Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the Laser Company Top Sites List. The link will open in a new window for your convenience.

Laser Pointer Store
 Laser Pointers laser crystals bonded with q-switch

LPF Laser Pointer Company Database (link opens new window)

01-11-2017, 10:35 AM #33
 Super Moderator Join Date: Jan 2014 Location: Dohaha, Qatar Posts: 11,372 Rep Power: 21474886
Super Moderator

Join Date: Jan 2014
Location: Dohaha, Qatar
Posts: 11,372
Rep Power: 21474886
Re: laser crystals bonded with q-switch

Not sure I am tracking, what are these little black pieces "8X8X4 and 8X8X5mm with initial T = 10%-14%" ?

__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

01-11-2017, 12:35 PM #34
 Junior Member Join Date: Nov 2016 Posts: 16 Rep Power: 0
op37
Junior Member

Join Date: Nov 2016
Posts: 16
Rep Power: 0
Re: laser crystals bonded with q-switch

This is just Cr:yag crystals....I guess they are for skin treatment machines

01-11-2017, 01:39 PM #35
 Super Moderator Join Date: Jan 2014 Location: Dohaha, Qatar Posts: 11,372 Rep Power: 21474886
Super Moderator

Join Date: Jan 2014
Location: Dohaha, Qatar
Posts: 11,372
Rep Power: 21474886
Re: laser crystals bonded with q-switch

ND:Cr YAG?

From Wikipedia:

Nd:Cr:YAG
YAG doped with neodymium and chromium (Nd:Cr:YAG or Nd/Cr:YAG) has absorption characteristics which are superior to Nd:YAG. This is because energy is absorbed by the broad absorption bands of the Cr3+ dopant and then transferred to Nd3+ by dipole-dipole interactions.[5] This material has been suggested for use in solar-pumped lasers, which could form part of a solar power satellite system.

What wavelength, any idea? I've been googling but it depends if ND:Cr:YAG or some other Cr:YAG. I might want some of those.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

01-12-2017, 02:25 AM #36
 Junior Member Join Date: Nov 2016 Posts: 16 Rep Power: 0
op37
Junior Member

Join Date: Nov 2016
Posts: 16
Rep Power: 0
Re: laser crystals bonded with q-switch

https://shop118323182.taobao.com/cat...BE%A7%CC%E5#bd

01-12-2017, 08:45 AM #37
 Junior Member Join Date: Nov 2016 Posts: 16 Rep Power: 0
op37
Junior Member

Join Date: Nov 2016
Posts: 16
Rep Power: 0
Re: laser crystals bonded with q-switch

The output from Q-switch as two peaks. What might cause the first smaller peak?

01-12-2017, 08:49 AM #38
 Super Moderator Join Date: Jan 2014 Location: Dohaha, Qatar Posts: 11,372 Rep Power: 21474886
Super Moderator

Join Date: Jan 2014
Location: Dohaha, Qatar
Posts: 11,372
Rep Power: 21474886
Re: laser crystals bonded with q-switch

Wish I knew the answer to that. I cannot get that link to work for me, anyone else?
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

01-12-2017, 09:42 AM #39
 Junior Member Join Date: Nov 2016 Posts: 16 Rep Power: 0
op37
Junior Member

Join Date: Nov 2016
Posts: 16
Rep Power: 0
Re: laser crystals bonded with q-switch

OK they sell varies crystals, mirrors, lens, prisms and active Q-sw. I am quoting diffusion bonded crystals from them - for Q-switched DPSS. You could let me know what you want in mind, as I can ask the seller for you. I live in China.

01-12-2017, 10:06 AM #40
 Class 4 Laser Join Date: Jun 2015 Location: Brentwood, England (Near London) Posts: 5,743 Rep Power: 21474862
CurtisOliver
Class 4 Laser

Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 5,743
Rep Power: 21474862
Re: laser crystals bonded with q-switch

Wow, the prices are very good. Is there a minimum quantity to buy, or can you just buy one off?
__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
Jetlasers PLE Pro's

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
Bang Good Home

For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

Which company should I buy from? By Sta

Wavelength to RGB Converter

01-12-2017, 03:12 PM #41
 Class 2M Laser Join Date: May 2009 Posts: 995 Rep Power: 2611997
LSRFAQ
Class 2M Laser

Join Date: May 2009
Posts: 995
Rep Power: 2611997
Re: laser crystals bonded with q-switch

Two pulses, with the first one being small, is probably due to lensing from self adsorption in the CR:YAG. First starts to bleach, then heats up causing lensing, adsorption, diffraction, or scatter, then finally fully bleaches and lases.

It is not uncommon to see poorly designed Q-Switched lasers "ring" with multiple short pulses or fire two or three times if the pump lamp has a long duration or too much energy... If the lamp pulse can still saturate the rod every 250 uSeconds or so, the laser will fire again.

It can also come from issues with the Q-switch holdoff. That multi-pulsing used to cause me all sorts of problems with adjusting drive voltage and intra-cavity polarizer angle alignment on EO Q Switches in the field...

