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Special laser for gas detection

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introduction：

Temperature controlled pigtail laser series, which adopts DFB laser with quantum well structure, built-in semiconductor cooler, and butterfly pigtail packaging with advanced laser welding technology, is compact in structure and small in size, and widely used in the field of optical fiber communication; Under the high-precision temperature control of semiconductor cooler, the laser has the advantages of high stability of power and wavelength, which makes the laser widely used in the field of optical fiber sensors.

Features:	Applications:
DFB semiconductor laser chip with imported quantum well structure	Optical fiber gas detection system
Wavelength stability	Production inspection of passive components for gas detection
High output power
Gas tight temperature control package
Packaging form: BF14 pigtail type, TF8 space type, TO39 and other customized

Rated limit operating conditions：

Parameters	Symbol	Typical value	Unit
Laser diode forward current	If(LD)	100	mA
Laser diode reverse voltage	Vr(LD)	2	V
Working current of backlight detector	If(PD)	2	mA
Backlight detector reverse voltage	Vr(PD)	20	V
Working current of cooler	ITEC	2.4	A
Working voltage of cooler	VTEC	2.9	V
working temperature	Topr	-20～+70	℃
Storage temperature	Tstg	-40～+85	℃
Lead wire welding temperature/time	Tsld	260/10	℃/s

Technical parameters: (test ambient temperature is 25 ℃)

parameter	Symbol	Test conditions	Min	Typical value	Max	Unit
Output power	PO	CW	3		10	mW
threshold current	Ith	CW	−	12	18	mA
Operating current	Iop	CW, 5mW	-	−	100	mA
working voltage	Vop	CW, 5mW	−	1.5	2.0	V
slope efficiency	η	CW, 5mW	0.05	0.1	−	mW/mA
Peak wavelength	λp	CW, 5mW@25℃	λc-1	λc	λc+1	nm

Wavelength stability	λs	CW，5mW@25℃	-0.1nm		+0.1	dB
Side mode rejection ratio	SMSR	CW, 5mW	35	−	−	nm
Spectral width (20dB)	∆λ	CW, 5mW	−	0.2		nm/℃
Wavelength drift coefficient with temperature change	Δλ/T	Stable operating current		0.1		nm/℃
Wavelength drift coefficient with current	Δλ/I	Stable operating temperature		0.01		nm/mA
Thermistor	Rth	Ttherm=25ºC	9.5	10	10.5	kΩ

pay attention:

In gas detection, according to the absorption spectral line data provided by HITRAN, there are usually several absorption peaks for the same gas. The customer should first select the best central wavelength position according to his system needs.

Gas absorption reference table:

Gas composition	Absorption wavelength
O2	761nm、764nm (VCSEL)
HF	1268.7nm、1273nm、1278nm
H2O	1368.59nm、1392nm
NH3	1512nm
C2H2	1532.68nm
CO	1567nm
H2S	1578nm
Co2	1580nm、2.0um
C2H4	1620nm、1627nm
CH4	1647nm、1650.9nm、1653.7nm、1660nm
HCl	1742nm

Overall dimensions：

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