Fiber-Coupled Laser Sources: NIR

SM and PM Sources Available
Minimum Full Output Powers from 1.5 to 25.0 mW
Stable, Low Noise, Constant Power Operation

S1FC808

808 nm, 25.0 mW

Front Panel Display Provides an Enable Button, Laser Power Control, and Display Screen

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Overview
Specs
Pin Diagrams
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Table 1.1 Single Channel Benchtop Laser Sources Selection Guide
Spectrum	Wavelength	TEC	Laser Type	Cavity Type	Output Fiber Type
Visible	405 - 675 nm	No	Semiconductor	Fabry Perot	SM, MM, or PM
Visible	405 - 685 nm	Yes	Semiconductor	Fabry Perot	SM
NIR	785 - 1550 nm	No	Semiconductor	Fabry Perot	SM or PM
	705 - 2000 nm	Yes	Semiconductor	Fabry Perot	SM
	1310 - 1550 nm	Yes	Semiconductor	DFB	SM
	1900 - 2000 nm	N/A	Fiber Laser	Fabry Perot	SM
MIR	2.7 µm	N/A	Fiber Laser	Fabry Perot	SM
Other Fiber-Coupled Laser Sources

Features

SM and PM Available Wavelengths: 785 to 1550 nm
Single Mode or Multimode FC/PC Fiber Interface
Stable, Low Noise, Constant Power Operation
Power Level is Adjustable via Knob and BNC Modulation Input
Interlock Circuit Provided via 2.5 mm Mono Jack

Thorlabs offers single mode and polarization-maintaining fiber-coupled laser sources that emit in the NIR portion of the spectrum. Each benchtop laser source features both a pigtailed Fabry-Perot laser diode and current controller in a single unit.

The front panel of each laser source displays the output power in mW, an on/off key, an enable button, and a knob to adjust the laser power. The back panel includes a BNC input that allows the laser diode drive current to be controlled via an external DC or sine wave voltage source and a remote interlock input.

Please refer to Table 1.1 for all of our single channel benchtop laser sources.

Table 1.2 Key Specifications^a
Item #	S1FC780	S1FC785	S1FC808	S1FC980	S1FC1060	S1FC1550	S1FC780PM	S1FC1310PM	S1FC1550PM
Fiber Type	SM						PM
Wavelength	785 nm	785 nm	808 nm	980 nm	1064 nm	1550 nm	785 nm	1310 nm	1550 nm
Spectrum							-	-	-
Minimum Full Output Power	10.0 mW	20.0 mW	25.0 mW	13.0 mW	20.0 mW	1.5 mW	6.25 mW	1.5 mW	1.5 mW
Power Stability	15 min: ±0.05 dB, 24 hr: ±0.1 dB (After 1 hr Warm-up at 25 ± 10 °C Ambient)

Complete specifications are available in the Specs tab.

Single Mode Source Specifications
Item #		S1FC780	S1FC785	S1FC808	S1FC980	S1FC1060	S1FC1550
Wavelength	Minimum	775 nm	775 nm	798 nm	970 nm	1054 nm	1530 nm
	Typical	785 nm	785 nm	808 nm	980 nm	1064 nm	1550 nm
	Maximum	795 nm	795 nm	818 nm	990 nm	1074 nm	1570 nm
Spectrum^a
Minimum Full Output Power		10.0 mW	20.0 mW	25.0 mW	13.0 mW	20.0 mW	1.5 mW
Setpoint Resolution		0.01 mW	0.1 mW	0.1 mW	0.01 mW	0.1 mW	0.01 mW
Laser Class		3B	3B	3B	3B	3B	1
Fiber
Fiber Type		780HP	780HP	SM800-5.6-125	SM980-5.8-125	HI1060-J9	SMF-28-J9
Mode Field Diameter^b		4.7 - 6.9 µm @ 830 nm	5.0 ± 0.5 µm @ 850 nm	4.7 - 6.9 µm @ 830 nm	5.3 - 6.4 µm @ 980 nm	6.2 ± 0.3 µm @ 1060 nm	10.4 ± 0.5 µm @ 1550 nm
Numerical Aperture		0.10 - 0.14	0.13	0.10 - 0.14	0.13 - 0.15	0.14	0.14
Output Fiber Connector		FC/PC, Wide 2.1 mm Key Compatible
Fiber
Power Stability		15 min: ±0.05 dB, 24 hr: ±0.1 dB (After 1 hr Warm-up at 25 ± 10 °C Ambient)
Display Accuracy		±10%
Adjustment Range		~0 mW to Full Power
Input Power		115 VAC / 230 VAC (Switch Selectable) 50 - 60 Hz
Modulation Input		0 - 5 V = 0 - Full Power, DC or Sine Wave Input Only
Modulation Bandwidth		5 kHz Full Depth of Modulation 30 kHz Small Signal Modulation
Environmental
Operating Temperature		15 to 35 °C
Storage Temperature		0 to 50 °C

