Just need to ensure that the circuit that regulates the EL6204 output pin voltage will source or sink at least twice the typical output dc offset current of the EL6204 to provide some margin for chip to chip variations.

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As I understood it from amateur holography sites, a DPSS laser has a long coherence length. Long time ago I posted a link to a test that reached beyond 10 meters (?)

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A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

Making the current source adjustable to suit the diode and whilst maintaining low noise and drift isn't a low cost exercise.

Rather than placing everything in an oven its generally cheaper to start with low noise low drift components such as an LTZ1000 super zener reference plus high stability wire wound resistors etc.

Achieving a linewidth of a few tens of MHz with a FP diode laser requires that a very low noise current source be used to drive the laser or the linewidth can easily be increased to several GHz (corresponding coherence length is a few cm) due to noise current modulation of the laser output frequency. Achieving a low noise low drift current source is not a trivial exercise nor is it inexpensive.

Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

Just need to ensure that the circuit that regulates the EL6204 output pin voltage will source or sink at least twice the typical output dc offset current of the EL6204 to provide some margin for chip to chip variations.

Achieving a linewidth of a few tens of MHz with a FP diode laser requires that a very low noise current source be used to drive the laser or the linewidth can easily be increased to several GHz (corresponding coherence length is a few cm) due to noise current modulation of the laser output frequency. Achieving a low noise low drift current source is not a trivial exercise nor is it inexpensive.

Some diodes perform better than others. Achieving a coherence length of 10m or more is unlikely without feedback from an external cavity when using a standard FP laser diode. A cavity with a cateye coupler and a tilt tuned bandpass (a few nm) filter is more stable than most alternatives, Coherence lengths of hundreds of kilometers are achievable if the ECDL is locked to an atomic transition.

Making the current source adjustable to suit the diode and whilst maintaining low noise and drift isn't a low cost exercise.

Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

Achieving a linewidth of a few tens of MHz with a FP diode laser requires that a very low noise current source be used to drive the laser or the linewidth can easily be increased to several GHz (corresponding coherence length is a few cm) due to noise current modulation of the laser output frequency. Achieving a low noise low drift current source is not a trivial exercise nor is it inexpensive.

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A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

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Alternatively one can use drift and vibration to phase shift between exposures and select a set of suitable exposures with the desired phase shift sequence. This has been done successfully with 40m OPDs. The only requirement is that the effects of drift and vibration are very small during an exposure (typically < 1millisec). In other words a coherence length of several meters need only be maintained for a millisec or so. the real issue is adjusting the current so that the laser diode doesnt mode hop to rapidly. It will usually be necessary to adjust the diode current and/or temperature periodically.

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Making the current source adjustable to suit the diode and whilst maintaining low noise and drift isn't a low cost exercise.

I've done Spice simulations of the action of the RF modulator chip when ac coupled to the laser diode including transient and noise to check the diode current noise and transients on startup and shut down.

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A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

Alternatively one can use drift and vibration to phase shift between exposures and select a set of suitable exposures with the desired phase shift sequence. This has been done successfully with 40m OPDs. The only requirement is that the effects of drift and vibration are very small during an exposure (typically < 1millisec). In other words a coherence length of several meters need only be maintained for a millisec or so. the real issue is adjusting the current so that the laser diode doesnt mode hop to rapidly. It will usually be necessary to adjust the diode current and/or temperature periodically.

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Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

Its easy enough to use an LT3042 to regulate the current of a laser diode with very low noise from 1Hz to 10MHz but its tempco isn't exceptionally low nor is its long term drift.

Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

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Just need to ensure that the circuit that regulates the EL6204 output pin voltage will source or sink at least twice the typical output dc offset current of the EL6204 to provide some margin for chip to chip variations.

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A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

Just need to ensure that the circuit that regulates the EL6204 output pin voltage will source or sink at least twice the typical output dc offset current of the EL6204 to provide some margin for chip to chip variations.

Th laser used in a LUPI only needs to have slow enough drift that the phase drift between exposures for the duration of a PSI frame (4 or more sequential exposures) is very low (a few milliradians at most), For sequential PSI this may be for 1/10 of a second at 50 exposures/sec. With instantaneous PSI  milliradian stability may only be required for a few tens of microseconds.

