Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-25-26-32948
Timestamp: 2019-04-18 22:29:24+00:00

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We have developed an electronically tuned Cr:ZnSe master oscillator power amplifier with nanosecond pulse operation. The amplifier system produced a broad tuning range from 2.26 to 2.66 μm and an output energy exceeding 50 mJ was obtained over a tuning range of 100 nm. The maximum energy conversion reached 46.6% at a wavelength of 2.41 μm when the pump fluence was 1.4 J/cm2. In addition, we show that Cr:ZnSe is an excellent gain medium for pulsed laser amplifiers to obtain high pulse energy in the broad mid-IR region and high extraction efficiency under low input fluence of 100 mJ/cm2 order.
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Fig. 1 (a) Schematic diagram of the single-stage Cr:ZnSe power amplifier. (b) Schematic diagram of the multi-stage (three-stage) Cr:ZnSe power amplifier.
Fig. 2 Output energy performance of single-stage Cr:ZnSe power amplifier.
Fig. 3 Tuning characteristics of the single-stage Cr:ZnSe power amplifier.
Fig. 4 Output energy extracted from the Cr:ZnSe power amplifiers at each stage.
Fig. 5 Input and output beam profiles of the multi-stage Cr:ZnSe power amplifier. (a) Beam profile input to first stage. (b), (c), and (d) Beam profiles extracted from first, second, and third stages, respectively.
Fig. 6 Output energy extracted from the multi-stage Cr:ZnSe power amplifier and filter tuning curve of the AOTF as a function of wavelength.
Fig. 7 Dependence of extraction efficiency and output energy on input fluence in Cr:ZnSe and Ti:Al2O3 single-pass amplifiers.
Table 1 Optical properties of Cr:ZnSe and Ti:Al2O3.
Optical properties of Cr:ZnSe and Ti:Al2O3.

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