Abstract
Abstract A single-frequency pulsed holmium-doped yttrium lithium fluoride (Ho:YLF) amplifier pumped by a Tm-doped fiber laser was demonstrated. The seed was an injection-seeded Q-switched Ho:YLF laser. The output energy from the single-frequency pulsed amplifier was 24.2 mJ, with a pulse width of 250 ns at a pulse repetition frequency (PRF) of 100 Hz. The energy stability during 30 min was improved to 1% after the single-frequency pulsed Ho:YLF laser was amplified. The line width of the single-frequency pulsed spectrum of the Ho:YLF amplifier was 2.81 MHz. The single-frequency pulsed Ho:YLF amplifier can be applied to differential absorption lidar (DIAL), since its output spectrum is around the P12 CO2 absorption line.
Highlights
Narrow-line-width pulsed solid-state lasers in the 2 μm eyesafe spectral region are usually used as the lidar emitter in coherent Doppler lidars for wind field measurement or in differential absorption lidars (DIALs) for monitoring the concentrations of gases such as CO2 and H2O[1,2,3,4]
In this paper we propose a single-frequency single-pass holmium-doped yttrium lithium fluoride (Ho):YLF amplifier around the P12 CO2 absorption line
The line width of the singlefrequency pulsed Ho:YLF amplifier measured by a heterodyne technique was 2.81 MHz
Summary
A Ho-doped single-frequency solid-state laser is a significant means for obtaining a 2 μm narrow-line-width laser that benefits from an insensitivity to temperature, low quantum defects and low upconversion losses[8,9]. The output spectrum of a Ho:YLF laser can be tuned over many CO2 characteristic absorption lines[12,13,14]. The most commonly used CO2 absorption line around the 2050 nm emission peak of Ho:YLF crystal is 2050.967 nm. With a pulse repetition frequency (PRF) of 1.25 kHz, the output energy and pulse width of a single-frequency Ho:YLF laser were 5.5 mJ and 50 ns, respectively. At a PRF of 2 kHz, a maximum single-frequency output energy of 13.5 mJ was obtained, with a pulse width of 42 ns. An output energy of 24.2 mJ with a pulse width of 250 ns at a PRF of 100 Hz was obtained. The line width of the singlefrequency pulsed Ho:YLF amplifier measured by a heterodyne technique was 2.81 MHz
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