High-average-power, high-duty-cycle (λ∼6 μm) quantum cascade lasers (original) (raw)
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Abstract
High-power quantum cascade lasers emitting at λ=6.1 μm are demonstrated. Accurate control of growth parameters and strain balancing results in a near-perfect lattice match, which leads to excellent material quality. Excellent peak power for uncoated lasers, up to 1.5 W per facet for a 21 μm emitter width, is obtained at 300 K for 30 period structures. The threshold current density at 300 K is only 2.4 kA/cm2. From 300 to 425 K, the laser exhibits a characteristic temperature T0 of 167 K. Next, Y2O3/Ti/Au mirror coatings were deposited on 1.5 mm cavities and mounted epilayer down. These lasers show an average output power of up to 225 mW at 17% duty cycle, and still show 8 mW average power at 45% duty cycle.
Publication:
Applied Physics Letters
Pub Date:
December 2002
DOI:
Bibcode:
Keywords:
- 42.55.Px;
- 85.35.Be;
- 42.60.Da;
- 42.60.By;
- Semiconductor lasers;
- laser diodes;
- Quantum well devices;
- Resonators cavities amplifiers arrays and rings;
- Design of specific laser systems