|Table of Contents|

Optimization Analysis of Modulation Parameters in Laser Diode Self-mixing Interferometry Based on Sinusoidal Phase Modulation(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2010年04期
Page:
53-57
Research Field:
物理学
Publishing date:

Info

Title:
Optimization Analysis of Modulation Parameters in Laser Diode Self-mixing Interferometry Based on Sinusoidal Phase Modulation
Author(s):
Guo Dongmei
School of Physics and Technology,Nanjing Normal University,Nanjing 210046,China
Keywords:
m easurem ent;  se l-fm ix ing in terferom etry;  sinuso ida l phasem odulation;  m odulation param eter
PACS:
TN247
DOI:
-
Abstract:
In o rder to im prove the d isp lacem entm easurem ent accuracy o f the se l-f m ix ing interferom eter, s inuso ida l phase m odulating techn ique is introduced to the ana lysis o f se l-fm ix ing inte rference signa.l Phasem odulation is obtained by an e lectro-optic modu lator( EOM ) in the ex terna l cav ity and phase demodu lation is ach ieved by FFT ana lysis m ethod. The e ffect o fm odulation param eter on phase demodu lation is ana ly zed in sinuso ida l phasem odu la ting se l-f m ix ing interferom eter for disp lacem entm easurem en t. A rule fo r se lecting the modu lation param ete r is presen ted. The results of s imu la tion and exper im ents show that: them in imum modu la tion frequency needed to dem odulate the phase is d irectly proportional to the produc t of the am plitude and the frequency o f the exte rnal targ et. When the modu lation am plitude is 1. 23rad, the m easurement error caused by the loss o f po lariza tion is m in imum.

References:

[ 1]W ang W M, Boy leW J O, G ra ttan K T V. Se l-f m ix ing interference in a diode laser: exper im enta l observations and theoret-i ca l ana ly sis[ J]. App lied Optics, 1993, 32( 9): 1 551-1 558.
[ 2]W ang M ing, La iGuangm in. A sel-fm ix ing inte rferom eter us ing an ex terna l dua l cav ity[ J]. M easurement Science and Techno logy, 2003, 14: 1 025-1 031.
[ 3]W ang M ing, LuM in, H ao Hu ,i et a .l Statistics o f the sel-f m ix ing speckle inter fe rence in a laser d iode and its app lication to the m easurem ent o f flow ve loc ity[ J]. Optics Comm un ications, 2006, 260( 1): 242-247.
[ 4]Ov ryn B, Andrew s J H. M easurem ent of changes in optical pa th length and reflectiv ity w ith phase- shifting laser feedback interferom etry[ J] . App lied Optics, 1999, 38( 10): 1 959-1 967.
[ 5]Guo Dongm e,i W ang M ing, Tan Suqing. Sel-fm ix ing inter fe rome ter based on sinuso ida l phase modulating technique [ J]. Optics Express, 2005, 13( 5) : 1 537-1 543.

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Memo:
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Last Update: 2013-04-08