Terahertz Frequency Comb Generator

Terahertz frequencies have long promised to transform communications and sensing but are very challenging to source.

Terahertz frequency comb generator.

Several approaches have been developed including frequency interval bisections 5 optical parametric oscillations 6 optical comb generations 7 8 and frequency division by three 9 an optical frequency comb ofc generator is a sim ple system that uses only one. A femtosecond mode locked fs ml laser generates a sequence of pulses that are essentially copies of the same pulse separated by an interval equal to the inverse of the mode locked frequency f rep yasui et al 2011a the highly stable fs ml pulse train is synthesized by a series of. Bridge wide frequency intervals usually more than a few terahertz phase coherently. By harnessing a recently discovered laser state seas researchers have discovered an infrared frequency comb in a quantum cascade laser that offers a new way to generate terahertz frequencies.

Highly selective terahertz optical frequency comb generator. Ye j ma ls daly t hall jl. Figure 15 1 illustrates the principles of an optical comb and a thz comb in the time and frequency domains. The terahertz laser is locked by a terahertz injection phase lock loop for the first time with the terahertz signal generated by heterodyning selected lines from an all fiber infrared frequency comb generator in an ultrafast photodetector.

Frequency combs based on terahertz quantum cascade lasers which combine the high power of lasers with the broadband capabilities of pulsed sources are demonstrated. We clearly observed beat signals between the terahertz source and the optical two tone extracted. The frequency combs generate. Using a 10 5 ghz resonant electro optic modulator placed inside a resonant optical cavity we generated an optical frequency comb with a span wider than 3 thz.

Terahertz optical comb generator researchers at jila university of colorado national institute of standards and technology and new focus have used a prototype model 4851 that resonated at 10 5 ghz to generate a spectrum of sidebands over 3 thz wide around a stabilized 633 nm hene laser source that s over 250 sidebands at 10 5 ghz. Internally it is a resonant electro optic modulator with the capability of generating hundreds of sidebands with total span of at least 3 terahertz limited by the optical dispersion of the lithium niobate crystal and frequency spacing of 17 ghz. Researchers at the universidad carlos iii of madrid uc3m and the firm luz wavelabs are developing an innovative terahertz generator that improves signal quality by one million times as compared.