TDLAS (tunable diode laser absorption spectroscopy) is a laser-based technique used to measure gas concentrations. Among the types of tunable lasers are excimer lasers, gas lasers (such as CO 2 and helium–neon laser lasers), dye lasers (liquid and solid state), transition-metal solid-state lasers, semiconductor crystal and diode lasers, and free-electron lasers. Tunable lasers find applications in. 📦 For purchasing, use the RP Photonics Buyer's Guide for tunable lasers. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. This process generates light, which is then amplified to produce a coherent laser beam. The specific wavelength of the laser depends on the band gap of the semiconductor. By leveraging tunable diode lasers and a synergetic combination of public and private investments and partnerships, the industry can speed development and adoption of photonic integrated circuit (PIC) technologies for the emerging quantum market. It is widely used in industries such as natural gas, petrochemicals, refining, and environmental monitoring, where accurate, real-time gas. Tunable ultra-narrow linewidth external cavity diode lasers can be applied in the field of laser radar, coherent communication, atomic physics.