LSA
Laser Spectrum Analyzer
The LSA utilizes an echelle grating and a low order grating in two separate beam paths. The echelle grating provides the LSA with its high resolving power, enabling high accuracy measurements. The low order grating makes it possible to overcome the wavelength indeterminancy of the echelle grating.
Linewidth Measurement
Our OSAs always include the linewidth option automatically. The linewidth can be determined through multiple calculation methods (please contact us for details), and we can accomodate a wide range of customer requests regarding the algorithms used.
Available Measurement Ranges
LSA 2R
VIS
330 – 1180 nm
LSA
Standard
330 – 1180 nm
UV-I
248 – 1180 nm
UV-II
192 – 800 nm
UV-II/ VIS
192 – 1180 nm
LSA
VIS /IR-I
330 – 1750 nm
IR-II 1)
IR: 1000 – 2250 nm + VIS: 500 – 1000 nm
IR-III 2)
1400 – 11000 nm
Absolute Accuracy 3)
LSA 2R
330 – 420 nm
2 pm
420 – 1180 nm
3 GHz
LSA Standard /UV
192 – 330 nm 4)
6 pm
330 – 420 nm
3 pm
420 – 1180 nm
6 GHz
Quick coupling accuracy 4)
20 GHz
LSA VIS /IR-I
VIS: 330 – 420 nm
6 pm
VIS:
420 – 1060 nm 6 GHz
IR-I:
1060 – 1750 nm 25 GHz
LSA IR-II
IR-II:
1000 – 2250 nm 25 GHz
VIS:
500 – 1000 nm 60 GHz
LSA IR-III
1 – 5 nm
1) Measurements in the range from 500 – 1000 nm are possible but with limitted absolute accuracy as specified.
2) For further information on IR-III devices see the LSA IR-III series datasheet.
3) According to 3σ criterion.
4) With 50 µm multi mode fiber.
Wavelength Deviation Sensitivity/Measurement Resolution
LSA 2R
330 – 420 nm
1 pm
420 – 1180 nm
1.5 GHz
LSA Standard /UV
192 – 330 nm 4)
5 pm
330 – 420 nm
3 pm
420 – 1180 nm
3 GHz
LSA VIS /IR-I
VIS: 330 – 420 nm
3 pm
VIS: 420 – 1060 nm
6 GHz
IR-I: 1060 – 1750 nm
12 GHz
LSA IR-II IR-II: 1000 – 2250 nm
12 GHz
VIS: 500 – 1000 nm
30 GHz
LSA IR-III
0.7 × 10-4 – 2.5 × 10-4 2)
Resolving Power and
Spectral Resolution
Use of singlemode fiber
Use of multimode fiber 6)
Resolving Power (λ/Δλ) 5)
| Spectral resolution Δλ @1000 nm
Resolving Power (λ/Δλ)
LSA 2R
40000
| 0.025 nm
20000
LSA Standard /UV
20000
| 0.05 nm
10000
LSA VIS /IR-I
VIS: 330 – 1060 nm
20000
| 0.05 nm
10000
IR-I: 1060 – 1750 nm
4000
| 0.25 nm
2000
LSA IR-II
IR-II: 1000 – 2250 nm
2800
| 0.36 nm
2000
VIS: 500 – 1000 nm
2000
| 0.5 nm
1000
LSA IR-III
| 15 – 30 nm in the IR-III range
—
2) For further information on IR-III devices see the LSA IR-III series datasheet.
4) With 50 µm multi mode fiber.
5) Spectral resolution Δλ = λ / R; R = resolving power. Assuming that two features are resolved if they are separated by more than the FWHM of the instrument response function.
6) Please use 50 µm MM fibers. Please do not use fibers with core diameter > 50 µm.
Linewidth Measurement Accuracy 7)
LSA 2R
4 GHz
LSA Standard /UV
7 GHz
LSA VIS /IR-I
VIS: 330 – 420 nnm
3 pm
VIS: 420 – 1060 nm
7 GHz
IR-I: 1060 – 1750 nm
40 GHz
LSA IR-II
IR-II: 1000 – 2250 nm
60 GHz
VIS: 500 – 1000 nm
70 GHz
LSA IR-III
15 % (≥ 200 GHz)
Maximum Linewidth
LSA 2R
0.6 THz (FWHM)
LSA Standard /UV, LSA VIS /IR-I, LSA IR-II
1.5 THz (FWHM)
LSA IR-III
1 THz (FWHM)
Customization to measure broader sources on request.
Measurement Speed 8)
LSA Standard /UV, LSA VIS /IR-I, LSA IR-II
Data Acquisition
500 Hz
Wavelength and spectrum calculation
300 Hz
Wavelength and spectrum calculation with live display
100 Hz
LSA IR-III
Wavelength and spectrum calculation
100 Hz
Wavelength and spectrum calculation with live display
100 Hz
7) With the use of singlemode fibers. But not better than 5 % of the linewidth.
8) Depending on PC hardware and settings. Without autocalibration usage.
Required Input Energy and Power 9)
LSA Standard, LSA 2R
0.0001 – 0.04 µJ (or µW)
LSA UV-I, LSA UV-II, LSA UV-II/VIS
0.0001 – 0.1 µJ (or µW)
LSA VIS /IR-I
VIS: 330 – 1060 nm
0.0001 – 0.04 µJ
IR-I: 1060 – 1750 nm
0.02 – 2 µJ
LSA IR-II
0.02 – 2 µJ
LSA IR-III
10 µJ / 1 mW
Diffraction Grating, Free Spectral Range 10)
LSA 2R
2.3 THz
LSA Standard /UV, LSA VIS /IR-I, LSA IR-II
~5.4 THz
LSA IR-III
2.7 THz
Coupling Fiber and Connector
Single mode fiber set, 50 µm MM fiber
Use of single mode fiber recommended
FC/PC connector at the spectrometer required
Calibration
LSA Standard /UV, LSA VIS /IR-I Internal calibration source , calibration period ≤ 1 month
LSA IR-II and IR-III External calibration source 11), calibration period ≤ 15 days
Warm-up Time
No warm-up time under constant ambient conditions. Otherwise until thermal and air pressure equilibrium is reached
9) The cw power interpretation in [μW] compares to an exposure of 1s (generally the energy needs to be divided by the exposure time to obtain the required power).
10) Custom FSR on request.
11) e.g. SLR-1532.
Dimensions L × W × H
325 × 180 × 77 mm
Weight
2.8 kg
Interface
High-speed USB 2.0 connection
Power Supply
Power consumption < 2.3 W, supply directly via USB cable; LSA IR-II & IR-III: external power supply included
商品属性 [波长范围] 330 – 1180 nm