavity laser considers a concave and a plane mirror with the cavity length is only 20 mm. The repetition rate can be tuned from 1 Hz to 8 Hz at the wavelength of 1535 nm. Our laser system operates stably at peak power > 250 kW and pulse width of 4.5 ns.
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