The **LU974C-R** is a specialized electronic component, primarily recognized as a **high-power semiconductor laser diode** module. It is frequently used in telecommunications and industrial fiber laser applications as a "pump" source. --- ## 1. Core Technical Specifications The LU974C-R is designed for high reliability and efficiency. Below are its typical operating parameters: | Feature | Specification (Typical) | | :--- | :--- | | **Center Wavelength** | 974 nm (Nanometers) | | **Output Power** | 200mW - 600mW (depending on specific bin) | | **Fiber Type** | Polarization Maintaining (PM) Fiber | | **Package Type** | 14-pin Butterfly Package | | **Operating Current** | 400mA - 1000mA | | **Spectral Width** | < 1 nm (with FBG stabilization) | --- ## 2. Key Internal Components The "Butterfly" package of the LU974C-R contains more than just the laser chip. It is a complex opto-electronic assembly: ### A. The Laser Diode Chip The heart of the module is a Gallium Arsenide (GaAs) based semiconductor that emits light at the 974nm infrared spectrum when forward-biased. ### B. Thermoelectric Cooler (TEC) Because laser wavelength and lifespan are highly sensitive to heat, the module includes an internal **Peltier cooler**. This allows the user to maintain a constant chip temperature regardless of external conditions. ### C. Thermistor A high-precision resistor that changes resistance based on temperature. The system uses this to monitor the chip's heat and provide feedback to the TEC controller. ### D. Fiber Bragg Grating (FBG) The "R" in the suffix often denotes a **Reflector** or **Grating**. The fiber pigtail usually contains an FBG, which acts as a filter to "lock" the laser to exactly 974nm, preventing wavelength drift. --- ## 3. Pinout Configuration (Standard 14-Pin) Most LU974C-R modules follow a standard butterfly pinout to ensure compatibility with laser drivers: | Pin | Function | Description | | :--- | :--- | :--- | | **1** | TEC (+) | Positive terminal for the cooler | | **2** | Thermistor | Temperature sensor lead | | **5** | Thermistor | Temperature sensor lead | | **8/9** | PD (+) / (-) | Monitor Photodiode (measures light output) | | **11** | LD (-) | Laser Diode Cathode | | **12** | LD (+) | Laser Diode Anode | | **14** | TEC (-) | Negative terminal for the cooler | --- ## 4. Primary Applications * **EDFA Pumping:** Used in Erbium-Doped Fiber Amplifiers to boost optical signals in long-distance internet cables. * **Fiber Lasers:** Acts as a seed or pump source for larger industrial laser systems. * **Instrumentation:** Used in high-precision laboratory light sources. ---