TIA-455-128:1996 (R2014)

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Procedures for Determining Threshold Current of Semiconductor Lasers

Published By	Publication Date	Number of Pages
TIA	1996	22

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Description

Introduction

Intent

Although light emission can occur as soon as current is applied
to the semiconductor laser, it does not emit coherent light until
the current exceeds a critical value, known as the threshold
current. The threshold current is one of the most important
parameters for lasers. This procedure provides standard
.measurement techniques for semiconductor lasers.

This procedure covers the measurement of the threshold current
of semiconductor lasers either as a laser chip placed on a submount
to facilitate handling or as an assembled laser package.

Hazards

This procedure involves potentially hazardous operations as
discussed in this section. During the measurement, a laser will
emit non-visible light. Personnel are strongly cautioned never to
look directly into the laser at anytime. Although the optical
output power is generally not very high, virtually all the power is
concentrated into a narrow frequency band, which implies that the
energy can be focused into a very intense spot on the retina by the
lens within the viewer's eyes.

Additional information