Abstract
Yb:CALGO bulk oscillator generating ultrashort pulses at high efficiency by cross-polarized optical pumping
Highlights
Numerous applications rely on transform-limited few-cycle laser pulses and are typically based on green-pumped Ti:sapphire laser oscillators [1,2]
We show that we can overcome these spectral and power limitations by using a novel pump mirror design relying on cross-polarized optical pumping
The developed pump mirror is highly transmissive for the pump light in p-polarization, while it is highly reflective for the laser light in s-polarization, even covering the pump wavelength and beyond [Fig. 1a)]
Summary
Numerous applications rely on transform-limited few-cycle laser pulses and are typically based on green-pumped Ti:sapphire laser oscillators [1,2]. Simple and cost-efficient Yb-doped bulk laser oscillators are a promising alternative, but have so far been severely limited in power and efficiency for operation in the sub-30-fs regime [3,4]. Standard colinearly-pumped Yb-doped bulk laser oscillators use dichroic pump mirrors with a high transmission for the pump at around 980 nm and a high reflectivity at the lasing wavelengths [Fig. 1a)].
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