Abstract

Frequency combs with gigahertz spacing offer more power per mode and a smaller resolution is required to access the individual optical lines than in case of the usual megahertz spacing. Therefore they are auspicious for various applications, such as calibration of astronomical spectrometers, waveform synthesis, stable microwave generation, and optical clocks [1]. Frequency combs from diode-pumped solid-state lasers (DPSSLs) are advantageous because DPSSLs are reliable, compact, low cost and have a low quantum noise level because of the high-Q cavity operation. The challenge at high repetition rates is to obtain enough peak power to generate a coherent octave-spanning spectrum required for the detection of the carrier envelope offset (CEO) frequency with the standard f-to-2f interferometer approach [2].

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