This document introduces the features and characteristics of the Sony SLD238VL M-274 M-274 Index-Guided High Power AlGaAs Laser Diode, including power, current, angle, etc.
The Sony SLD238VL is an index‑guided high‑power AlGaAs laser diode intended for optical pickup applications such as CD‑R/RW. This datasheet describes its structure, key features, and recommended operating conditions.
Typical specifications include a threshold current of 23 mA, operating current up to 140 mA, wavelength range 779‑789 nm, and a maximum optical output of 100 mW CW (150 mW pulsed). Safety notes cover Class 3B laser classification, eye‑protection requirements, and precautions against electrostatic discharge and surge currents.
| Threshold current (Ith) | 23‑40 mA |
|---|---|
| Operating current (Iop) | 100‑140 mA |
| Operating voltage (Vop) | 2.0‑2.3 V |
| Wavelength | 779‑789 nm |
| Differential efficiency | 0.7‑1.3 mW/W/mA |
| Radiation parallel angle | 7.4‑9.8 deg |
| Radiation perpendicular angle | 14.0‑19.0 deg |
| Recommended optical power output | 90 mW |
| Maximum optical power output (CW) | 100 mW |
| Maximum optical power output (Pulse) | 150 mW |
| Pulse width | ≤ 200 ns |
| Duty cycle | ≤ 50 % |
| Reverse voltage (VR LD) | 2 V |
| Operating temperature range | -10 °C to +70 °C (pulse) |
| Storage temperature range | -40 °C to +85 °C |
The absolute maximum optical power output is 100 mW in continuous wave mode and 150 mW in pulse mode.
Avoid direct eye exposure, always wear laser‑blocking safety goggles, and protect the device from electrostatic discharge and surge currents.
The device is rated for an operating temperature from –10 °C to +70 °C (pulse operation).