Spectral plots are typical, and actual spectra vary from lot to lot. For further information, please contact Tech Support.
Mode Field Diameter (MFD) is specified as a nominal value.

Polarization-Maintaining Source Specifications
Item #	S1FC780PM	S1FC1310PM	S1FC1550PM
Wavelength^a	785 nm	1310 nm	1550 nm
Minimum Full Output Power	6.25 mW	1.5 mW	1.5 mW
Extinction Ratio^a	>20 dB	>23 dB	>23 dB
Stability	15 min: ±0.05 dB, 24 hr:±0.1 dB (After 1 hr Warm-up at 25 ± 10 °C Ambient)
Display Accuracy	±10%
Setpoint Resolution	0.01 mW
Laser Class	3B	1
AdjustmentRange	~0 mW to Full Power
Environmental
Operating Temperature	15 to 35 °C
Storage Temperature	0 to 50 °C
AC Input	115 VAC / 230 VAC (Switch Selectable) 50 - 60 Hz
Modulation Input	0 - 5 V = 0 - Full Power, DC or Sine Wave Input Only
Modulation Bandwidth	5 kHz Full Depth of Modulation 30 kHz Small Signal Modulation
Fiber	PM780-HP	PM1300-HP	PM1550-HP

The information provided in this table is meant to serve as a guideline. However, since each pigtailed laser diode is unique, the specific data is included on a specifications sheet that is shipped with the product.

Modulation In

BNC Female

0 to 5 V Max, 50 Ω

Remote Interlock Input

2.5 mm Mono Phono Jack

2.5 mm Phono Jack

Terminals must be shorted either by included plug or user device, i.e. external switch, for laser mode "ON" to be enabled.

Posted Comments:

Christopher Giranda (posted 2025-05-12 09:49:09.503)

Purchased under PO00182788 8/20/24 Some spurious outputs(noise) wondering about replacement and who to contact about sending inquiries and a loaner unit as it is under warrenty

ksosnowski (posted 2025-05-12 10:56:19.0)

Hello Christopher and thank you for reaching out to us. Optic reflections from debris on the fiber cables are the most common source of noise with these lasers. I recommend to clean your patch cable before every insertion to prevent any damage to the bulkhead of the laser. Backreflections from downstream optics can also destabilize the laser and constant power feedback loop. For issues with performance you can reach out to techsupport@thorlabs.com for help troubleshooting and to evaluate if an RMA is required. I have contacted your directly to discuss this one further.

Jorge Garcia (posted 2025-03-10 19:40:53.903)

I have a question about this model S1FC1550 equipment: the instrument require a periodic traceability calibration to complaint with quality system? Thank you.

ksosnowski (posted 2025-03-11 01:24:06.0)

Hello Jorge, thanks for reaching out to us. We are able to recalibrate the power monitor display if the output power from the fiber bulkhead is not correct. With proper care and handling of the fiber connections, these lasers can last years before losing a significant amount of power. There is no required calibration interval for this product line. I have reached out directly to discuss your application in further detail.

user (posted 2025-02-14 20:57:47.813)

Hello, I've read that you mentioning but the maximum output varies slightly between units. What do you mean by that? For example is it like it operates stable starting from 13 mW and goes up to 1000 mW (1W)? I need the source to go up to 400 mW at least.

cdolbashian (posted 2025-02-14 04:30:17.0)

Thank you for reaching out to us with this inquiry! The value listed on the product page is the nominal at-minimum guaranteed output of the fiber bulkhead. It can be slightly higher (up to a few mW) but will not be lower. We do not have a fiber coupled source which is 1W, unfortunately. I have contacted you directly to share potential other options.

