[Required Specs for Tunable CW 532 nm laser, RDH.1142]{.underline}

NOTE: This laser is part of mission critical ground-support equipment
(GSE) for the CALIPSO (PICASSO) spaceflight project. It is extremely
important that this procurement be done as expediently as possible.

The following specs are for a diode-pumped, tunable, CW dual-wavelength
solid-state frequency-doubled Nd:YAG laser:

Frequency doubling shall be done non-resonantly. In other words, the
frequency doubling crystal shall be a single-pass or double-pass
doubling crystal, rather than being placed in a resonant cavity.

The output emission shall consist of both 532 nm and 1064 nm
wavelengths, in separate beams.

The output emission for both 532 nm and 1064 nm beams shall be linearly
vertically polarized with a polarization extinction ratio greater than
100:1.

The laser output for both 532 nm and 1064 nm shall be a stable,
single-frequency single-longitudinal-mode with a linewidth of less than
1 kilohertz (measured over a 100 millisecond time span).

The wavelength drift of the laser shall be less than 1 MHz per minute.

The output power shall be greater than 50 milliwatts at 532 nm, and
greater than 900 mW at 1064 nm.

The beam quality of both the 532 nm and the 1064 nm beams shall have a
beam quality of m-squared = 1.3 or better. The beam diameter shall be 1
millimeter +/- 0.5 mm.

A power supply including all laser drive electronics and temperature
control electronics shall be included. The size of the controller shall
be less than 40 cm x 35 cm x 15 cm. The size of the laser head shall be
smaller than 35 cm x 15 cm x 13 cm.

The laser wavelength shall be tunable by thermal tuning of the Nd:YAG
crystal. The thermal coefficient of wavelength tuning at 532 nm shall be
greater than 6 GHz per degree Kelvin. The Nd:YAG baseplate temperature
shall be controllable at least over the range of 12-45 degrees C. The
wavelength shall be tunable at rates of 1GHz/sec or faster. The
wavelength shall quasi-continuously tune (including mode hops) from
532.20 nm or lower at the low end, to 532.30 nm or higher at the upper
end. The 532 nm wavelength shall be continuously and monotonically
tunable over 13 GHz, occurring repeatedly over the full tuning range.
Thermal tuning shall be accomplished via a DC voltage applied to a BNC
connector on the instrument. The input DC voltage range required to
thermally tune over the full tuning range shall be less than +/-10
volts.

The instrument shall be able to operate in an environment of 20-30
degrees C.

The output optical power shall be stable to better than 1% when the
laser is tuned to any given wavelength within the tuning range.

The output optical power shall not change by more than 20% when it is
continuously and monotonically tuned over any 13 GHz tuning window
within the tuning range of the laser.

The free-running relative intensity noise of the laser shall be less
than -90 dB per hertz. The instrument shall contain an optional noise
reduction mode which can be turned on or off. The relative intensity
noise of the laser shall be less than -140 dB per hertz when the noise
reduction mode is turned on. When the noise reduction mode is off, the
output power of the Nd:YAG laser shall have the capability of amplitude
modulation by varying the current injected to the pump laser diode. This
shall be done by applying a DC voltage to a BNC connector on the
instrument.

The laser shall be equipped with the circuitry and wiring necessary to
implement piezo-electric fine-tuning of the laser wavelength.

The laser instrument shall have a standard two-pin safety interlock.