1.2.5. Newport Diode Lasers: wanglib.instruments.lasers

Interfaces to New Focus diode laser controllers.

class wanglib.instruments.lasers.velocity6300(bus)

A New Focus Velocity 6300 diode laser controller.

To instantiate, pass an instrument object to the constructor. e.g., for a controller with GPIB address 1, attached to a prologix GPIB controller:

>>> laser = velocity6300(plx.instrument(1, auto=False))

where plx is the prologix object. If you’re using prologix, it’s very important to turn off read-after-write!

To use with RS232, use \r as the termination character. For example:

>>> from wanglib.util import Serial
>>> laser = velocity6300(Serial('/dev/ttyUSB0', baudrate=19200, term_chars='\r'))

busy

is an operation in progress?

current

return current level in the diode (mA)

get_piezo()

Return piezo voltage as % of full-scale.

get_wl()

Get current wavelength of laser (nm)

on

is the laser on or off?

piezo

Return piezo voltage as % of full-scale.

power

return front-facet laser power level (mW)

set_piezo(val)

Set piezo voltage as % of full-scale.

set_wl(val)

Set current wavelength of laser (nm).

Can take a numerical value, or ‘min’ or ‘max’

stop_tracking()

exit track mode to ready mode.

wl

Get current wavelength of laser (nm)

wl_max

max wavelength of this diode

wl_min

min wavelength of this diode

write(cmd)

Issue a command to the laser.

This takes care of two things:

• Formats the command with @ if using RS-232
• Verifies that the laser responds with OK