Browse Prior Art Database

RING CAVITY FREQUENCY DOUBLING ARRANGEMENT

IP.com Disclosure Number: IPCOM000023613D
Original Publication Date: 1978-Jun-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 245K

Publishing Venue

Xerox Disclosure Journal

Abstract

The conversion efficiency of a frequency doubler can rise dramatically if both fundamental and harmonic wavelengths are resonant in a cavity. Izj a linear cavity, two problems arise: The harmonic output of an efficient cavity comes out from the entrance for the fundamental. The phase relationship between fundamental and harmonic after reflection will not be ideal unless a very special profile is maintained for the reflection gratings.

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XEROX DISCLOSURE JOURNAL

RING CAVITY FREQUENCY DOUBLING Proposed Classification

ARRANGEMENT U.S. Cl. 33l/94.5C
H. Rokos Int. Cl. HOls 3/00

I 4

III UI

INPUT -*1

. Wt,tt4 J

$115 + INPUT FRCQUENCY

The conversion efficiency of a frequency doubler can rise
dramatically if both fundamental and harmonic wavelengths are
resonant in a cavity. Izj a linear cavity, two problems arise:
The harmonic output of an efficient cavity comes out from the
entrance for the fundamental. The phase relationship between
fundamental and harmonic after reflection will not be ideal
unless a very special profile is maintained for the reflection
gratings.

A ring cavity as shown can solve both these problems. The ring
cavity consists of a pair of parallel linear guides separated
by a sufficient amount to keep cross coupling adequately low.
These guides are designed so that, at some suitable temper-
ature, phase match is maintained between fundamental and
harmonic. Gratings are impressed on each guide, and the
separation is arranged so that the phase match is re-
established at the grating outputs (the relative phases may
have gone through several cycles on the passage between the
guides). All gratings except the input are designed for
maximum cross-coupling, and the SHG output emerges at an angle
to the input.

This is a method of providing low cost, green/blue output from
*red laser.

Volume 3 Number 3 May/June 1978 183

LI

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                   XEROX DISCLOSURE JOURNAL
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