Abstract
Using semiconductor saturable absorbers, we passively mode lock two color center lasers (CCL) to generate femtosecond pulses at wavelengths within the gain band of erbium-doped fiber amplifiers. For the first time to our knowledge, we passively mode lock a KCl, FA(Tl) CCL in a single cavity to generate near transform limited Gaussian pulses as short as 315 fs with pulse energies up to 600 pJ. We also extend the tuning range for a NaCl, (F 2+)H CCL to include the 1.5–1.6 μm wavelength range and generate pulses as short as 280 fs by addition of a low-loss intracavity prism filter and proper crystal preparation. The performance of the two lasers are compared as a function of wavelength.
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