Germanium Ge photodiode detector 800-1800nm measurement pulse and continuous fiber light source

Xiaoxiao Photon's germanium photodiodes convert optical power into current, making them an ideal choice for measuring pulse and continuous fiber light sources. The detector is a ceramic with an anode and a cathode. The anode of a photodiode generates a current, which is a function of the incident light power and wavelength. The responsivity R (λ) can be read from the graph on the next page to estimate the amount of photocurrent. By connecting the load resistor (RL) from the anode of the photodiode to circuit ground, current can be converted into voltage. Where P is power, the output voltage is represented by the following equation: bandwidth fBW and rise time response tR are determined by diode capacitance CJ and load resistance RL, as shown below. By applying a bias voltage between the cathode of the photodiode and the circuit ground, the diode capacitance can be reduced.

External cavity high-power helium neon laser 632.8nm discharge tube length 400-2000mm power 9-140mW

This series of external cavity helium neon lasers uses a rod-shaped advanced alloy steel as the longitudinal component of the laser bracket (insulation structure), and an aluminum plate as the shell. The heat generated by the laser tube has little effect on the thermal deformation of the laser bracket for installing the resonant cavity, and the preheating time is short. The aluminum plate shell can keep the laser bracket at a certain temperature and achieve long-term stability of the laser output power. The laser casing is grounded, and there is no static induction or tingling sensation when touching the laser casing by hand. This series of external cavity helium neon lasers has a small volume, light weight, and high output power stability.