Rawan Semaan (posted 2023-02-22 22:43:54.09)

Hello, I am interested in the Fiber-Coupled Laser Sources: NIR with 980 nm wavelength. it stated that the Minimum Full Output Power is 13.0 mW. What is the maximum power? Does this laser have internal modulation or do we need to modulate it externally? Best regards, Rawan

ksosnowski (posted 2023-03-08 01:51:51.0)

Hello Rawan, thanks for reaching out to Thorlabs. For S1FC980, we guarantee at least a full output power of 13.0mW or more, typically the max full output can be a little higher than this, though it varies slightly between units. The unit can be tuned from 0mW to max output. The power can be adjusted from 0mW to the full output power, using either the control knob or the analog modulation port. This laser does not have an internal frequency generator, but you can apply external DC or sine signals up to 5kHz to modulate the output. I've reached out directly to discuss this application further.

Ben Garber (posted 2020-06-26 19:35:43.303)

I was wondering what constitutes small-signal for the modulation bandwidth of the S1FC980. Specifically, for sine wave modulation, what kind of depth could we expect at 15kHz?

asundararaj (posted 2020-07-07 04:41:55.0)

Thank you for contacting Thorlabs. The small signal modulation amplitude is about 100 mV at 30 kHz, which is about a 2% modulation depth. I have contacted you directly about the performance at 15 kHz.

Single Mode Fiber-Coupled Laser Sources

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Six Wavelengths Available: 785 to 1550 nm
Minimum Full Output Powers of Up to 25.0 mW
Fiber Patch Cables Sold Separately

These Single Mode Fiber-Coupled Laser Sources conveniently package a pigtailed Fabry-Perot laser diode and current controller into a single benchtop unit. The Fabry-Perot laser diode inside each unit is pigtailed to a single mode fiber that is terminated at an FC/PC bulkhead (wide and narrow key compatible) attached to the front panel of the unit. Thorlabs offers single mode fiber optic patch cables for connecting to the bulkhead on the front panel. To minimize losses, we recommend using a fiber patch cable that is the same fiber type as the fiber-pigtailed laser; refer to the Specs tab for the internal fiber type used for the pigtail. Additionally, to reduce noise from back reflections, we recommend that a hybrid FC/PC to FC/APC cable be used with the FC/PC end connected to the laser source.

Also found on the front panel is a display that shows the output power in mW, an on/off key, an enable button, and a knob to adjust the laser power. The back panel includes an input that allows the laser diode drive current to be controlled via an external DC or sine wave voltage source and a remote interlock input.

Note: The laser must be off when connecting or disconnecting fibers from the device, particularly for power levels above 10 mW.

Polarization-Maintaining Fiber-Coupled Laser Sources

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Figure G2.1 S1FC1310PM Shown with PM1300-XP
Polarization-Maintaining Patch Cable

Three Wavelengths Available: 785 nm, 1310 nm, and 1550 nm
Minimum Full Output Powers of Up to 6.25 mW
Fiber Patch Cables Sold Separately
Slow Axis of the PM Fiber Aligned to the Narrow Key of the FC/PC Bulkhead Connector

These Polarization-Maintaining Fiber-Coupled Laser Sources package a pigtailed Fabry-Perot laser diode inside each benchtop unit. The laser diode is pigtailed to a single mode PM fiber that is terminated at an FC/PC bulkhead attached to the front panel of the unit. During the pigtailing process, the fiber alignment is actively maintained so that the polarization axis of the laser diode is aligned with the slow-axis of the PM fiber. In addition, the slow-axis of the PM fiber is aligned to the narrow key of the FC/PC bulkhead connector on the front panel of the benchtop unit. Thorlabs offers polarization-maintaining fiber optic patch cables for connecting to the bulkhead on the front panel. To minimize losses, we recommend using a fiber patch cable that is the same fiber type as the fiber-pigtailed laser; refer to the Specs tab for the internal fiber type used for the pigtail. Additionally, to reduce noise from back reflections, we recommend that a hybrid FC/PC to FC/APC cable be used with the FC/PC end connected to the laser source.

Also found on the front panel is a display that shows the output power in mW, an on / off key, an enable button, and a knob to adjust the laser power. The back panel includes an input that allows the laser diode drive current to be controlled via an external voltage source and a remote interlock input.

Note: The laser must be off when connecting or disconnecting fibers from the device.