컬렉션: 1064nm 협대역 통과 필터

Context: This patent describes a Lidar (Light Detection and Ranging) system used for vehicle navigation or topography. It emits pulses of 1064nm light and detects the reflections to calculate distance.

The bandpass filter is used as: A spectral noise eliminator placed in the receiver's optical path, immediately preceding the avalanche photodiode (APD) detector.

Function: Its function is to block broad-spectrum ambient light (such as sunlight and artificial street lighting) while allowing only the narrow 1064nm laser return signal to pass through to the detector.

Result: Achieving a high signal-to-noise ratio (SNR), which enables the Lidar system to detect obstacles accurately even in bright daylight conditions.

Context: This patent involves high-power fiber lasers or amplifiers where a 1064nm signal is generated or amplified. These systems often utilize pump diodes at different wavelengths (e.g., 980nm).

The bandpass filter is used as: An isolation filter (often part of a WDM or isolator assembly) at the output stage of the laser cavity.

Function: It effectively suppresses "Amplified Spontaneous Emission" (ASE) and blocks residual pump light (e.g., 980nm) or other nonlinear harmonics, ensuring only the 1064nm fundamental mode propagates forward.

Result: Achieving a spectrally pure, high-power output beam required for precision telecommunications or material processing applications.

Context: This patent relates to an industrial laser welding system where an Nd:YAG laser (1064nm) is used to melt metal. The system requires real-time monitoring of the weld pool.

The bandpass filter is used as: A "laser line" filter within the machine vision camera assembly that looks at the workpiece.

Function: Depending on the specific configuration, it either (A) blocks the intense thermal radiation and plasma light while passing the 1064nm reflection to monitor laser focus, or (B) blocks the 1064nm laser light while passing visible light to let the camera see the weld pool geometry without being blinded by the laser. (In this specific context of using a 1064nm BP, it is often to track the pilot beam or reflection).

Result: Achieving precise, real-time feedback on the weld quality and laser positioning, reducing defects in automated manufacturing.