Self-aligned non-dispersive external cavity tunable laser

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We have experimentally demonstrated a self-aligned tunable External Cavity Laser based on volume (thick) holographic reflection gratings. Tunable single frequency operation has been achieved at 405 nm and 785 nm over 1 nm. Tuning high power broad area lasers has also been demonstrated with a 1 nm spectral range and bandwidth narrowing from 4 nm to 0.2 nm. The effective cavity length of the ECL is approximately twice the physical length of the ECL by construction. Because the resulting linewidth of the ECL is inversely proportional to the square of the cavity length [14], the linewidth is decreased by a factor four compared with an ECL of similar physical length.