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To achieve ultra-short, sub-50 fs optical pulses around 2 μm using a novel mixed Tm,Ho:CaYGdLuAlO4 crystal with broad emission properties.

43 fs pulse generation from a SESAM mode-locked Tm,Ho:CALYGLO laser

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To achieve ultra-short, sub-50 fs optical pulses around 2 μm using a novel mixed Tm,Ho:CaYGdLuAlO4 crystal with broad emission properties.
Employed a novel disordered 'mixed' crystal (Tm,Ho:CaYGdLuAlO4) offering structural and compositional disorder for broad emission spectra.
Used a semiconductor saturable absorber mirror (SESAM) to passively mode-lock the laser cavity.
Enhanced self-phase modulation (SPM) effects within the laser setup to compress pulse durations at σ-polarization.
Generated sub-50 fs pulses operating near 2 μm wavelengths.
Achieved optical pulses as short as 43 fs centered at 2080 nm with σ-polarization.
Obtained a wide spectral bandwidth of 114 nm, demonstrating feasibility for few-optical-cycle pulse generation.

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Experimental study demonstrates 43 fs pulses in a mixed aluminate crystal laser, highlighting its potential for few-cycle 2-μm pulse generation.

Zhang et al. (2025) studied this question.

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Experimental study demonstrates 43 fs pulses in a mixed aluminate crystal laser, highlighting its potential for few-cycle 2-μm pulse generation.