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Diode-Pumped Solid-State Laser for Teaching Applications

Diode-Pumped Solid-State Laser for Teaching Applications. Aric Lin ECE445 Senior Design. Introduction. Addresses a need for updated teaching equipment for the ECE496 optics laboratory. Provides a modular laser system for the teaching of laser alignment and characterization.

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Diode-Pumped Solid-State Laser for Teaching Applications

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  1. Diode-Pumped Solid-State Laser for Teaching Applications Aric Lin ECE445 Senior Design

  2. Introduction • Addresses a need for updated teaching equipment for the ECE496 optics laboratory. • Provides a modular laser system for the teaching of laser alignment and characterization.

  3. Features/Requirements • Modular design. Components are easily manipulated or replaced. • Ease of use. Designed for beginning ECE496 lab students - alignment should be relatively simple. • Output Specifications: • Output power > 50% manufacturer spec • Lasing wavelength within 1% of manufacturer spec

  4. Hardware Overview • Laser components: • Pump: IR laser diode • Gain Medium: Laser crystal • Cavity: Mirrored surfaces • Optics required for beam correction Pump Gain medium Output Cavity

  5. Laser Crystal • Nd:YO4 crystal + KTP (Potassium-Titanyl-Phosphate) frequency-doubler. • Nd:YO4 is pumped at 808nm, lases at 1064nm, which is halved by the KTP to 532nm – green light. Figure from CASIX, Inc. website: http://www.casix.com

  6. Laser Crystal - Specifications • Reflective coatings: • Incident surface: • R<5% @ 808nm • R>99.8% @ 1064nm • R>99.8% @ 532nm • Output surface • R>99.8% @ 808nm • R>99.8% @ 1064nm • R<5% @ 532nm • Overall dimensions: 1mm x 1.5mm x 2.5mm Figure from CASIX, Inc. website: http://www.casix.com

  7. Crystal Mount • GRIN (Gradient Index) lens holder fixed to a tilt/rotation table mount • Translation stage unnecessary –added degree of complexity in alignment • Tilt alignment generally unnecessary. Can be used to fine-tune crystal alignment to maximize output power. Screw clamp GRIN holder Tilt table

  8. Pump Diode TE Plate • 808nm AlGaAs edge-emitter. • Driven by generic power supply. • Threshold current ~300mA • Thermoelectric cooler w/ ILX temperature controller Heat Sink Laser Diode

  9. Optics • Collimating lens. Lowers beam divergence from ~(45°,5°) to ~(5°,1°). • Focusing lens (focal length ~1cm) • Anamorphic Prism Pair (discarded) • All optics mounted on translation stages – primary means of alignment

  10. Threshold ~330mA @1.7V

  11. Slope efficiency ~28.5%

  12. Threshold ~530mA @1.8V

  13. Slope efficiency ~5.3%

  14. Slope efficiency ~0.9%

  15. Other Characteristics • Pump • Lasing wavelength = 808nm ±0.8nm • FWHM ~4.1nm • Beam divergence = (44.2°, 5.1°)→(5.7°,1.4°) • Crystal • Lasing wavelength = 532nm ±0.3nm • FWHM ~2.8nm • Beam divergence = (0.6°,0.5°)

  16. The Nutshell • DPSS laser in 4 parts: pump, collimating lens, focusing lens, and crystal. • Output power ~70% of manufacturer spec near 200mW of pump power • Lasing wavelength within 0.1% of manufacturer spec • Alignment consists of two translation stages and a tilt stage, if necessary.

  17. Credits • Dr. Peter D. Dragic • Mr. Chad Carlson

  18. Thank You

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