Monolithic widely tunable quantum cascade laser
2012
Maxion Technologies has designed a monolithic, widely tunable Quantum Cascade (QC) laser for use in chemical
sensing applications. This multi-section QC laser is a monolithically tunable device, similar to those demonstrated in the
near IR for telecommunications. Wideband tuning is achieved through grating assisted coupling of the optical mode
between lateral waveguides, allowing ~10 times the tuning range normally achieved by distributed feedback lasers
without incorporation of external optical elements. Compared to implementations in the near IR, the use of lateral
waveguides (rather than vertically stacked waveguides) allows the optical mode to maintain the high overlap with the
active region necessary for room temperature lasing in the mid-IR. Due to its monolithic design, this laser is expected to
be rapidly tunable and usable in field environments due to its insensitivity to shock and vibration, while the wide tuning
range of the device will allow for an enhanced ability to discriminate against background chemicals.
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