
Laser two-channel automated system with the opportunity of simultaneous generation of Nd:YAG harmonics and the 2nd and the 3rd harmonics of Ti:Sapphire lasers with the line width up to 35 pm in each channel on several wavelengths. Each channel contains pumping Nd:YAG laser, Ti:Sapphire laser and achromatized telescope-expander. This is a special implementation for application in a mobile distant atmosphere monitoring complex as a radiation source. It is notable for the complete diagnostics of radiation parameters in each channel, information transfer via optical fiber, high-temperature resistance and mechanical resistance of the construction.
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With the intensive technological progress, the atmospheric monitoring has become one of the most important issues for the absolute majority of states in their environment protection activity. The given two-laser system (one Ti:Sapphire lasers and one Nd:YAG laser) is designed for application in a mobile distant atmosphere monitoring complex as a radiation source. To determine chlorine, nitrogen dioxide or ozone in the atmosphere the differential method for detection of the second and third harmonics of Ti:Sapphire laser on the set wavelengths in the first channel of laser system is used. Radiation of the second harmonic of Nd:YAG laser in the second channel is used for probing of aerosol formations, and the third harmonic radiation is used as an auxiliary one at chlorine detection.
Features
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| Radiation wavelength: | |
| Channel I | |
| Nd:YAG laser: | 532 nm, 266 nm |
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Ti:Sapphire laser |
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fundamental: |
700 - 950 nm |
| second harmonic: |
350 - 475 nm |
| third harmonic: |
235 - 315 nm |
| Channel II |
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| Nd:YAG laser: |
1064 nm, 355 nm |
| Ti:Sapphire laser |
|
| fundamental: | 700 - 950 nm |
| second harmonic: | 350 - 475 nm |
| third harmonic: | 235 - 315 nm |
| Second linewidth (Ti:Sapphire laser): | 0.025 – 0.040 nm |
| Wavelength stability (during the 8 hours of continuous): | 0.02 nm |
| Beam diameter (in front of the output telescope) | |
| Nd:YAG laser: | ≤ 7.5 mm |
| Ti:Sapphire laser: | ≤ 3.0 mm |
| Energy per pulse (before the output telescope): | |
| 1064 nm: | 650 mJ |
| 532 nm: | 400 mJ |
| 355 nm: | 150 mJ |
| 266 nm: | 120 mJ |
| Ti:Sapphire laser | |
| fundamental: | 75 mJ |
| second harmonic (450 nm): | 30 mJ |
| third harmonic (300 nm): | 10 mJ |
| Beam divergence, max.: | 0.2 mrad |
|
Telescopes: |
8х achromatic |
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Length between optical axises of the channels: |
350 mm |
| Pulse duration (1064 nm): | 12 - 14 ns |
| Pulse repetition rate: | 10 Hz (20 Hz) |
| Pulse energy measurement | |
| measurement range: | 1 - 650 mJ |
| measurement accuracy: | ± 3% |
| Wavelength measurement | |
| measurement range: | 230 - 959 nm |
| measurement accuracy: | |
| 700-950 nm: | 0.04 nm |
| 350-475 nm: | 0.02 nm |
| 235-315 nm: | 0.013 nm |
| Power supply requirements: | one phase, 220В ±20%, 50-60 Hz, 1850 W (max) |
| External synchronization: | TTL level (+5 V) |
| Laser head: | 1500 x 1200 x 250 mm, 385 kg |
| Power supply and cooling system: | 420 x 510 x 1080 mm, 96 kg |