Photos of Assorted Diode Pumped Solid State Lasers

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Photos of Assorted Diode Pumped Solid State Lasers

These are assorted random (and possibly unidentified) Diode Pumped Solid State (DPSS) lasers, power supplies, and other related tid-bits. Currently there are photos of two complete laser heads, almost certainly of Far East origin. One supplier is Enlight Technologies, Inc.. (I doubt Enlight is actual manufacturer though they may be relatives - the text on their Web site appears to have been written by someone whose native language isn't English!)

20 mW Green DPSS Laser (Gallery) This is a basic 20 mW green DPSS laser. It appears to be the 20 mW (rated) version of the Enlight Technologies PGL-II Series of DPSS lasers.
(The following photos provided courtesy of: Dave (Ws407c@aol.com).)
- View 01 - Overall view of 20 mW laser with cover removed.
- View 02 - Unit lasing showing size comparison with coin.
- View 03 - Closeup showing intracavity power.
- View 04 - Top view showing Nd:YV04 on left, KTP in center, OC on right.
- View 05 - Another a little closer.
- View 06 - Lights out and lasing green.
- View 07 - Another view.
- View 08 - Closeup of connections to laser diode (hidden).
- View 09 - Closeup of Nd:YVO4 crystal.
- View 10 - Yet closer.
- View 11 - Another showing Peltier cooler with its heat sink fins.
- View 12 - Closeup of the collimating lens behind the IR filter, OC is just past the KTP on a separate holder.
- View 13 - Another angle. Can you tell what's changed? :)
- View 14 - Final shot of the green glowing interior.
- View 15 - View of laser with cover in place and driver/TEC controller board.
80 mW Green DPSS Lsser (Gallery) This is an 80 mW green DPSS laser. Its construction is somewhat more sophisticated than the one above with anamorphic prism corrective optics for beam shape and astigmatism to optimize the active mode volume in the lasing crystal. It appears to be the 50 mW (rated) version of the Enlight Technologies MGL Series of DPSS lasers.
For additional details on my efforts to restore this laser to health, see Reconstruction of a 80 mW Green DPSS Laser.
Note that the laser is actually much smaller than it looks in these superb photos. The total length is about 6" (inches) and the cavity itself measures only about 1.2" (W) x 1/2" (H) x 1-5/8" (L).
(The following photos provided courtesy of: Dave (Ws407c@aol.com).)
- View 01 - Top view of 80 mW laser with cover removed.
- View 02 - Powered up.
- View 03 - Closeup 1 (Right to left): Laser diode, collimating lens, beam correction prisms, focusing lens.
- View 04 - Closeup 2: Prisms, fousing lens, Nd:YV04, KTP.
- View 05 - Closeup 3: Focusing lens, KTP, OC.
- View 06 - Closeup view from HR-end.
- View 07 - Closeup view from OC-end.
- View 08 - Close-closeup of laser diode.
- View 09 - Another one. Amazing how much light can originate from a 0.5 or 0.6 mm square laser diode chip. :)
And now, continuing with the dissassembly:
- View 10 - Beam shaping optics on base with almost everything else removed.
- View 11 - Closeup showing Peltier (Thermo Electric) Cooler - TEC.
- View 12 - Cavity viewed from input/YVO4-end.
- View 13 - Cavity viewed from OC-end
- View 14 - Side view of cavity sitting on TEC and heat sink.
- View 15 - Closeup with KTP clamped in position (hidden).
- View 16 - Closeup of Nd:YVO4 crystal.
- View 17 - KTP and YVO4 removed and oh my goodness - they're cracked!
- View 18 - A good KTP (from another laser).
- View 19 - Good KTP sitting in cavity.
- View 20 - After some reassembly, good KTP doing its doubling thing. :)
So, it would appear as though the laser was manufactured with a defective KTP. The YVO4 doesn't look that great either but at least the important central part isn't damaged. This was sort of a junky laser to begin with sloppy machining, wires falling off due to bad soldering, and just overall poor quality workmanship. The only outward sign of the cracked KTP was a misshapened beam. But once the laser was disassembled, the amazing part is how it actually worked in the first place!
LambdaPro 100+ mW Green DPSS Laser Repair (Gallery)
(The following photos and description provided courtesy of: Matthijs Amelink (matthijs27@hotmail.com).)
These pictures are of a LambdaPro (Chinese made) 140 mW green DPSS laser. They show the replacement of the dead (0.8 Watt?) pump diode with a new 1.2 Watt version.
- View 01View of the laser head before surgery.
- View 02 View inside the laser head.
- View 03 View down the barrel.
- View 04 The naken laser with its aluminum barrel removed.
- View 05 White teflon tape wrapped around everything.
- View 06 Removing the white Teflon tape reveals the stack of alu rings holding the optics
- View 07 View of the two lenses. Note that one lens was originally mounted using cardboard and a lot of glue!
- View 08 View of resonator from the OC-end.
- View 09 View of resonator from the pump-end.
- View 10 The dead pump diode.
- View 11 New setup to remount optics after diode replacement.
- View 12 New diode installed in slightly modified mount.
- View 13 Repaired laser lasing again.
- View 14 Lasing again - side view.
- View 15 Laser running like new and with a lot more power.

Photos of Assorted Diode Pumped Solid State Lasers

20 mW Green DPSS Laser

80 mW Green DPSS Laser

LambdaPro 100+ mW Green DPSS Laser Repair