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SBIR/STTR

Pulsed, Single-Frequency, 2-um Seed Source for Coherent LIDAR Applications, Phase II

Completed Technology Project

Project Introduction

Pulsed, Single-Frequency, 2-um Seed Source for Coherent LIDAR Applications, Phase II
The primary objective of the proposed Phase II effort is to develop and deliver a ruggedized, single-frequency, mJ-level, 2050-nm master oscillator power amplifier system suitable for coherent LIDAR applications. The laser system is based on a low-average power, pulsed, single-frequency, 2-um Ho-laser source. Pulsed operation of the Ho-oscillator is achieved via passive Q-switching using robust Cr2+-doped saturable absorbers. Development of such pulsed seed sources enables the design of compact, rugged, reliable and efficient LIDAR transmitters based on all-amplifier architecture. Direct diode-pumping using the latest 1.9-um diode laser technology provides improved oscillator reliability and compactness. Efficient, Tm:fiber laser pumped, bulk Ho:YLF single-stage amplifier provides energy scaling to mJ level. The choice of a 2-um Ho-laser material (as opposed to 1.5-um Er-lasers) enables efficient power/energy scaling of the pulsed seed oscillator output in high-gain Ho-amplifiers. This approach decreases the number of amplifying stages, simplifies the overall design and packaging, and improves the electrical efficiency of the complete laser system as compared to the current technology. More »

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