In this regard, the laser information bank was enriched by the novel microlaser design disclosed in the publication of Schauer et al. in Optics Express, where shape-memory polymers were introduced as flexible resonator substrates for continuously tunable organic DFB lasers. The core of the device is a Tecoflex EG-72D shape-memory thermoplastic polymer substrate with second order Bragg surface grating profile and organic semiconductor Alq3:DCM as a laser medium. Mechanical stretching of the substrate, precisely controlled by a thermoelectric unit, changes the grating period by triggering the shape-memory effect. In this way, the DFB grating period can be adjusted to achieve continuous tuning of the single-mode laser emission within a wavelength range of 30 nm between ~600 and 630 nm.
This design of tunable micro-laser can be used for the development of inexpensive and portable spectroscopic and other optically-based analytical tools for individual usage.
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