Raman Spectrometer 532/785/1064nm
Standard Spectrometer 200-1100nm
High Sensitivity UV Enhanced Spectrometer
BSI Cooled High Sensitivity Spectrometers
Large NA High QE Spectrometer 200-1450nm
Near Infrared Spectrometer 900-2500nm
More
Auto-Fluorescence Microscope
Confocal Raman Microscope
Spinning Disk Confocal Microscope
Industry Line Scan Confocal Microscope
Research Line Scan Confocal Microscope
Laser Point Scanning Confocal Microscope
TCSPC System for SPAD (APD) Testing
Maskless Lithography UV Laser Writer
Laser Doppler Vibrometer 0.1Hz to 5Mhz
OCT Imaging System
NEW Product
X-ray/XRD Heating & Cryo Stage
Optical Heating & Cryo Stage
Electrical Probe Temperature Stage
Adjustable Electrical Probe Station
Tensile Strain Temperature Stage
Fiber Spectrometers (200nm to 5um)
X-Ray/XUV/VUV Spectrometers (1-300nm)
FT Infrared Spectrometer(900-16000nm)
Hyperspectral Camera (220nm-4.2μm)
Monochromator & Spectrograph
Single Photon Detector (SPD)(200-1700nm)
Photomultiplier Tubes (PMT)(160-900nm)
Photodiode Detector (PD) (200nm-12um)
Pyroelectric Infrared Detectors (2-12um)
Single-Photon Avalanche Diode Array
IR Beam Profiler
Terahertz Beam Profiler
Scanning Slit Beam Profiler
UV-VIS Beam Profiler（190-1100nm）
Infrared Beam Profiler（350-1750nm）
Compact Beam Profiler（190-1100nm）
Photodiode Power Sensors 250-2500nm
Power Meter Console
Integrating Spheres (10mm-100mm)
Power Meter Adaptor & Accessories
Thermoelectric laser power meter(0.19-25 μm)
Photoelectric laser power meter(200-1100nm)
VUV/UV Spectrograph
1/8m Monochromator/Spectrograph
1/2m&1/4m Monochromator/Spectrograph
Monochromator Accessories
LIV Test Systems for Laser Diode / LED
White Light Interferometer
Optical Coating CRD Reflectrometer
Optical Test Measurement System
RF Test Measurement System
CW Pigtail Laser Diode (400-1920nm)
CW Laser Diode Module (375-785nm)
CW Multi Wavelength Laser
DPSS Nanosecond Pulsed Lasers
DFB/FP Picosecond Laser (370-1550nm)
High-Power Femtosecond Solid-State Lasers
Nanosecond Pulse Fiber Laser(1064-2um)
Picosecond Pulse Fiber Laser (515nm - 2um)
Femtosecond Pulse Fiber Laser 780nm-2um
CW Fiber Laser System (405nm - 2um)
CW Narrow Linewidth Lasers (1530nm-2um)
C-Band Tunable Laser (1529 -1567nm)
L-Band Tunable Laser (1554 -1607nm)
Supercontinuum Fiber Lasers 450-2300nm
Short-pulse OPA (650 - 2600nm)
Femtosecond OPA (650 - 2600nm)
Broadband Femtosecond Laser 950-1150nm
Erbium Doped Fiber Amplifier
Ytterbium Doped Fiber Amplifier
Thulium-Doped Fiber Amplifier
Fiber Raman Amplifier
Semiconductor Optical Amplifier
EUV Light Sources(58-130nm)
VUV Light Sources(115-130nm)
ASE Light Sources (830-2000nm)
Microscopy Imaging LED Sources 360-780nm
Collimated LED Sources (240-980nm)
Fiber-Coupled LED Sources (265-940 nm)
Light Field Sythesizer
Hollow-Core Fiber Compressor
High Powered Hollow-Core Fiber Compressor
Ultra-High Contrast 3rd-Order Autocorrelator
Coherent Ultrabroadband XUV Light Source
Enhanced Cavities for Laser Light
Terahertz Quantum Cascade Lasers(1-4.5Thz)
CW IR Quantum Cascade Lasers(3-12μm)
CW LWIR Quantum Cascade Lasers (4-17um)
Fluorescence Upright / Inverted Microscope
Biological Upright / Inverted Microscope
Phase Contrast Microscope
Dark Field Microscope
Polarizing Microscope
Metallographic Upright / Inverted Microscope
Smart 3D Stereo Microscope
USB Digital Microscope With Platform
Built-in Digital Microscope
Plan Apochromatic Objective
Industrial Plan Objective
Biology Plan Objective
Microscope CCD Camera (VIS-NIR）
Microscope CMOS Camera (UV-NIR)
UV & NIR Enhanced CMOS Camera
Hyperspectral Camera for Microscope
Multispectral Camera For Microscope
Microscope Light & Lamp
Soft X-Ray BSI sCMOS Camera (80-1000eV)
UV-NIR sCMOS Camera (200-1100nm)
Intensified CMOS Camera (200-1100nm)
Imaging Intensifier Tube
Full Frame CCD Camera for UV VIS NIR
Full Frame CCD Camera for VUV EUV X-ray
Full Frame In-vacuum CCD Cameras
Large Format In-vacuum CCD Cameras
HDMI Color CMOS Camera (Monitor)
High Speed Line Scan Camera
Large Format Camera
High Speed Large Format Camera
Frame Grabber
Infrared Pyrometers (-40-3000C)
Infrared linear Array Camera
Infrared Matrix Array Cameras
Blackbody Calibration Sources -15 to 1500°C
Short-Wave Infrared Camera (SWIR)
Mid-Wave Infrared Camera (MWIR)
Long-Wave Infrared Camera (LWIR)
Solar Blind UV Imaging Module 240-280nm
UV-VIS Online Monitoring Module
UV-VIS Dual Channel Camera
UV-VIS-IR Triple Spectral Fusion Camera
Ultraviolet Camera for Drone
Free Space Acousto-Optic Modulators (AOM)
Fiber Coupled Acousto-Optic Modulators
Free Space Acousto-Optic Tunable Filter
Fiber-coupled Acousto-optic Tunable Filter
Acousto-Optic Q-switch (AOQ)
Acousto-Optic Frequency Shift (AOFS)