As I understood it from amateur holography sites, a DPSS laser has a long coherence length. Long time ago I posted a link to a test that reached beyond 10 meters (?)

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I've done Spice simulations of the action of the RF modulator chip when ac coupled to the laser diode including transient and noise to check the diode current noise and transients on startup and shut down.

Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

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Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

Rather than placing everything in an oven its generally cheaper to start with low noise low drift components such as an LTZ1000 super zener reference plus high stability wire wound resistors etc.

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Making the current source adjustable to suit the diode and whilst maintaining low noise and drift isn't a low cost exercise.

Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

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Achieving a linewidth of a few tens of MHz with a FP diode laser requires that a very low noise current source be used to drive the laser or the linewidth can easily be increased to several GHz (corresponding coherence length is a few cm) due to noise current modulation of the laser output frequency. Achieving a low noise low drift current source is not a trivial exercise nor is it inexpensive.

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A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

Either locking to a stable optical cavity using the Pound Drever Hall technique or locking to an atomic resonance is required for long term stability when the stability of the current source is inadequate.

Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

Achieving a linewidth of a few tens of MHz with a FP diode laser requires that a very low noise current source be used to drive the laser or the linewidth can easily be increased to several GHz (corresponding coherence length is a few cm) due to noise current modulation of the laser output frequency. Achieving a low noise low drift current source is not a trivial exercise nor is it inexpensive.

Achieving a linewidth of a few tens of MHz with a FP diode laser requires that a very low noise current source be used to drive the laser or the linewidth can easily be increased to several GHz (corresponding coherence length is a few cm) due to noise current modulation of the laser output frequency. Achieving a low noise low drift current source is not a trivial exercise nor is it inexpensive.

I have not setup an IF or spectrometer to test this, but I can confirm that my green 532nm DPSS laser pointer has a coherence length of ~1cm because I can easily create interference fringes with my thick window glas. I doubt that 10m is possible without precise temperature and very low noise current control. There are home brew control circuits available for this in the holography community (http://hololaser.kwaoo.me/laser/red_diodelasers.html)

Stabilising the temperature and current of the diode will merely, if suitably chosen current and temperature are used, ensure that mode hopping doesn't occur. Typically the diode longitudinal  modes have a spacing of around 0.3nm.

Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

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Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

Its easy enough to use an LT3042 to regulate the current of a laser diode with very low noise from 1Hz to 10MHz but its tempco isn't exceptionally low nor is its long term drift.

Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

I've done Spice simulations of the action of the RF modulator chip when ac coupled to the laser diode including transient and noise to check the diode current noise and transients on startup and shut down.

A typical diode laser has a fwhm (full width half maximum) fast line width of 20MHz or so corresponding to a coherence length of around 15m. Whereas an ECDL can easily have a fast linewidth of 40kHz or so corresponding to a coherence length of around 7.5km.

Its easy enough to use an LT3042 to regulate the current of a laser diode with very low noise from 1Hz to 10MHz but its tempco isn't exceptionally low nor is its long term drift.

Th laser used in a LUPI only needs to have slow enough drift that the phase drift between exposures for the duration of a PSI frame (4 or more sequential exposures) is very low (a few milliradians at most), For sequential PSI this may be for 1/10 of a second at 50 exposures/sec. With instantaneous PSI  milliradian stability may only be required for a few tens of microseconds.

Either locking to a stable optical cavity using the Pound Drever Hall technique or locking to an atomic resonance is required for long term stability when the stability of the current source is inadequate.

Its easy enough to use an LT3042 to regulate the current of a laser diode with very low noise from 1Hz to 10MHz but its tempco isn't exceptionally low nor is its long term drift.

Quantum mechanics imposes a finite laser line width (The Schawlow-Townes-Henry limit) that depends on the cavity length. For short cavities the line width is proportional to the inverse square of the cavity length.

I've done Spice simulations of the action of the RF modulator chip when ac coupled to the laser diode including transient and noise to check the diode current noise and transients on startup and shut down.