ABSOLUTE DISTANCE MEASUREMENT BY DUAL COMPACT AND SIMPLE DESIGNED MODE-LOCKED FIBER LASERS |
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| Tze-An Liu, Yi-Chen Chuang, Hau-Wei Lee, Jin-Long Peng |
- Abstract:
- Dual-comb based absolute distance measurement techniques, are attractive because they can scan an entire range window quickly, and requiring no balancing of interferometer paths. We describe a gold coated glass cover plate based dual compact and repetition rate difference tunable free running fiber laser comb based LIDAR (light detection and ranging) system. One end of the laser cavity is butt-coupled with a cover glass plate that coated with 35 nanometers of gold as out coupler, and the other is with a SAM for the mode-locking and high reflection. The difference in repetition rate is tuned to ~1 kHz by a tunable optical delay, providing an experimental update rate of only ~1 ms. The lasers were housed in a box with dimension of 32 cm × 28 cm × 9.5 cm to protect them from air currents and robust handling, but no temperature control or active feedback was used to otherwise stabilize their output. The probe comb is retro-reflected off a pc connector and a movable corner cube to form the measurement path. The measurement precision is 10 µm at the minimum acquisition time of 1 ms, and dropping 400 nm at 400 ms averaging periods from the Allan deviation for the target-to-reference distance at 1.09 m and continuous averaging times up to 0.8 s. The high update rates and 2 m-long ambiguity ranges make this system potentially useful for manufacturing or machining applications where absolute distance measurement is needed.
- Keywords:
- distance measurement, fiber laser, mode-locked
- Download:
- IMEKO-TC14-2014-20.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC14
- Event name:
- TC14 LMPMI Symposium 2014
- Title:
11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry
- Place:
- Tsukuba, JAPAN
- Time:
- 03 September 2014 - 05 September 2014