LITE Level 1 Gain Calculation Document

The amplifier gains are computed as follows:

• 355 nm wavelength Effective Amp Gain = 500 x 10**(-dB/20)
• 532 nm wavelength Effective Amp Gain = 500 x 10**(-dB/20)
• 1064 nm wavelength Effective Amp Gain = 2000 x 10**(-dB/20)

The Photo Multiplier Tube (PMT) Gain = 10**beta, where,

beta = a + b*(HV) + c*(HV*HV) + d*(HV*HV*HV).

High Voltage, HV, is always a negative number in this formula. The coefficients, a, b, and c, are given in the following table:

Channel	a	b	c	d
355	-5.5687	-1.5899e-02	-8.5630e-06	-1.8471e-09
532	-4.5957	-1.2511e-02	-5.2399e-06	-8.8527e-10

The Avalanche Photodiode (APD) Gain (1064 channel) is fixed at 75.