Abstract
An intense broadband laser system based on a Nd:glass chirped pulse amplifier (CPA) requires a stable front end with good beam quality. To prepare such a front end without using a regenerative amplifier or optical parametric chirped pulse amplification (OPCPA) pumped by the second harmonic of a Nd:YAG laser, we have developed a fiber CPA system using laser diode (LD)-pumped single-mode fibers, large- mode-area (LMA) fibers, and photonic-crystal (rod) fibers. The output pulse energy achieved was 1.2mJ at a central wavelength of 1053nm with a spectral width of 10 nm. The power fluctuation was reduced to 0.4% rms at a repetition rate of 10kHz. The output of this fiber laser is useful as a pump source for a few-cycle noncollinear optical parametric amplifier (NOPA) and a seed for a LD-pumped high-power Nd:glass CPA system.
Highlights
There has been growing interest in intense femtosecond pulses with durations of less than 10 fs for a variety of applications such as attosecond science using high-order harmonics [1,2,3]
To prepare such a front end without using a regenerative amplifier or optical parametric chirped pulse amplification (OPCPA) pumped by the second harmonic of a Nd:YAG laser, we have developed a fiber chirped pulse amplifier (CPA) system using laser diode (LD)-pumped single-mode fibers, largemode-area (LMA) fibers, and photonic-crystal fibers
The output of this fiber laser is useful as a pump source for a few-cycle noncollinear optical parametric amplifier (NOPA) and a seed for a LD-pumped high-power Nd:glass CPA system
Summary
There has been growing interest in intense femtosecond pulses with durations of less than 10 fs for a variety of applications such as attosecond science using high-order harmonics [1,2,3]. High power femtosecond lasers generally use the method of chirped pulse amplification (CPA) [9] For this purpose, instead of a using a regenerative amplifier or an OPA pumped by the second harmonic of a commercially available Nd:YAG laser, we have developed a high-energy fiber CPA system with a central wavelength of 1053 nm. Instead of a using a regenerative amplifier or an OPA pumped by the second harmonic of a commercially available Nd:YAG laser, we have developed a high-energy fiber CPA system with a central wavelength of 1053 nm This system can be used both as a sub-picosecond pump source for the preamplifier of a NOPA and as a seed pulse for a laser diode (LD)-pumped Nd:glass CPA laser [10], which can be used as a pump source for the main amplifier of an intense few-cycle NOPA laser
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