Scalable collinear BiB3O6 OPA for few-cycle CEP stable pulses at 2.1 µm

Few-cycle pulses centered at long wavelengths with stable carrier envelope phase are increasingly sought after for a range of strong-field physics and spectroscopic applications. The generation of such pulses at central wavelengths up to 1.8 µm is well-known [1], however at longer wavelengths non-collinear optical parametric amplifiers must be used to maintain bandwidth. Using the idler from such a non-collinear interaction always implies an angularly dispersed pulse, requiring complicated and lossy compensation strategies [2] which limit scalability to higher energies.