Peak power is a critical factor for sub-nanosecond-pulsed transmitters utilizing laser diodes (LD) and applied to long distance LIDARs (light detection and ranging) for drones and automotive applications. Receiver speed is not anymore a limiting factor thanks to replacing linear (typically avalanche) detectors and a broad-band amplifier with a single photon avalanche detector (SPAD). Consequently the transmitters become the bottle neck in the resolution and ranging. The simplest and lowest-possible-cost transmitter consists of a switch, an LD, a storage capacitor C, and unavoidable parasitic loop inductance L. In the resulting resonant circuit, the principal problem consists of suppressing relaxation oscillations. Traditional way of oscillation damping reduce peak current and increase the pulse width. Here we show that specific transient properties of a Si avalanche switch solves the problem automatically provided the inductance is sufficiently low. This finding advances the state-of-the-art by reaching 90 W/1ns/200 kHz pulses from a miniature low-cost transmitter based on Si avalanching bipolar junction transistor (ABJT). Besides, the same self-damping effect may be realized in other switches maintaining significant residual voltage despite of fast current reduction.

对于使用激光二极管（LD）的亚纳秒脉冲发射器，峰值功率是至关重要的因素，并已应用于无人机和汽车应用的长距离LIDAR（光检测和测距）。由于用单光子雪崩检测器（SPAD）代替了线性（通常是雪崩）检测器和宽带放大器，因此接收器速度不再是一个限制因素。因此，变送器成为分辨率和范围的瓶颈。最简单，成本最低的发射器包括开关，LD，存储电容器C和不可避免的寄生环路电感L。在最终的谐振电路中，主要问题在于抑制张弛振荡。传统的振荡阻尼方法会降低峰值电流并增加脉冲宽度。在这里，我们表明，只要电感足够低，Si雪崩开关的特定瞬态特性就能自动解决该问题。这一发现使来自基于Si雪崩双极结晶体管（ABJT）的微型低成本发射机的90 W / 1ns / 200 kHz脉冲达到了最新水平。此外，尽管电流迅速减小，但在其他开关中仍可保持相当大的残余电压，也可实现相同的自阻尼效果。