Typically, an ultrashort pulsed laser is used in the terahertz pulse generation process. Other limits apply to other wavelengths and to ultrashort pulsed lasers. High energy ultrashort pulses can be generated through high harmonic generation in a nonlinear medium. Special types such as regenerative amplifiers and chirped-pulse amplifiers are used to amplify ultrashort pulses. Common current ultrashort pulse laser technologies include Ti-sapphire lasers and dye lasers. Several techniques are available to measure ultrashort optical pulses. Mazur's research continues to focus on ultrashort laser pulse interactions and novel nonlinear optical devices. Subsequently, these lasers were shown to generate ultrashort pulses through Kerr-lens modelocking. It can also be used to compensate for dispersion of ultrashort pulses outside laser cavities. A beamsplitter is used to divide a single ultrashort optical pulse into two separate beams. There is no standard definition of ultrashort pulse. Traditional Hebrew philology considers ultrashort vowels not to be syllable nuclei. The terms "quasi-optical waves" and "ultrashort waves" were used briefly, but did not catch on. The Tiberian tradition possesses three reduced (ultrashort, "hatuf") vowels of which has questionable phonemicity. The ultrashort vowels are slightly more complicated.