Browse Prior Art Database

Diode Laser Array Phase Conjugate Resonator for Printer Applications

IP.com Disclosure Number: IPCOM000034593D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Arjavalingam, G: AUTHOR [+3]

Abstract

Disclosed is a technique to improve the beam characteristics of a diode laser array by incorporating a phase conjugate resonator using a photorefractive crystal. A GaAs crystal would be ideal since the entire device could then be integrated on a single wafer. It has been shown recently that photorefractive crystals, especially GaAs, have tremendous technological potential [1]. They have been used to obtain four-wave mixing at diode laser wavelengths [2]. The extension of four-wave mixing to obtain a phase conjugate beam is trivial. It is well known that a laser resonator having at least one conventional mirror replaced by a phase conjugate mirror (PCM) exhibits many interesting properties [3].

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Diode Laser Array Phase Conjugate Resonator for Printer Applications

Disclosed is a technique to improve the beam characteristics of a diode laser array by incorporating a phase conjugate resonator using a photorefractive crystal. A GaAs crystal would be ideal since the entire device could then be integrated on a single wafer. It has been shown recently that photorefractive crystals, especially GaAs, have tremendous technological potential [1]. They have been used to obtain four-wave mixing at diode laser wavelengths [2]. The extension of four-wave mixing to obtain a phase conjugate beam is trivial. It is well known that a laser resonator having at least one conventional mirror replaced by a phase conjugate mirror (PCM) exhibits many interesting properties [3]. In addition to its ability to correct the intra-cavity phase distortions, such a resonator also locks onto the frequency of the pump laser. This feature is particularly useful for printer applications since the various facets of a diode laser array are known to have wavelength differences.

Such wavelength differences are undesirable when the beams are focussed onto the photoconductor. Our invention incorporates a GaAs crystal as a phase conjugator pumped by a high powered, frequency stabilized diode laser, as shown in Fig. 1. This conjugator forms one end of the resonator for a diode laser array. Each of the lasers in this array has a partially reflecting back mirror and a phase conjugating front mirror. A part of the pump beam is...