PD-LD improves high-power lasers by using Volume Bragg Gratings to lock the emission wavelength of high-power multimode laser diodes
June 19, 2003
PENNINGTON, N.J. -- PD-LD Inc. has recently demonstrated a new and exclusive technology for greatly improving characteristics of high power laser diodes by using proprietary Volume Bragg Gratings [VBG™] to lock the emission wavelength of high power multimode laser diodes. The following table illustrates the improvements in emission characteristics by comparing VBG™ locked with typical commercial high power laser diodes:
Table 1:
Diode laser | FWHM | lc control | Dl/dT |
Commercial diodes | 3 � 6 nm | +/- 3 nm | 0.3 nm/�C |
Com. Diode +VBG | <0.5 nm | +/- 0.5 nm | 0.01 nm/�C |
The above comparison shows quite clearly that VBG™ wave locking transforms the multimode high power laser diodes into practically single frequency emitters with precisely defined lc and a very low sensitivity to temperature changes. This, no doubt, will have important consequences for many applications, such as:
High-efficiency pumping solid state lasers
Extension of diode pumping to new kinds of lasers (e.g. disc lasers), where precisely defined pumping wavelength is required
Extension of the life time of the diode pump bars by reducing or even eliminating the so called “red shift” caused by the aging of laser diodes
Sensing, chemical analysis and possibly some medical applications, where the control of the central wavelength is important
Spin-exchange optical pumping for hyperpolarizing the noble gases
VBG™ wave locking is applicable to any wavelength and power level. The method can be used with single emitters as well as with linear arrays and multi-array stacks of high power laser diodes.
Dr. Vladimir S. Ban, CEO says “this is a new direction for our company that we feel will truly make a difference in high power laser yields and improve the efficiency of DPSS high power laser systems.”
PD-LD Inc.
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