Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers

George Stewart, Norhana Arsad

Research output: Contribution to journalConference Contribution

1 Citation (Scopus)

Abstract

Fibre laser sources offer interesting possibilities for gas sensors since they can operate over an extended wavelength range, encompassing the near-IR absorption lines of a number of important gases but a major problem is that overtone absorption lines of gases in the near-IR are relatively weak. In order to enhance sensitivity, we present here a simple method of intra-cavity laser absorption spectroscopy (ICLAS) which makes use of the amplified spontaneous emission (ASE) already present within a fibre laser cavity. The ASE also provides a convenient broad-band source for the interrogation of several gases within the gain-bandwidth of the fibre laser. The key principle is based on adjusting the cavity attenuation to select an appropriate inversion level and hence flatten the erbium-fibre gain curve. Under this condition, the ASE undergoes multiple circulations within the fibre laser cavity, enhancing the effective path-length of a gas cell placed within the laser cavity. We have experimentally demonstrated the principle of operation with acetylene gas, using a simple erbium fibre laser system containing a 6cm path-length, fibre coupled, intra-cavity, micro-optic gas cell. For 1% acetylene gas, we have experimentally observed 16 absorption lines in the 1530nm region and a path length enhancement of ~60 has been demonstrated, transforming the 6cm micro-optic cell into an effective path length of ~3.5m. Apart from the OSA, all components are inexpensive and the system is very simple to construct and operate.
Original languageEnglish
Pages (from-to)750312-1 - 750312-4
Number of pages4
JournalProceedings of SPIE: The International Society for Optical Engineering
Volume7503
DOIs
Publication statusPublished - 2009
Event20th International Conference on Optical Fibre Sensors - Edinburgh, United Kingdom
Duration: 5 Oct 2009 → …

Fingerprint

Erbium
Spontaneous emission
Fiber Laser
Fiber lasers
erbium
spontaneous emission
fiber lasers
Spectroscopy
Cavity
Gases
cavities
Path Length
Laser resonators
gases
spectroscopy
Micro-optics
Microoptics
laser cavities
Acetylene
Absorption

Keywords

  • intra-cavity spectroscopy, laser spectroscopy, erbium-doped fibre lasers, fibre sensors, gas sensors

Cite this

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title = "Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers",
abstract = "Fibre laser sources offer interesting possibilities for gas sensors since they can operate over an extended wavelength range, encompassing the near-IR absorption lines of a number of important gases but a major problem is that overtone absorption lines of gases in the near-IR are relatively weak. In order to enhance sensitivity, we present here a simple method of intra-cavity laser absorption spectroscopy (ICLAS) which makes use of the amplified spontaneous emission (ASE) already present within a fibre laser cavity. The ASE also provides a convenient broad-band source for the interrogation of several gases within the gain-bandwidth of the fibre laser. The key principle is based on adjusting the cavity attenuation to select an appropriate inversion level and hence flatten the erbium-fibre gain curve. Under this condition, the ASE undergoes multiple circulations within the fibre laser cavity, enhancing the effective path-length of a gas cell placed within the laser cavity. We have experimentally demonstrated the principle of operation with acetylene gas, using a simple erbium fibre laser system containing a 6cm path-length, fibre coupled, intra-cavity, micro-optic gas cell. For 1{\%} acetylene gas, we have experimentally observed 16 absorption lines in the 1530nm region and a path length enhancement of ~60 has been demonstrated, transforming the 6cm micro-optic cell into an effective path length of ~3.5m. Apart from the OSA, all components are inexpensive and the system is very simple to construct and operate.",
keywords = "intra-cavity spectroscopy, laser spectroscopy, erbium-doped fibre lasers, fibre sensors, gas sensors",
author = "George Stewart and Norhana Arsad",
year = "2009",
doi = "10.1117/12.834330",
language = "English",
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pages = "750312--1 -- 750312--4",
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}

Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers. / Stewart, George; Arsad, Norhana.

In: Proceedings of SPIE: The International Society for Optical Engineering, Vol. 7503, 2009, p. 750312-1 - 750312-4.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers

AU - Stewart, George

AU - Arsad, Norhana

PY - 2009

Y1 - 2009

N2 - Fibre laser sources offer interesting possibilities for gas sensors since they can operate over an extended wavelength range, encompassing the near-IR absorption lines of a number of important gases but a major problem is that overtone absorption lines of gases in the near-IR are relatively weak. In order to enhance sensitivity, we present here a simple method of intra-cavity laser absorption spectroscopy (ICLAS) which makes use of the amplified spontaneous emission (ASE) already present within a fibre laser cavity. The ASE also provides a convenient broad-band source for the interrogation of several gases within the gain-bandwidth of the fibre laser. The key principle is based on adjusting the cavity attenuation to select an appropriate inversion level and hence flatten the erbium-fibre gain curve. Under this condition, the ASE undergoes multiple circulations within the fibre laser cavity, enhancing the effective path-length of a gas cell placed within the laser cavity. We have experimentally demonstrated the principle of operation with acetylene gas, using a simple erbium fibre laser system containing a 6cm path-length, fibre coupled, intra-cavity, micro-optic gas cell. For 1% acetylene gas, we have experimentally observed 16 absorption lines in the 1530nm region and a path length enhancement of ~60 has been demonstrated, transforming the 6cm micro-optic cell into an effective path length of ~3.5m. Apart from the OSA, all components are inexpensive and the system is very simple to construct and operate.

AB - Fibre laser sources offer interesting possibilities for gas sensors since they can operate over an extended wavelength range, encompassing the near-IR absorption lines of a number of important gases but a major problem is that overtone absorption lines of gases in the near-IR are relatively weak. In order to enhance sensitivity, we present here a simple method of intra-cavity laser absorption spectroscopy (ICLAS) which makes use of the amplified spontaneous emission (ASE) already present within a fibre laser cavity. The ASE also provides a convenient broad-band source for the interrogation of several gases within the gain-bandwidth of the fibre laser. The key principle is based on adjusting the cavity attenuation to select an appropriate inversion level and hence flatten the erbium-fibre gain curve. Under this condition, the ASE undergoes multiple circulations within the fibre laser cavity, enhancing the effective path-length of a gas cell placed within the laser cavity. We have experimentally demonstrated the principle of operation with acetylene gas, using a simple erbium fibre laser system containing a 6cm path-length, fibre coupled, intra-cavity, micro-optic gas cell. For 1% acetylene gas, we have experimentally observed 16 absorption lines in the 1530nm region and a path length enhancement of ~60 has been demonstrated, transforming the 6cm micro-optic cell into an effective path length of ~3.5m. Apart from the OSA, all components are inexpensive and the system is very simple to construct and operate.

KW - intra-cavity spectroscopy, laser spectroscopy, erbium-doped fibre lasers, fibre sensors, gas sensors

UR - http://dx.doi.org/10.1117/12.834330

U2 - 10.1117/12.834330

DO - 10.1117/12.834330

M3 - Conference Contribution

VL - 7503

SP - 750312-1 - 750312-4

JO - Proceedings of SPIE

JF - Proceedings of SPIE

SN - 0277-786X

ER -