Ultrabroadband infrared pulse ranging from terahertz region to near infrared using air for both generation and detection

Recently, coherent terahertz pulses have been generated through plasma induced by focusing intense two-color ultrashort laser pulses in air. Using hollow-fiber compressed sub-20-fs pulses as the light source, the infrared wave generation and coherent detection up to 70 THz were achieved. We extended the high frequency limit up to 200 THz by using hollow… (More)