Abstract
A CW dual-frequency master oscillator power amplifier (MOPA) laser system with dozens of gigahertz (GHz) frequency separation is presented. The MOPA system consists of a monolithic microchip seed laser and a double-end pumped traveling wave power amplifier. The short length of seed laser cavity guarantees the seed signal with a large frequency separation (above 53 GHz) but low output power (below 247.8 mW). By adding a long and low-doped active medium laser amplifier stage, a significant increase in laser power and an improvement in beam quality are obtained. After fine temperature tuning of seed laser cavity for "spectra matching", a 2.40 W dual-frequency laser signal with 45 GHz frequency separation is achieved.
Highlights
The field of microwave photonics has attracted growing interests worldwide in recent years, with applications such as metrology [1, 2], remote sensing [3], communication systems [4] as well as photonic radio frequency (RF) wave and terahertz (THz) wave generation [5, 6]
Among different architectures of photonic RF wave generation, the adoption of dualfrequency lasers is an interesting way, in which dual frequency signals oscillate in the same cavity for frequency beating
Since the heterodyning efficiency is squarely dependent on the laser intensity, the output power scales of microchip laser brings a limitation to its applicability of photonic RF source
Summary
The field of microwave photonics has attracted growing interests worldwide in recent years, with applications such as metrology [1, 2], remote sensing [3], communication systems [4] as well as photonic radio frequency (RF) wave and terahertz (THz) wave generation [5, 6]. Among different architectures of photonic RF wave generation, the adoption of dualfrequency lasers is an interesting way, in which dual frequency signals oscillate in the same cavity for frequency beating. Since the heterodyning efficiency is squarely dependent on the laser intensity, the output power scales of microchip laser brings a limitation to its applicability of photonic RF source. For pulsed photonic RF and THz source, Q-switched dual-frequency lasers are good solution for heterodyning efficiency enhancement because of their high peak power output. The MOPA systems present an effective way to produce a high average power CW dual-frequency laser, which is very useful for CW photonic RF and THz wave generation.
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