Difference-frequency generation of 4-μm radiation from Nd:YAG lasers

Wong, S. K.; Oliver, Rachel A.; Schepler, Kenneth L.; Fenimore, D. L.

doi:10.1364/ol.19.001433

Cited by 5 publications

(1 citation statement)

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“…It has been used at any wavelength from near infrared (780 nm) to telecom wavelengths (1310 nm and 1550 nm) up to mid-infrared (2000 nm). In reference [26], the optical damage threshold occurred at a peak intensity of 300 MW/cm 2 . However, the thickness of the crystal was quite thin in the waveguide EOM, the input power of Lithium niobite EOM was usually less than 100 mW.…”

Section: Introductionmentioning

confidence: 99%

Frequency Chirped Intensity Modulated Mid-Infrared Light Source Based on Optical Parametric Oscillation

Yang

Wang

et al. 2020

IEEE Photonics J.

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Optical carried microwave radar (OCMR) has better resistance to turbulence and scattering than conventional laser radar for using intensity modulated laser beam as detection medium. Intensity modulated mid-infrared source is the key to mid-infrared OCMR system. A frequency chirped intensity modulated mid-infrared light source with tunable wavelength is presented. Single frequency output from a non-planar ring oscillator (NPRO) was modulated via a Mach-Zehnder electro-optic modulator (EOM). The modulation frequency was tuned from 10 MHz-2.1 GHz. The modulated light was amplified via a two-stage ytterbium-doped fiber amplifier (YDFA). The amplified 1064 nm laser was used to pump a signal light resonance optical parametric oscillator (OPO). The nonlinear crystal was a 50 mm long magnesium oxide doped periodically-poled lithium niobite (MgO:PPLN) crystal. Single frequency oscillation was realized by adding a 0.2 mm-thick Fabry-Perot (F-P) etalon in the resonator. When the pump power was 15.2 W, the idler output power at mid-infrared was 2.16 W. The maximum pump-idler conversion efficiency was 16.5%. The wavelength of the idler light was tuned from 3.1 μm to 3.8 μm by changing the temperature of the MgO:PPLN crystal. The frequency chirping linearity with respect to time was 0.9937 on average with modulation frequency tuned from 10-350 MHz. The frequency instability was less than 1.5 Hz in 200 seconds at a modulation frequency of 300 MHz.

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Section: Introductionmentioning

confidence: 99%