Electro-optical Amplitude Modulator
Electro-optic Phase Modulator
Ultra-fast Pulse Generator for TCSPC
Single-photon time counter
ID1000 Timing Controller
Phase Spatial Light Modulator
Transmission Amplitude SLM
Reflection Amplitude SLM
Digital Micromirror SLM
Pulsed Voltage
Pulsed Current
General Purpose Pulse Generators
Medium and High Voltage Pulse Generators
High Speed Impulse Generator
Very High Speed Pulse Generators
Function Generators
Pulse Amplifiers
Single-channel Lock-in Amplifier
Dual-channel Lock-in Amplifier
TPX / HDPE Terahertz Plano Convex Lens
Off-Axis Parabolic Mirrors
Terahertz Hollow Retro Reflector
Terahertz Metallic Mirrors
ZnTe / GaSe Terahertz Crystals
Terahertz Beam Expander Reflection
Waveplates
Optical Isolator
Optical Polarizers
Beamsplitter Plate
Beamsplitter Cube
Dichroic Beamsplitters
Ultrathin Beamsplitter Plate
Bandpass Filters Fluorescence Microscope
Filters for Raman Spectroscopy
Narrow Filters for Laser
Filters for FISH
Filters for TIRF Microscope
Filters for FRET Microscope
Laser Crystals
Nonlinear Optical Crystals
Birefringent Crystals
Optical Crystals
Electro-optical Crystals
Micro-Channel Plate (MCP)
Micro-Channel Plate Assembly (MCP)
Fiber Optic Plates (FOP)
Micro Pore Optics
X-Ray Collimators
Hybrid Fiber Components
Electrically Adjustable Optical Delay Line
Manually Adjustable Optic Delay Line
Optical Circulator
Filter Coupler
FA Lens
Zoom Lens
Telecentric Lens Series
In-situ Tensile Heating & Cryo Stage
Single Axis Motorized Piezo Stage
XY Motorized Piezo Stages
Multi Axis Motorized Piezo Stages
Vacuum Non-magnetic Piezo Stage
Nano Electric Actuator
XY Stepper Motor Stages
XYZ 3 Axis Stepper Motor Stages
XY Microscope Piezo Stages
XY Microscope Linear Motor Stages
Motorized Filter Wheel
FWR Motorized filter wheels
13mm Linear Stages
25mm Linear Stages
Rotation and Tilt Stages
Rack and Pinion Stages
Vertical Axis Stages
2-Axis Stages
Solid Vibration Isolation Optical Table
Solid Vibration Isolation Table
Pneumatic Optical table
Pneumatic Optical Table With Pendulum Rod
Honeycomb Optical Breadboard
Lens Mounts
Mirror Mounts
Filter Mounts
Input Channel:
SIMTRUM'S Dual-channel Lock-in Amplifier detects an input signal in a single-ended mode or a differential voltage mode. With an ultra low-noise pre-amplifier, the input noise is low. Besides, the device can be used for current measurement with gains of 106 or 108 V/A. Two line filters (50/60 Hz and 100/120 Hz) are designed to eliminate power frequency interference. A programmable gain amplifier is used to adjust the dynamic reserve of the system, so that LIA can keep a high dynamic reserve.
Reference Channel:
The reference signal can work in external mode or internal mode. In internal mode, a precise and stable internal oscillator generates sine wave as an internal reference that is multiplied by the input signal. This internal signal is without any phase noise. With the digital phase-shifting technique, the phase resolution of the reference signal can achieve high resolution accuracy. In external mode, the reference signal can be a sine wave or a TTL pulse or a square wave. The rising or falling edge of the external reference signal triggers the Phase Lock Loop (PLL) to lock the external signal. Based on the frequency of the reference signal, LIA can detect the harmonics of the input signal. The maximum harmonic signal frequency can reach 32,767 times the fundamental frequency.
Working Theory
A lock-in amplifier, also known as a phase-sensitive detector, extracts a weak signal buried in noise by using a reference signal to demodulate the input signal, isolating the component at the reference frequency and phase.
Lock-in amplifiers employ phase-sensitive detection, a technique that selectively extracts signal components at a specific frequency and phase. A reference signal, typically a sine wave, is used to demodulate the input signal. The input signal is multiplied with the reference signal. The product of the multiplication is then passed through a low-pass filter, which allows the low-frequency components (representing the signal) to pass through while rejecting the high-frequency components (representing the noise).
If the input signal and the reference signal are correlated (i.e., they have the same frequency and phase), their multiplication will result in a low-frequency signal that is not averaged to zero by the low-pass filter. Noise, which is random and uncorrelated with the reference signal, will result in a high-frequency signal that is averaged to zero by the low-pass filter.
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Light Analysis
Microscope
Light Sources
Imaging
Optics