Post holder and post not included

Features

• Si-PIN and InGaAs-PIN photodiodes
• Wavelength range from 320 to 1700 nm
• Bandwidth from DC to 400 kHz
• Transimpedance gain  10⁷ V/A
• Min. NEP 75 fW/√Hz

 

A New Family of Photoreceivers

By combining state of the art photodiodes with the proven and outstanding FEMTO LCA Current Amplifier technology we designed a new family of photoreceivers with a remarkable performance. The LCA-S-400K is available with either a large area Si or InGaAs photodiode covering a spectral range from 320 to 1060 nm and 900 to 1700 nm, respectively. The amplifier transimpedance is 10⁷ V/A resulting in a maximum conversion gain of 9.5 x 10⁶ V/W at 1550 nm for the InGaAs model.
Thanks to the very low-noise behavior of the transimpedance amplifier, the minimum NEP is only 75 fW/√Hz. This facilitates detection of optical signals in the 100 pW range without additional measures such as averaging or similar, and all this with a bandwidth of 400 kHz.

 

COMPATIBLE WITH OPTICAL BENCH (FREE SPACE) AND FIBER OPTICS

The free space input is designed as a 1.035"-40 threaded flange with a screw-on coupler ring (FST) or as a 25 mm round flange without thread (FS). Both types open up broad compatibility with optical accessories from various manufacturers, such as lenses, tubes, cage systems, optical adapters etc.

The FST free-space input can be converted into fiber connections (FC, FSMA) easily by simply screwing on the fiber adapter of the PRA series.

The relatively large-area detector facilitates optical focusing in free-space applications and ensures a high and stable degree of coupling when using the optionally available fiber optic adapter.

	FST		FS
	Pic. 1: FST input flange with 1.035"-40 external thread and coupler ring with internal thread		Pic. 2: FS input with 25 mm round flange

 
All LCA-S photo receivers are equipped with UNC 8-32 and M4 threaded holes and can therefore be conveniently and stably integrated into optical systems on standard rod holders. The optionally available adapter plate PRA-PAP opens up further mounting options.

Applications

• Spectroscopy
• General purposes opto-electronic measurements
• Optical front-end for oscilloscopes, A/D converters and lock-in amplifiers

 

Models	LCA-S-400K-SI-FST LCA-S-400K-SI-FS	LCA-S-400K-IN-FST LCA-S-400K-IN-FS
Photodiode	3.0 mm Ø Si-PIN	0.5 mm Ø InGaAs-PIN
Spectral Range	320 – 1060 nm	900 – 1700 nm
Bandwidth (-3 dB)	DC – 400 kHz	DC – 400 kHz
Rise/Fall Time (10% - 90%)	900 ns	1 µs
Transimpedance Gain	1 x 107 V/A	1 x 107 V/A
Max. Conversion Gain	5.9 x 106 V/W (@ 920 nm)	9.5 x 106 V/W (@ 1550 nm)
Min NEP (@ 10 kHz)	120 fW/√Hz (@ 920 nm)	75 fW/√Hz (@ 1550 nm)
Datasheet	735 kB	738 kB

 

Output voltage ±10 V max (@ 1 MΩ load). Offset adjustable by trimpot. Output short-circuit protected. Threaded M4 and 8-32 mounting holes for use with standard mounting posts. Power supply ±15 V via 3-pin Lemo^® socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet or contact FEMTO.