2080nm Bandpass Filter (Tm Fiber)

The 2080nm wavelength lies in the near-infrared (NIR) spectrum, exhibiting specific absorption characteristics for water and certain organic molecules while offering moderate tissue-penetrating ability.

Application 1: (Laser Spectral Analysis): Used to precisely isolate 2080nm optical signals, this filter blocks interference from extraneous wavelengths, enabling high-sensitivity detection of hydroxyl-containing compounds in spectroscopic measurements.

Application 2: (Environmental Monitoring): In gas sensing systems, it effectively filters out stray light to ensure the 2080nm wavelength interacts accurately with methane detection modules, enhancing the precision of methane concentration measurements in industrial exhaust.

Application 3: (Medical Optics): Critical for therapeutic devices, it isolates the 2080nm therapeutic beam, enabling safe and targeted use in skin tissue thermotherapy or specialized phototherapy applications by minimizing potential damage from non-target wavelength emissions.

US 9689714 B2 - Multiplexed fiber-coupled Fabry-Perot sensors

Context: A fiber-optic sensing network used to measure strain, temperature, or pressure in harsh environments (like oil wells or bridges) where electronics would fail.

Usage of Filter: The patent describes a Tunable Bandpass Filter that sweeps across a specific range, explicitly citing 1950–2080 nm.

Function: It acts as a Signal Interrogator. The filter rapidly scans the spectrum to identify the specific wavelength of light reflecting back from different sensors along the fiber.

Result: High-precision monitoring. By isolating the 2080 nm signal, the system can read sensors at great distances without interference from the fiber's own noise or other optical signals.

US 7298547 B1 - 2-micron fiber Amplified Spontaneous Emission (ASE) source

Context: A broadband light source used for testing optical components (like lenses and fibers) to see how they behave in the infrared spectrum.

Usage of Filter: The bandpass filter is used to slice the spectrum of a Thulium-Holmium co-doped fiber source.

Function: It acts as a Spectral Shaper. While the light source naturally emits a messy, broad mix of colors from 1700 nm to 2200 nm, the filter forces it to output a clean, stable signal specifically in the 2080 nm region.

Result: Accurate component testing. It creates a reference beam that allows engineers to measure exactly how much light a lens or fiber loses (attenuation) at this specific wavelength.

US 5305414 A - Optical fiber amplifier (Tunable Laser Context)

Context: High-power fiber laser systems used for medical surgery (lithotripsy) or LIDAR.

Usage of Filter: A grating-based bandpass filter is placed inside the laser cavity (the loop where light circulates).

Function: It acts as a Lasing Frequency Selector. Thulium lasers want to lase naturally at 1950 nm. By inserting a filter tuned to 2080 nm, the system suppresses the natural peak and forces the laser to build up power only at 2080 nm.

Result: A wavelength-agile laser. This allows the laser to be "tuned" to 2080 nm, a sweet spot where the atmosphere is relatively transparent but liquid water absorbs energy—perfect for surgical cutting or long-range wind sensing.

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