The mode issue suggests problems with thermal lensing, wrong external mirror radius, or you will need a mode limiting aperture intra-cavity... We solved that problem using optics that have a Gaussian reflectivity pattern across the mirror, aka a "Bullseye" coating. I'm not sure you can get those in China yet..

Try shaping your lamp pulse with a small series inductor, which is almost always an air-wound coil say 5-6 cM in diameter with anywhere from three to twenty turns. IF you can adjust the lamp current for "critical damping" with a sharp risetime, you will get optimal power transfer in most cases. In which case you will probably find you need less lamps or less energy. Monitor the lamp with a photodiode, you will learn a lot. (Once you figure out how to keep the PD from saturating in those conditions)

Our systems had up to three flashlamps in series. However, that required "series injecton" triggering using a thyristor, a series inductor, and/ or a shunt diode with return capacitor to keep the trigger pulse out of the storage capacitors.

http://www.orcontech.com/data/Perkin...mp_catalog.pdf

Congrats on getting these lasing, I feared you had bought some expensive paperweights...

Steve
__________________
Career highs and lows:

255 nm to 2100 nm Tunable.
2100 nm to 11 uM tunable.
50 Joules, 700 Picoseconds 1064
32 Joules, 700 pS Green.
Nanosecond, Picosecond, Femtosecond.
HeCad, HeNe, CuBr, Krypton, Argon, N2, Dye, Ti:Saph,
Nd:YLF, Nd: VANDATE, ND:GLASS, OPG, SFM, RAMAN SHIFTED, DFG, OPA,UV Argon Ion, UV and IR (752/799) Krypton Ion
2,3,4th Harmonics of Yag. 13 lines of Mixed Gas, 575 Kr. 690 Kr . 18 lines of HENE. NEW FOR 2016! "Blue OPSL" and Raman Shifted Hene 651 ... New for 2017, Green OPSL, Coming Soon, Yellow OPSL Yet I've flipped Burgers, too.

"I'm from Akron, I know what the Polymers Taste Like"

Last edited by LSRFAQ; 01-12-2017 at 03:25 PM.

01-12-2017, 06:15 PM #42
 Class 3B Laser Join Date: Mar 2013 Location: Colorado, USA Posts: 2,797 Rep Power: 3433735
ultimatekaiser
Class 3B Laser

Join Date: Mar 2013
Posts: 2,797
Rep Power: 3433735
Re: laser crystals bonded with q-switch

Quote:
 Originally Posted by LASERFAQ It is not uncommon to see poorly designed Q-Switched lasers "ring" with multiple short pulses or fire two or three times if the pump lamp has a long duration or too much energy... If the lamp pulse can still saturate the rod every 250 uSeconds or so, the laser will fire again. It can also come from issues with the Q-switch holdoff. That multi-pulsing used to cause me all sorts of problems with adjusting drive voltage and intra-cavity polarizer angle alignment on EO Q Switches in the field...
This was what initially came to mind for me. Thanks for your input Steve...helpful as always.
__________________
Available on Skype and Discord(#3241)
325nm: Omni 2056-M-A01 HeCd
375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473-5
476.5nm: Argon Ion Line

480nm: Coherent Sapphire Custom
483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics Cyan 488-20 DECSL, Coherent Sapphire

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

552nm: Coherent Obis LS
561nm: Melles Griot 85-YCA-015, Coherent Sapphire
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line
611.8nm: Melles Griot LOR-150 HeNe, LOR-006 HeNe

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

01-13-2017, 03:45 AM #43
 Junior Member Join Date: Nov 2016 Posts: 16 Rep Power: 0
op37
Junior Member

Join Date: Nov 2016
Posts: 16
Rep Power: 0
Re: laser crystals bonded with q-switch

Thank you Steve. I just measured the timing of the flash lamps (two lamps with same trigger)...

I am trying to adjust them and will post the results.

I haven't used external mirrors in this experiment. Just with the coatings of both sides of the rod (S1: HT@808, HR@1064; S2: PR=60% @1064)

To CurtisOliver:

I think I need to quote for the prices of items. For now I am quoting for a microchip of (Nd:Yag + Cr:Yag 0.4mm+0.2mm with coating mirrors)

01-21-2017, 12:46 PM #44
 Junior Member Join Date: Nov 2016 Posts: 16 Rep Power: 0
op37
Junior Member

Join Date: Nov 2016
Posts: 16
Rep Power: 0
Re: laser crystals bonded with q-switch

I tuned the schematics and configs. The best result so far was using 4 caps of 240uF/330V each lamp, two caps connected in series to form 120uF/660V caps and two sets of them in parallel. So total caps in each lamp is 240uF/660V. Coil was added in series. It slowed down the rising edge a bit. But no big impact for lamp pulse width. In the following result the coil was not connected. Voltage added was 600V.

Lamp pulse:

Experiment config:

with initial T=60% Cr:Yag rod

with initial T=55% Cr:Yag rod

The beam pattern shot on an undeveloped film:

The transverse mode is still 11.
According to the Lidar equation, the PIN diode sensitivity and distance, the output beam power is estimated to be tens of kW.

Last edited by op37; 01-21-2017 at 12:57 PM.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 08:25 PM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointers - Archive - Top