FPAS Mid-Infrared Array Spectrometer

Femtosecond Pulse Acquisition Spectrometer: a turn-key high-speed mid-infrared (MWIR) array spectrometer for ultrafast spectroscopy, femtosecond pump-probe, transient absorption, and 2D IR vibrational spectroscopy.

System Overview

Drop-In Femtosecond Spectroscopy

The FPAS spectrograph provides a turn-key, drop-in solution for femtosecond Pump-Probe 2D Vibrational Spectroscopy. All required components are provided, including a host computer and LabView based LASPEC software. Simply focus the laser energy into the entrance slit and start acquiring data. Infrared Systems Development Corporation has teamed with the J.Y. Horiba Company to integrate a high resolution spectrometer with detector and acquisition electronics to provide an easy to use system for complete spectral acquisition. Interchangeable grating turrets allow complete coverage of the mid and long wave infrared bands. All components of the spectrometer and data acquisition system are controlled by the supplied LASPEC software. The open architecture and supplied source code provide the user with unlimited ability to integrate all computer controlled assets with one application.

The FPAS Spectrometer is the most compact imaging spectrometer available. Offering interchangeable triple grating turrets, automated dual exit port selection and motorized slit and grating positioning. Array and detector exit ports are selected by a motorized flip mirror. Many users have collected data with their single element detectors and need a method to correlate the previous data with new data acquired with the Array.

Our Femto-Second Laser Pulse Acquisition System is the heart of the data acquisition system, providing simultaneous sampling of all array elements and external user-provided inputs. The FPAS integrates and captures detector signals from short pulse, high-energy laser systems with excellent linearity and 16-Bit resolution from single pulses or up to 1x10E6 pulses in sequence, with no lost data.

Coupled with a high performance Infrared Associates Linear MCT Array, the system provides unmatched spectral performance. Dual row detector arrays can be used to provide isolated reference and sample paths through the spectrometer to compensate for variations in amplitude and energy distribution typically associates with ultra-short pulse lasers.

3–10

Standard spectral range (µm)

16-bit

ADC resolution

125 kHz

Max laser rep. rate

1×10⁶

Sequential spectra, no lost data

Key Features

✓ 3–10 µm standard range (1–20 µm available)
✓ 6.2 nm standard resolution (3.1 nm optional)
✓ DC – 125 kHz laser repetition rate, no lost data
✓ Integrated LabVIEW LASPEC software with open source code
✓ Simultaneous sampling of all array elements
✓ Dual-row arrays for isolated reference and sample paths

Technical Data

Specifications

Spectrometer

Type	Corrected Cross Czerny-Turner, On-Axis Grating
Focal Length	0.32 meters
Entrance Aperture	F/4.1, 15°
Entrance Slit	Motorized 0–2 mm in 2 µm steps (0.25 mm nominal)
Exit Slit	Motorized 0–2 mm in 2 µm steps
Exit Ports	Array and single element, motorized flip mirror
Flat Image Field	30 mm H × 12 mm V – Array port
Gratings (std.)	150 g/mm @ 5 µm, 75 g/mm @ 5 µm, 50 g/mm @ 6 µm (50–1200 g/mm available), 50×50 mm
Max Resolution	0.35 nm with 1200 g/mm grating

Acquisition System

Laser Rep. Rate	Single shot to 125 kHz
Resolution	16-bit
Spectral Acq. Rate	Single to 1,900 spectra/sec
Max Sequential Spectra	Typically 1×10⁶ (RAM limited)
Communications	10–20 MHz digital port; PC-USB spectrometer control
Standard Detector	liquid nitrogen-cooled MCT Array, 64-element, 0.2 mm W × 0.5 mm H (sourced on customer behalf)
Array Length	16 mm (128-element available)
Software	LabVIEW LASPEC (open-architecture, source included)

Standard Spectral Range & Dispersion

Grating	Spectral Range	Bandwidth	Dispersion
150 g/mm	3–9 µm	0.40 µm	6.2 nm/pixel
75 g/mm	4–10 µm	0.80 µm	12.4 nm/pixel
50 g/mm	3–9 µm	1.2 µm	18.6 nm/pixel

A complete offering of gratings and detectors can meet any application for high-speed pulse acquisition spectrometry. Our customer support team has experience with many techniques and is ready to assist with hardware and software support and modifications to suit your need.

Available Configurations

FPAS Array Integrator Models

All FPAS models share the same core acquisition specs: 1 fs – 2 µs laser pulse width, 0.5–20 µm wavelength range, boxcar integration (50 ns – 5.1 µs), >50,000:1 SNR, <1.5 nV/√Hz total noise, 16-bit resolution, and include a Windows PC with LabVIEW LASPEC software.

FPAS-3216

32-Channel Array Integrator

Channels32 (single row)

External Inputs16

Detector TypesPV/PC MCT, InSb, Si, InGaAs

PowerInternal supply

FPAS-6416

64-Channel Array Integrator

Channels64 (single row)

External Inputs16

Detector TypesPV/PC MCT, InSb, Si, InGaAs

PowerInternal supply

FPAS-6416-D

Dual-Row (2 × 32) Integrator

ChannelsDual rows of 32

External Inputs16

Use CaseIsolated reference & sample paths

Detector TypesPV/PC MCT, InSb, Si, InGaAs

FPAS-0144

128-Channel Array Integrator

Channels128 (single row)

External Inputs16

Detector TypesPV/PC MCT, InSb, Si, InGaAs

PowerInternal supply

FPAS-0144-D

Dual-Row (2 × 64) Integrator

ChannelsDual rows of 64

External Inputs16

Use CaseIsolated reference & sample paths

Detector TypesPV/PC MCT, InSb, Si, InGaAs

Ready to Configure Your FPAS System?

All FPAS models include a Windows PC and LaSpecMX software. Contact our engineers to discuss detector selection, spectral range, and channel count for your application.

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