Directly modulatable laser

US6697394B2 · kind B2 · utility

Assignee

• JENOPTIK LDT GmbH · DE

Inventors

• Andreas Tuennermann · Jena, DE
• Holger Zellmer · Hannover, DE
• Jens-Peter Ruske · Jena, DE

Key dates

• Filing date: Feb 9, 2001
• Grant date: Feb 24, 2004
• Expiry date: Feb 9, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/094
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A directly modulatable laser comprising an active medium inside a laser cavity formed by a resonator mirror and an out-coupling mirror, and a pump light source exciting the active medium. It is characterized in that the active medium generates radiation of two wavelengths (&lgr;1 and &lgr;2) and the resonator mirror is constructed as a controllable reflector by which the reflectivity is controllable for each of the two wavelengths (&lgr;1 and &lgr;2) and the controllable reflector is connected with a control unit, wherein the reflection factor is controlled in such a way that the inversion density of the electrons which is generated in the active medium is constant and the light output of one of the wavelengths ((&lgr;1) is controllable between a minimum value and a maximum value according to an applied control signal, wherein the control of the two wavelengths ((&lgr;1 and &lgr;2) is carried out in push-pull.