The LLD1530 Locked-Frequency Laser from Thorlab is a narrow linewidth, DFB-laser-diode-based, turnkey system with a vacuum emission wavelength of 1532.8323 nm and a high SMSR (Side Mode Suppression Ratio) of at least 35 dB. It is an accurate frequency reference designed to provide low-noise laser emission with excellent frequency stability, accuracy, and precision immediately at start-up. This source is ideal for use in demanding FTIR instrumentation, instrument calibration, gas sensing, and coherent telecommunications applications. This frequency reference source can be powered on, frequency locked, and operated over a temperature range from 10 °C to 40 °C.